/*      $NetBSD: fetch.c,v 1.247 2026/07/06 07:07:00 mlelstv Exp $      */

/*-
 * Copyright (c) 1997-2026 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Luke Mewburn.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Scott Aaron Bamford.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Thomas Klausner.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: fetch.c,v 1.247 2026/07/06 07:07:00 mlelstv Exp $");
#endif /* not lint */

/*
 * FTP User Program -- Command line file retrieval
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>

#include <netinet/in.h>

#include <arpa/ftp.h>
#include <arpa/inet.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>

#include "ssl.h"
#include "ftp_var.h"
#include "uri.h"
#include "version.h"

typedef enum {
        UNKNOWN_URL_T=-1,
        HTTP_URL_T,
        HTTPS_URL_T,
        FTP_URL_T,
        FILE_URL_T,
        CLASSIC_URL_T
} url_t;

struct authinfo {
        char *auth;
        char *user;
        char *pass;
};

struct urlinfo {
        char *host;
        char *port;
        char *path;
        url_t utype;
        in_port_t portnum;
};

struct posinfo {
        off_t rangestart;
        off_t rangeend;
        off_t entitylen;
};

__dead static void      aborthttp(int);
__dead static void      timeouthttp(int);
#ifndef NO_AUTH
static int      auth_url(const char *, char **, const struct authinfo *);
static void     base64_encode(const unsigned char *, size_t, unsigned char *);
#endif
static int      go_fetch(const char *, struct urlinfo *);
static int      fetch_ftp(const char *);
static int      fetch_url(const char *, const char *, char *, char *,
    struct urlinfo *);
static const char *match_token(const char **, const char *);
static int      parse_url(const char *, const char *, struct urlinfo *,
    struct authinfo *, struct urlinfo *);
static void     url_decode(char *);
static void     freeauthinfo(struct authinfo *);
static void     freeurlinfo(struct urlinfo *);

static int      redirect_loop;


#define STRNEQUAL(a,b)  (strncasecmp((a), (b), sizeof((b))-1) == 0)
#define ISLWS(x)        ((x)=='\r' || (x)=='\n' || (x)==' ' || (x)=='\t')
#define SKIPLWS(x)      do { while (ISLWS((*x))) x++; } while (0)


#define ABOUT_URL       "about:"        /* propaganda */
#define FILE_URL        "file://"       /* file URL prefix */
#define FTP_URL         "ftp://"        /* ftp URL prefix */
#define HTTP_URL        "http://"       /* http URL prefix */
#ifdef WITH_SSL
#define HTTPS_URL       "https://"      /* https URL prefix */

#define IS_HTTP_TYPE(urltype) \
        (((urltype) == HTTP_URL_T) || ((urltype) == HTTPS_URL_T))
#else
#define IS_HTTP_TYPE(urltype) \
        ((urltype) == HTTP_URL_T)
#endif

/**
 * fwrite(3) replacement that just uses write(2). Many stdio implementations
 * don't handle interrupts properly and corrupt the output. We are taking
 * alarm interrupts because of the progress bar.
 *
 * Assumes `fp' is pristine with no prior I/O calls on it.
 */
static size_t
maxwrite(const void *buf, size_t size, size_t nmemb, FILE *fp)
{
        const char *p = buf;
        ssize_t nwr = 0;
        ssize_t n;
        int fd = fileno(fp);

        size *= nmemb;  /* assume no overflow */

        while (size > 0) {
                if ((n = write(fd, p, size)) == -1) {
                        switch (errno) {
                        case EINTR:
                        case EAGAIN:
#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
                        case EWOULDBLOCK:
#endif
                                continue;
                        default:
                                return nwr;
                        }
                }
                p += n;
                nwr += n;
                size -= n;
        }
        return nwr;
}

/*
 * Determine if token is the next word in buf (case insensitive).
 * If so, advance buf past the token and any trailing LWS, and
 * return a pointer to the token (in buf).  Otherwise, return NULL.
 * token may be preceded by LWS.
 * token must be followed by LWS or NUL.  (I.e, don't partial match).
 */
static const char *
match_token(const char **buf, const char *token)
{
        const char      *p, *orig;
        size_t          tlen;

        tlen = strlen(token);
        p = *buf;
        SKIPLWS(p);
        orig = p;
        if (strncasecmp(p, token, tlen) != 0)
                return NULL;
        p += tlen;
        if (*p != '\0' && !ISLWS(*p))
                return NULL;
        SKIPLWS(p);
        orig = *buf;
        *buf = p;
        return orig;
}

static void
initposinfo(struct posinfo *pi)
{
        pi->rangestart = pi->rangeend = pi->entitylen = -1;
}

static void
initauthinfo(struct authinfo *ai, char *auth)
{
        ai->auth = auth;
        ai->user = ai->pass = 0;
}

static void
freeauthinfo(struct authinfo *a)
{
        FREEPTR(a->user);
        if (a->pass != NULL)
                memset(a->pass, 0, strlen(a->pass));
        FREEPTR(a->pass);
}

static void
initurlinfo(struct urlinfo *ui)
{
        ui->host = ui->port = ui->path = 0;
        ui->utype = UNKNOWN_URL_T;
        ui->portnum = 0;
}

static void
copyurlinfo(struct urlinfo *dui, struct urlinfo *sui)
{
        dui->host = ftp_strdup(sui->host);
        dui->port = ftp_strdup(sui->port);
        dui->path = ftp_strdup(sui->path);
        dui->utype = sui->utype;
        dui->portnum = sui->portnum;
}

static void
freeurlinfo(struct urlinfo *ui)
{
        FREEPTR(ui->host);
        FREEPTR(ui->port);
        FREEPTR(ui->path);
}

#ifndef NO_AUTH
/*
 * Generate authorization response based on given authentication challenge.
 * Returns -1 if an error occurred, otherwise 0.
 * Sets response to a malloc(3)ed string; caller should free.
 */
static int
auth_url(const char *challenge, char **response, const struct authinfo *auth)
{
        const char      *cp, *ep, *scheme, *errormsg;
        char            *clear, *realm;
        char             uuser[BUFSIZ], *gotpass;
        const char      *upass;
        int              rval;
        size_t           len, clen, rlen;

        *response = NULL;
        clear = realm = NULL;
        rval = -1;
        cp = challenge;
        scheme = "Basic";       /* only support Basic authentication */
        gotpass = NULL;

        DPRINTF("%s: challenge `%s'\n", __func__, challenge);

        if (! match_token(&cp, scheme)) {
                warnx("Unsupported authentication challenge `%s'",
                    challenge);
                goto cleanup_auth_url;
        }

#define REALM "realm=\""
        if (STRNEQUAL(cp, REALM))
                cp += sizeof(REALM) - 1;
        else {
                warnx("Unsupported authentication challenge `%s'",
                    challenge);
                goto cleanup_auth_url;
        }
/* XXX: need to improve quoted-string parsing to support \ quoting, etc. */
        if ((ep = strchr(cp, '\"')) != NULL) {
                len = ep - cp;
                realm = (char *)ftp_malloc(len + 1);
                (void)strlcpy(realm, cp, len + 1);
        } else {
                warnx("Unsupported authentication challenge `%s'",
                    challenge);
                goto cleanup_auth_url;
        }

        fprintf(ttyout, "Username for `%s': ", realm);
        if (auth->user != NULL) {
                (void)strlcpy(uuser, auth->user, sizeof(uuser));
                fprintf(ttyout, "%s\n", uuser);
        } else {
                (void)fflush(ttyout);
                if (get_line(stdin, uuser, sizeof(uuser), &errormsg) < 0) {
                        warnx("%s; can't authenticate", errormsg);
                        goto cleanup_auth_url;
                }
        }
        if (auth->pass != NULL)
                upass = auth->pass;
        else {
                gotpass = getpass("Password: ");
                if (gotpass == NULL) {
                        warnx("Can't read password");
                        goto cleanup_auth_url;
                }
                upass = gotpass;
        }

        clen = strlen(uuser) + strlen(upass) + 2;       /* user + ":" + pass + "\0" */
        clear = (char *)ftp_malloc(clen);
        (void)strlcpy(clear, uuser, clen);
        (void)strlcat(clear, ":", clen);
        (void)strlcat(clear, upass, clen);
        if (gotpass)
                memset(gotpass, 0, strlen(gotpass));

                                                /* scheme + " " + enc + "\0" */
        rlen = strlen(scheme) + 1 + (clen + 2) * 4 / 3 + 1;
        *response = ftp_malloc(rlen);
        (void)strlcpy(*response, scheme, rlen);
        len = strlcat(*response, " ", rlen);
                        /* use  `clen - 1'  to not encode the trailing NUL */
        base64_encode((unsigned char *)clear, clen - 1,
            (unsigned char *)*response + len);
        memset(clear, 0, clen);
        rval = 0;

 cleanup_auth_url:
        FREEPTR(clear);
        FREEPTR(realm);
        return (rval);
}

/*
 * Encode len bytes starting at clear using base64 encoding into encoded,
 * which should be at least ((len + 2) * 4 / 3 + 1) in size.
 */
static void
base64_encode(const unsigned char *clear, size_t len, unsigned char *encoded)
{
        static const unsigned char enc[] =
            "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
        unsigned char   *cp;
        size_t   i;

        cp = encoded;
        for (i = 0; i < len; i += 3) {
                *(cp++) = enc[((clear[i + 0] >> 2))];
                *(cp++) = enc[((clear[i + 0] << 4) & 0x30)
                            | ((clear[i + 1] >> 4) & 0x0f)];
                *(cp++) = enc[((clear[i + 1] << 2) & 0x3c)
                            | ((clear[i + 2] >> 6) & 0x03)];
                *(cp++) = enc[((clear[i + 2]     ) & 0x3f)];
        }
        *cp = '\0';
        while (i-- > len)
                *(--cp) = '=';
}
#endif

/*
 * Decode %xx escapes in given string, `in-place'.
 */
static void
url_decode(char *url)
{
        unsigned char *p, *q;

        if (EMPTYSTRING(url))
                return;
        p = q = (unsigned char *)url;

#define HEXTOINT(x) (x - (isdigit(x) ? '0' : (islower(x) ? 'a' : 'A') - 10))
        while (*p) {
                if (p[0] == '%'
                    && p[1] && isxdigit((unsigned char)p[1])
                    && p[2] && isxdigit((unsigned char)p[2])) {
                        *q++ = HEXTOINT(p[1]) * 16 + HEXTOINT(p[2]);
                        p+=3;
                } else
                        *q++ = *p++;
        }
        *q = '\0';
}

static const char *
get_port(const struct urlinfo *ui)
{

        switch(ui->utype) {
        case HTTP_URL_T:
                return httpport;
        case FTP_URL_T:
                return ftpport;
        case FILE_URL_T:
                return "";
#ifdef WITH_SSL
        case HTTPS_URL_T:
                return httpsport;
#endif
        default:
                return NULL;
        }
}

static int
use_relative(const struct urlinfo *ui)
{
        if (ui == NULL)
                return 0;
        switch (ui->utype) {
        case HTTP_URL_T:
        case FILE_URL_T:
#ifdef WITH_SSL
        case HTTPS_URL_T:
#endif
                return 1;
        default:
                return 0;
        }
}

/*
 * Parse URL of form (per RFC 3986):
 *      <type>://[<user>[:<password>]@]<host>[:<port>][/<path>]
 * Returns -1 if a parse error occurred, otherwise 0.
 * It's the caller's responsibility to url_decode() the returned
 * user, pass and path.
 *
 * Sets type to url_t, each of the given char ** pointers to a
 * malloc(3)ed strings of the relevant section, and port to
 * the number given, or ftpport if ftp://, or httpport if http://.
 *
 * XXX: this is not totally RFC 3986 compliant; <path> will have the
 * leading `/' unless it's an ftp:// URL, as this makes things easier
 * for file:// and http:// URLs.  ftp:// URLs have the `/' between the
 * host and the URL-path removed, but any additional leading slashes
 * in the URL-path are retained (because they imply that we should
 * later do "CWD" with a null argument).
 *
 * Examples:
 *       input URL                       output path
 *       ---------                       -----------
 *      "http://host"                   "/"
 *      "http://host/"                  "/"
 *      "http://host/path"              "/path"
 *      "file://host/dir/file"          "dir/file"
 *      "ftp://host"                    ""
 *      "ftp://host/"                   ""
 *      "ftp://host//"                  "/"
 *      "ftp://host/dir/file"           "dir/file"
 *      "ftp://host//dir/file"          "/dir/file"
 */

static int
parse_url(const char *url, const char *desc, struct urlinfo *ui,
    struct authinfo *auth, struct urlinfo *rui)
{
        const char      *origurl, *tport;
        char            *cp, *ep, *thost;
        size_t           len;

        if (url == NULL || desc == NULL || ui == NULL || auth == NULL)
                errx(1, "parse_url: invoked with NULL argument!");
        DPRINTF("parse_url: %s `%s'\n", desc, url);

        origurl = url;

        if (STRNEQUAL(url, HTTP_URL)) {
                url += sizeof(HTTP_URL) - 1;
                ui->utype = HTTP_URL_T;
                ui->portnum = HTTP_PORT;
        } else if (STRNEQUAL(url, FTP_URL)) {
                url += sizeof(FTP_URL) - 1;
                ui->utype = FTP_URL_T;
                ui->portnum = FTP_PORT;
        } else if (STRNEQUAL(url, FILE_URL)) {
                url += sizeof(FILE_URL) - 1;
                ui->utype = FILE_URL_T;
#ifdef WITH_SSL
        } else if (STRNEQUAL(url, HTTPS_URL)) {
                url += sizeof(HTTPS_URL) - 1;
                ui->utype = HTTPS_URL_T;
                ui->portnum = HTTPS_PORT;
#endif
        } else if (rui != NULL) {
                copyurlinfo(ui, rui);
        } else {
                warnx("Invalid %s `%s'", desc, url);
 cleanup_parse_url:
                freeauthinfo(auth);
                freeurlinfo(ui);
                return (-1);
        }


        if (*url == '\0')
                return (0);

                        /* find [user[:pass]@]host[:port] */
        ep = strchr(url, '/');
        if (ep == NULL)
                thost = ftp_strdup(url);
        else {
                len = ep - url;
                thost = (char *)ftp_malloc(len + 1);
                (void)strlcpy(thost, url, len + 1);
                if (ui->utype == FTP_URL_T)     /* skip first / for ftp URLs */
                        ep++;
                ui->path = ftp_strdup(ep);
        }

        cp = strchr(thost, '@');        /* look for user[:pass]@ in URLs */
        if (cp != NULL) {
                if (ui->utype == FTP_URL_T)
                        anonftp = 0;    /* disable anonftp */
                auth->user = thost;
                *cp = '\0';
                thost = ftp_strdup(cp + 1);
                cp = strchr(auth->user, ':');
                if (cp != NULL) {
                        *cp = '\0';
                        auth->pass = ftp_strdup(cp + 1);
                }
                url_decode(auth->user);
                if (auth->pass)
                        url_decode(auth->pass);
        }

#ifdef INET6
                        /*
                         * Check if thost is an encoded IPv6 address, as per
                         * RFC 3986:
                         *      `[' ipv6-address ']'
                         */
        if (*thost == '[') {
                cp = thost + 1;
                if ((ep = strchr(cp, ']')) == NULL ||
                    (ep[1] != '\0' && ep[1] != ':')) {
                        warnx("Invalid address `%s' in %s `%s'",
                            thost, desc, origurl);
                        goto cleanup_parse_url;
                }
                len = ep - cp;          /* change `[xyz]' -> `xyz' */
                memmove(thost, thost + 1, len);
                thost[len] = '\0';
                if (! isipv6addr(thost)) {
                        warnx("Invalid IPv6 address `%s' in %s `%s'",
                            thost, desc, origurl);
                        goto cleanup_parse_url;
                }
                cp = ep + 1;
                if (*cp == ':')
                        cp++;
                else
                        cp = NULL;
        } else
#endif /* INET6 */
                if ((cp = strchr(thost, ':')) != NULL)
                        *cp++ = '\0';
        if (*thost != '\0')
                ui->host = thost;

                        /* look for [:port] */
        if (cp != NULL) {
                unsigned long   nport;

                nport = strtoul(cp, &ep, 10);
                if (*cp == '\0' || *ep != '\0' ||
                    nport < 1 || nport > MAX_IN_PORT_T) {
                        warnx("Unknown port `%s' in %s `%s'",
                            cp, desc, origurl);
                        goto cleanup_parse_url;
                }
                ui->portnum = (in_port_t)nport;
                tport = cp;
        } else
                tport = get_port(ui);


        if (tport != NULL)
                ui->port = ftp_strdup(tport);
        if (ui->path == NULL) {
                const char *emptypath = "/";
                if (ui->utype == FTP_URL_T)     /* skip first / for ftp URLs */
                        emptypath++;
                ui->path = ftp_strdup(emptypath);
        }

        DPRINTF("%s: user `%s' pass `%s' host %s port %s(%d) "
            "path `%s'\n", __func__,
            STRorNULL(auth->user), STRorNULL(auth->pass),
            STRorNULL(ui->host), STRorNULL(ui->port),
            ui->portnum ? ui->portnum : -1, STRorNULL(ui->path));

        return (0);
}

static sigjmp_buf       httpabort;

static int
ftp_socket(const struct urlinfo *ui, void **ssl, struct authinfo *auth)
{
        struct addrinfo hints, *res, *res0 = NULL;
        int error;
        int s;
        const char *host = ui->host;
        const char *port = ui->port;
        char *fuser = NULL, *pass = NULL, *facct = NULL;
        int n;

        if (ui->utype != HTTPS_URL_T)
                ssl = NULL;

        memset(&hints, 0, sizeof(hints));
        hints.ai_flags = 0;
        hints.ai_family = family;
        hints.ai_socktype = SOCK_STREAM;
        hints.ai_protocol = 0;

        error = getaddrinfo(host, port, &hints, &res0);
        if (error) {
                warnx("Can't LOOKUP `%s:%s': %s", host, port,
                    (error == EAI_SYSTEM) ? strerror(errno)
                                          : gai_strerror(error));
                return -1;
        }

        if (res0->ai_canonname)
                host = res0->ai_canonname;

        s = -1;
        if (ssl)
                *ssl = NULL;
        for (res = res0; res; res = res->ai_next) {
                char    hname[NI_MAXHOST], sname[NI_MAXSERV];

                ai_unmapped(res);
                if (getnameinfo(res->ai_addr, res->ai_addrlen,
                    hname, sizeof(hname), sname, sizeof(sname),
                    NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
                        strlcpy(hname, "?", sizeof(hname));
                        strlcpy(sname, "?", sizeof(sname));
                }

                if (verbose && res0->ai_next) {
#ifdef INET6
                        if(res->ai_family == AF_INET6) {
                                fprintf(ttyout, "Trying [%s]:%s ...\n",
                                    hname, sname);
                        } else {
#endif
                                fprintf(ttyout, "Trying %s:%s ...\n",
                                    hname, sname);
#ifdef INET6
                        }
#endif
                }

                s = socket(res->ai_family, SOCK_STREAM, res->ai_protocol);
                if (s < 0) {
                        warn(
                            "Can't create socket for connection to "
                            "`%s:%s'", hname, sname);
                        continue;
                }

                if (ftp_connect(s, res->ai_addr, res->ai_addrlen,
                    verbose || !res->ai_next) < 0) {
                        close(s);
                        s = -1;
                        continue;
                }

                if (ruserpass("", &fuser, &pass, &facct) < 0) {
                        close(s);
                        s = -1;
                        continue;
                }

                if (autologin) {
                        if (fuser != NULL && auth->user == NULL)
                                auth->user = ftp_strdup(fuser);
                        if (pass != NULL && auth->pass == NULL)
                                auth->pass = ftp_strdup(pass);
                }

                for (n = 0; n < macnum; ++n) {
                        if (!strcmp("init", macros[n].mac_name)) {
                                (void)strlcpy(line, "$init", sizeof(line));
                                makeargv();
                                domacro(margc, margv);
                                break;
                        }
                }

#ifdef WITH_SSL
                if (ssl) {
                        if ((*ssl = fetch_start_ssl(s, host)) == NULL) {
                                close(s);
                                s = -1;
                                continue;
                        }
                }
#endif
                break;
        }

        FREEPTR(fuser);
        if (pass != NULL)
                memset(pass, 0, strlen(pass));
        FREEPTR(pass);
        if (facct != NULL)
                memset(facct, 0, strlen(facct));
        FREEPTR(facct);

        if (res0)
                freeaddrinfo(res0);
        return s;
}

static int
handle_noproxy(const char *host, in_port_t portnum)
{

        char *cp, *ep, *np, *np_copy, *np_iter, *no_proxy;
        unsigned long np_port;
        size_t hlen, plen;
        int isproxy = 1;

        /* check URL against list of no_proxied sites */
        no_proxy = getoptionvalue("no_proxy");
        if (EMPTYSTRING(no_proxy))
                return isproxy;

        np_iter = np_copy = ftp_strdup(no_proxy);
        hlen = strlen(host);
        while ((cp = strsep(&np_iter, " ,")) != NULL) {
                if (*cp == '\0')
                        continue;
                if ((np = strrchr(cp, ':')) != NULL) {
                        *np++ =  '\0';
                        np_port = strtoul(np, &ep, 10);
                        if (*np == '\0' || *ep != '\0')
                                continue;
                        if (np_port != portnum)
                                continue;
                }
                plen = strlen(cp);
                if (hlen < plen)
                        continue;
                if (strncasecmp(host + hlen - plen, cp, plen) == 0) {
                        isproxy = 0;
                        break;
                }
        }
        FREEPTR(np_copy);
        return isproxy;
}

static int
handle_proxy(const char *url, const char *penv, struct urlinfo *ui,
    struct authinfo *pauth)
{
        struct urlinfo pui;

        if (isipv6addr(ui->host) && strchr(ui->host, '%') != NULL) {
                warnx("Scoped address notation `%s' disallowed via web proxy",
                    ui->host);
                return -1;
        }

        initurlinfo(&pui);
        if (parse_url(penv, "proxy URL", &pui, pauth, NULL) == -1)
                return -1;

        if ((!IS_HTTP_TYPE(pui.utype) && pui.utype != FTP_URL_T) ||
            EMPTYSTRING(pui.host) ||
            (! EMPTYSTRING(pui.path) && strcmp(pui.path, "/") != 0)) {
                warnx("Malformed proxy URL `%s'", penv);
                freeurlinfo(&pui);
                return -1;
        }

        FREEPTR(pui.path);
#ifdef WITH_SSL
        if (ui->utype == HTTPS_URL_T)
                pui.path = ftp_strdup(ui->path);
        else
#endif
                pui.path = ftp_strdup(url);

        freeurlinfo(ui);
        *ui = pui;

        return 0;
}

static void
print_host(FETCH *fin, const struct urlinfo *ui)
{
        char *h, *p;

        if (strchr(ui->host, ':') == NULL) {
                fetch_printf(fin, "Host: %s", ui->host);
        } else {
                /*
                 * strip off IPv6 scope identifier, since it is
                 * local to the node
                 */
                h = ftp_strdup(ui->host);
                if (isipv6addr(h) && (p = strchr(h, '%')) != NULL)
                        *p = '\0';

                fetch_printf(fin, "Host: [%s]", h);
                free(h);
        }

        if ((ui->utype == HTTP_URL_T && ui->portnum != HTTP_PORT) ||
            (ui->utype == HTTPS_URL_T && ui->portnum != HTTPS_PORT))
                fetch_printf(fin, ":%u", ui->portnum);
        fetch_printf(fin, "\r\n");
}

static void
print_agent(FETCH *fin)
{
        const char *useragent;
        if ((useragent = getenv("FTPUSERAGENT")) != NULL) {
                fetch_printf(fin, "User-Agent: %s\r\n", useragent);
        } else {
                fetch_printf(fin, "User-Agent: %s/%s\r\n",
                    FTP_PRODUCT, FTP_VERSION);
        }
}

static void
print_cache(FETCH *fin, int isproxy)
{
        fetch_printf(fin, isproxy ?
            "Pragma: no-cache\r\n" :
            "Cache-Control: no-cache\r\n");
}

static int
print_get(FETCH *fin, int hasleading, int isproxy, const struct urlinfo *oui,
    const struct urlinfo *ui)
{
        const char *leading = hasleading ? ", " : "  (";
        size_t i;

        if (isproxy) {
                if (verbose) {
                        fprintf(ttyout, "%svia %s:%u", leading,
                            ui->host, ui->portnum);
                        leading = ", ";
                        hasleading++;
                }
                fetch_printf(fin, "GET %s HTTP/1.0\r\n", ui->path);
                print_host(fin, oui);
                return hasleading;
        }

        fetch_printf(fin, "GET %s HTTP/1.1\r\n", ui->path);
        print_host(fin, ui);
        fetch_printf(fin, "Accept: */*\r\n");
        fetch_printf(fin, "Connection: close\r\n");
        for (i = 0; i < custom_headers->sl_cur; i++) {
                fetch_printf(fin, "%s\r\n", custom_headers->sl_str[i]);
                DPRINTF("%s: sending custom header `%s'\n", __func__,
                    custom_headers->sl_str[i]);
        }

        if (restart_point) {
                fputs(leading, ttyout);
                fetch_printf(fin, "Range: bytes=" LLF "-\r\n",
                    (LLT)restart_point);
                fprintf(ttyout, "restarting at " LLF, (LLT)restart_point);
                hasleading++;
        }
        return hasleading;
}

static void
getmtime(const char *cp, time_t *mtime)
{
        struct tm parsed;
        const char *t;

        memset(&parsed, 0, sizeof(parsed));
        t = parse_rfc2616time(&parsed, cp);

        if (t == NULL)
                return;

        parsed.tm_isdst = -1;
        if (*t == '\0')
                *mtime = timegm(&parsed);

#ifndef NO_DEBUG
        if (ftp_debug && *mtime != -1) {
                fprintf(ttyout, "parsed time as: %s",
                    rfc2822time(localtime(mtime)));
        }
#endif
}

static int
print_proxy(FETCH *fin, int hasleading, const char *wwwauth,
    const char *proxyauth)
{
        const char *leading = hasleading ? ", " : "  (";

        if (wwwauth) {
                if (verbose) {
                        fprintf(ttyout, "%swith authorization", leading);
                        hasleading++;
                }
                fetch_printf(fin, "Authorization: %s\r\n", wwwauth);
        }
        if (proxyauth) {
                if (verbose) {
                        fprintf(ttyout, "%swith proxy authorization", leading);
                        hasleading++;
                }
                fetch_printf(fin, "Proxy-Authorization: %s\r\n", proxyauth);
        }
        return hasleading;
}

#ifdef WITH_SSL
static void
print_connect(FETCH *fin, const struct urlinfo *ui)
{
        char hname[NI_MAXHOST], *p;
        const char *h;

        if (isipv6addr(ui->host)) {
                /*
                 * strip off IPv6 scope identifier,
                 * since it is local to the node
                 */
                if ((p = strchr(ui->host, '%')) == NULL)
                        snprintf(hname, sizeof(hname), "[%s]", ui->host);
                else
                        snprintf(hname, sizeof(hname), "[%.*s]",
                            (int)(p - ui->host), ui->host);
                h = hname;
        } else
                h = ui->host;

        fetch_printf(fin, "CONNECT %s:%d HTTP/1.1\r\n", h, ui->portnum);
        fetch_printf(fin, "Host: %s:%d\r\n", h, ui->portnum);
}
#endif

#define C_OK 0
#define C_CLEANUP 1
#define C_IMPROPER 2

static int
getresponseline(FETCH *fin, char *buf, size_t buflen, int *len)
{
        const char *errormsg;

        alarmtimer(quit_time ? quit_time : 60);
        *len = fetch_getline(fin, buf, buflen, &errormsg);
        alarmtimer(0);
        if (*len < 0) {
                if (*errormsg == '\n')
                        errormsg++;
                warnx("Receiving HTTP reply: %s", errormsg);
                return C_CLEANUP;
        }
        while (*len > 0 && (ISLWS(buf[*len-1])))
                buf[--*len] = '\0';

        if (*len)
                DPRINTF("%s: received `%s'\n", __func__, buf);
        return C_OK;
}

static int
getresponse(FETCH *fin, char **cp, size_t buflen, int *hcode)
{
        int len, rv;
        char *ep, *buf = *cp;

        *hcode = 0;
        if ((rv = getresponseline(fin, buf, buflen, &len)) != C_OK)
                return rv;

        /* Determine HTTP response code */
        *cp = strchr(buf, ' ');
        if (*cp == NULL)
                return C_IMPROPER;

        (*cp)++;

        *hcode = strtol(*cp, &ep, 10);
        if (*ep != '\0' && !isspace((unsigned char)*ep))
                return C_IMPROPER;

        return C_OK;
}

static int
parse_posinfo(const char **cp, struct posinfo *pi)
{
        char *ep;
        if (!match_token(cp, "bytes"))
                return -1;

        if (**cp == '*')
                (*cp)++;
        else {
                pi->rangestart = STRTOLL(*cp, &ep, 10);
                if (pi->rangestart < 0 || *ep != '-')
                        return -1;
                *cp = ep + 1;
                pi->rangeend = STRTOLL(*cp, &ep, 10);
                if (pi->rangeend < 0 || pi->rangeend < pi->rangestart)
                        return -1;
                *cp = ep;
        }
        if (**cp != '/')
                return -1;
        (*cp)++;
        if (**cp == '*')
                (*cp)++;
        else {
                pi->entitylen = STRTOLL(*cp, &ep, 10);
                if (pi->entitylen < 0)
                        return -1;
                *cp = ep;
        }
        if (**cp != '\0')
                return -1;

#ifndef NO_DEBUG
        if (ftp_debug) {
                fprintf(ttyout, "parsed range as: ");
                if (pi->rangestart == -1)
                        fprintf(ttyout, "*");
                else
                        fprintf(ttyout, LLF "-" LLF, (LLT)pi->rangestart,
                            (LLT)pi->rangeend);
                fprintf(ttyout, "/" LLF "\n", (LLT)pi->entitylen);
        }
#endif
        return 0;
}

#ifndef NO_AUTH
static void
do_auth(int hcode, const char *url, const char *penv, struct authinfo *wauth,
    struct authinfo *pauth, char **auth, const char *message,
    volatile int *rval, struct urlinfo *ui)
{
        struct authinfo aauth;
        char *response;

        if (hcode == 401)
                aauth = *wauth;
        else
                aauth = *pauth;

        if (verbose || aauth.auth == NULL ||
            aauth.user == NULL || aauth.pass == NULL)
                fprintf(ttyout, "%s\n", message);
        if (EMPTYSTRING(*auth)) {
                warnx("No authentication challenge provided by server");
                return;
        }

        if (aauth.auth != NULL) {
                char reply[10];

                fprintf(ttyout, "Authorization failed. Retry (y/n)? ");
                if (get_line(stdin, reply, sizeof(reply), NULL) < 0) {
                        return;
                }
                if (tolower((unsigned char)reply[0]) != 'y')
                        return;

                aauth.user = NULL;
                aauth.pass = NULL;
        }

        if (auth_url(*auth, &response, &aauth) == 0) {
                *rval = fetch_url(url, penv,
                    hcode == 401 ? pauth->auth : response,
                    hcode == 401 ? response : wauth->auth,
                    ui);
                memset(response, 0, strlen(response));
                FREEPTR(response);
        }
}
#endif

static int
negotiate_connection(FETCH *fin, const char *url, const char *penv,
    struct posinfo *pi, time_t *mtime, struct authinfo *wauth,
    struct authinfo *pauth, volatile int *rval, volatile int *ischunked,
    char **auth, struct urlinfo *ui)
{
        int                     len, hcode, rv;
        char                    *buf = NULL, *ep;
        const char              *cp, *token;
        char                    *location, *message;

        *auth = message = location = NULL;

        buf = ftp_malloc(ftp_buflen);

        /* Read the response */
        ep = buf;
        switch (getresponse(fin, &ep, ftp_buflen, &hcode)) {
        case C_CLEANUP:
                goto cleanup_fetch_url;
        case C_IMPROPER:
                goto improper;
        case C_OK:
                message = ftp_strdup(ep);
                break;
        }

        /* Read the rest of the header. */

        for (;;) {
                if ((rv = getresponseline(fin, buf, ftp_buflen, &len)) != C_OK)
                        goto cleanup_fetch_url;
                if (len == 0)
                        break;

        /*
         * Look for some headers
         */

                cp = buf;

                if (match_token(&cp, "Content-Length:")) {
                        filesize = STRTOLL(cp, &ep, 10);
                        if (filesize < 0 || *ep != '\0')
                                goto improper;
                        DPRINTF("%s: parsed len as: " LLF "\n",
                            __func__, (LLT)filesize);

                } else if (match_token(&cp, "Content-Range:")) {
                        if (parse_posinfo(&cp, pi) == -1)
                                goto improper;
                        if (! restart_point) {
                                warnx(
                            "Received unexpected Content-Range header");
                                goto cleanup_fetch_url;
                        }

                } else if (match_token(&cp, "Last-Modified:")) {
                        getmtime(cp, mtime);

                } else if (match_token(&cp, "Location:")) {
                        location = ftp_strdup(cp);
                        DPRINTF("%s: parsed location as `%s'\n",
                            __func__, cp);

                } else if (match_token(&cp, "Transfer-Encoding:")) {
                        if (match_token(&cp, "binary")) {
                                warnx(
                "Bogus transfer encoding `binary' (fetching anyway)");
                                continue;
                        }
                        if (! (token = match_token(&cp, "chunked"))) {
                                warnx(
                            "Unsupported transfer encoding `%s'",
                                    cp);
                                goto cleanup_fetch_url;
                        }
                        (*ischunked)++;
                        DPRINTF("%s: using chunked encoding\n",
                            __func__);

                } else if (match_token(&cp, "Proxy-Authenticate:")
                        || match_token(&cp, "WWW-Authenticate:")) {
                        if (! (token = match_token(&cp, "Basic"))) {
                                DPRINTF("%s: skipping unknown auth "
                                    "scheme `%s'\n", __func__, cp);
                                continue;
                        }
                        FREEPTR(*auth);
                        *auth = ftp_strdup(token);
                        DPRINTF("%s: parsed auth as `%s'\n",
                            __func__, cp);
                }

        }
                        /* finished parsing header */

        switch (hcode) {
        case 200:
                break;
        case 206:
                if (! restart_point) {
                        warnx("Not expecting partial content header");
                        goto cleanup_fetch_url;
                }
                break;
        case 300:
        case 301:
        case 302:
        case 303:
        case 305:
        case 307:
                if (EMPTYSTRING(location)) {
                        warnx(
                        "No redirection Location provided by server");
                        goto cleanup_fetch_url;
                }
                if (redirect_loop++ > 5) {
                        warnx("Too many redirections requested");
                        goto cleanup_fetch_url;
                }
                if (hcode == 305) {
                        if (verbose)
                                fprintf(ttyout, "Redirected via %s\n",
                                    location);
                        *rval = fetch_url(url, location,
                            pauth->auth, wauth->auth, ui);
                } else {
                        if (verbose)
                                fprintf(ttyout, "Redirected to %s\n",
                                    location);
                        location = make_absurl(location, url);
                        *rval = go_fetch(location, ui);
                }
                goto cleanup_fetch_url;
#ifndef NO_AUTH
        case 401:
        case 407:
                do_auth(hcode, url, penv, wauth, pauth, auth, message, rval,
                    ui);
                goto cleanup_fetch_url;
#endif
        default:
                if (message)
                        warnx("Error retrieving file `%s'", message);
                else
                        warnx("Unknown error retrieving file");
                goto cleanup_fetch_url;
        }
        rv = C_OK;
        goto out;

cleanup_fetch_url:
        rv = C_CLEANUP;
        goto out;
improper:
        rv = C_IMPROPER;
        goto out;
out:
        FREEPTR(buf);
        FREEPTR(message);
        FREEPTR(location);
        return rv;
}               /* end of ftp:// or http:// specific setup */

#ifdef WITH_SSL
static int
connectmethod(FETCH *fin, const char *url, const char *penv,
    struct urlinfo *oui, struct urlinfo *ui, struct authinfo *wauth,
    struct authinfo *pauth, char **auth, int *hasleading, volatile int *rval)
{
        void *ssl;
        int hcode, rv;
        const char *cp;
        char *buf = NULL, *ep;
        char *message = NULL;

        print_connect(fin, oui);

        print_agent(fin);
        *hasleading = print_proxy(fin, *hasleading, NULL, pauth->auth);

        if (verbose && *hasleading)
                fputs(")\n", ttyout);
        *hasleading = 0;

        fetch_printf(fin, "\r\n");
        if (fetch_flush(fin) == EOF) {
                warn("Writing HTTP request");
                alarmtimer(0);
                goto cleanup_fetch_url;
        }
        alarmtimer(0);

        buf = ftp_malloc(ftp_buflen);

        /* Read the response */
        ep = buf;
        switch (getresponse(fin, &ep, ftp_buflen, &hcode)) {
        case C_CLEANUP:
                goto cleanup_fetch_url;
        case C_IMPROPER:
                goto improper;
        case C_OK:
                message = ftp_strdup(ep);
                break;
        }

        for (;;) {
                int len;
                if (getresponseline(fin, buf, ftp_buflen, &len) != C_OK)
                        goto cleanup_fetch_url;
                if (len == 0)
                        break;

                cp = buf;
                if (match_token(&cp, "Proxy-Authenticate:")) {
                        const char *token;
                        if (!(token = match_token(&cp, "Basic"))) {
                                DPRINTF(
                                    "%s: skipping unknown auth scheme `%s'\n",
                                    __func__, cp);
                                continue;
                        }
                        FREEPTR(*auth);
                        *auth = ftp_strdup(token);
                        DPRINTF("%s: parsed auth as " "`%s'\n", __func__, cp);
                }
        }

        /* finished parsing header */
        switch (hcode) {
        case 200:
                break;
#ifndef NO_AUTH
        case 407:
                do_auth(hcode, url, penv, wauth, pauth, auth, message, rval,
                    ui);
                goto cleanup_fetch_url;
#endif
        default:
                if (message)
                        warnx("Error proxy connect " "`%s'", message);
                else
                        warnx("Unknown error proxy " "connect");
                goto cleanup_fetch_url;
        }

        if ((ssl = fetch_start_ssl(fetch_fileno(fin), oui->host)) == NULL)
                goto cleanup_fetch_url;
        fetch_set_ssl(fin, ssl);

        rv = C_OK;
        goto out;
improper:
        rv = C_IMPROPER;
        goto out;
cleanup_fetch_url:
        rv = C_CLEANUP;
        goto out;
out:
        FREEPTR(buf);
        FREEPTR(message);
        return rv;
}
#endif

/*
 * Retrieve URL, via a proxy if necessary, using HTTP.
 * If proxyenv is set, use that for the proxy, otherwise try ftp_proxy or
 * http_proxy/https_proxy as appropriate.
 * Supports HTTP redirects.
 * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
 * is still open (e.g, ftp xfer with trailing /)
 */
static int
fetch_url(const char *url, const char *proxyenv, char *proxyauth,
    char *wwwauth, struct urlinfo *rui)
{
        sigfunc volatile        oldint;
        sigfunc volatile        oldpipe;
        sigfunc volatile        oldalrm;
        sigfunc volatile        oldquit;
        int volatile            s;
        struct stat             sb;
        int volatile            isproxy;
        int volatile            rval, ischunked;
        size_t                  flen;
        static size_t           bufsize;
        static char             *xferbuf;
        const char              *cp;
        char                    *ep;
        char                    *volatile auth;
        char                    *volatile savefile;
        char                    *volatile location;
        char                    *volatile message;
        char                    *volatile decodedpath;
        struct authinfo         wauth, pauth;
        struct posinfo          pi;
        off_t                   hashbytes;
        int                     (*volatile closefunc)(FILE *);
        FETCH                   *volatile fin;
        FILE                    *volatile fout;
        const char              *volatile penv = proxyenv;
        struct urlinfo          ui, oui;
        time_t                  mtime;
        void                    *ssl = NULL;

        DPRINTF("%s: `%s' proxyenv `%s'\n", __func__, url, STRorNULL(penv));

        oldquit = oldalrm = oldint = oldpipe = SIG_ERR;
        closefunc = NULL;
        fin = NULL;
        fout = NULL;
        s = -1;
        savefile = NULL;
        auth = location = message = NULL;
        ischunked = isproxy = 0;
        rval = 1;

        initurlinfo(&ui);
        initurlinfo(&oui);
        initauthinfo(&wauth, wwwauth);
        initauthinfo(&pauth, proxyauth);

        decodedpath = NULL;

        if (sigsetjmp(httpabort, 1))
                goto cleanup_fetch_url;

        if (parse_url(url, "URL", &ui, &wauth, rui) == -1)
                goto cleanup_fetch_url;

        copyurlinfo(&oui, &ui);

        if (ui.utype == FILE_URL_T && ! EMPTYSTRING(ui.host)
            && strcasecmp(ui.host, "localhost") != 0) {
                warnx("No support for non local file URL `%s'", url);
                goto cleanup_fetch_url;
        }

        if (EMPTYSTRING(ui.path)) {
                if (ui.utype == FTP_URL_T) {
                        rval = fetch_ftp(url);
                        goto cleanup_fetch_url;
                }
                if (!IS_HTTP_TYPE(ui.utype) || outfile == NULL)  {
                        warnx("Invalid URL (no file after host) `%s'", url);
                        goto cleanup_fetch_url;
                }
        }

        decodedpath = ftp_strdup(ui.path);
        url_decode(decodedpath);

        if (outfile)
                savefile = outfile;
        else {
                cp = strrchr(decodedpath, '/');         /* find savefile */
                if (cp != NULL)
                        savefile = ftp_strdup(cp + 1);
                else
                        savefile = ftp_strdup(decodedpath);
                /*
                 * Use the first URL we requested not the name after a
                 * possible redirect, but careful to save it because our
                 * "safety" check is the match to outfile.
                 */
                outfile = ftp_strdup(savefile);
        }
        DPRINTF("%s: savefile `%s'\n", __func__, savefile);
        if (EMPTYSTRING(savefile)) {
                if (ui.utype == FTP_URL_T) {
                        rval = fetch_ftp(url);
                        goto cleanup_fetch_url;
                }
                warnx("No file after directory (you must specify an "
                    "output file) `%s'", url);
                goto cleanup_fetch_url;
        }

        restart_point = 0;
        filesize = -1;
        initposinfo(&pi);
        mtime = -1;
        if (restartautofetch) {
                if (stat(savefile, &sb) == 0)
                        restart_point = sb.st_size;
        }
        if (ui.utype == FILE_URL_T) {           /* file:// URLs */
                direction = "copied";
                fin = fetch_open(decodedpath, "r");
                if (fin == NULL) {
                        warn("Can't open `%s'", decodedpath);
                        goto cleanup_fetch_url;
                }
                if (fstat(fetch_fileno(fin), &sb) == 0) {
                        mtime = sb.st_mtime;
                        filesize = sb.st_size;
                }
                if (restart_point) {
                        if (lseek(fetch_fileno(fin), restart_point, SEEK_SET) 
                            < 0) {
                                warn("Can't seek to restart `%s'",
                                    decodedpath);
                                goto cleanup_fetch_url;
                        }
                }
                if (verbose) {
                        fprintf(ttyout, "Copying %s", decodedpath);
                        if (restart_point)
                                fprintf(ttyout, " (restarting at " LLF ")",
                                    (LLT)restart_point);
                        fputs("\n", ttyout);
                }
                if (0 == rcvbuf_size) {
                        rcvbuf_size = XFERBUFMAX;
                }
        } else {                                /* ftp:// or http:// URLs */
                int hasleading;
                static char hostnamebuf[MAXHOSTNAMELEN];

                (void)strlcpy(hostnamebuf, ui.host, sizeof(hostnamebuf));
                hostname = hostnamebuf;

                if (penv == NULL) {
#ifdef WITH_SSL
                        if (ui.utype == HTTPS_URL_T)
                                penv = getoptionvalue("https_proxy");
#endif
                        if (penv == NULL && IS_HTTP_TYPE(ui.utype))
                                penv = getoptionvalue("http_proxy");
                        else if (ui.utype == FTP_URL_T)
                                penv = getoptionvalue("ftp_proxy");
                }
                direction = "retrieved";
                if (! EMPTYSTRING(penv)) {                      /* use proxy */

                        isproxy = handle_noproxy(ui.host, ui.portnum);

                        if (isproxy == 0 && ui.utype == FTP_URL_T) {
                                rval = fetch_ftp(url);
                                goto cleanup_fetch_url;
                        }

                        if (isproxy) {
                                if (restart_point) {
                                        warnx(
                                            "Can't restart via proxy URL `%s'",
                                            penv);
                                        goto cleanup_fetch_url;
                                }
                                if (handle_proxy(url, penv, &ui, &pauth) < 0)
                                        goto cleanup_fetch_url;
                        }
                } /* ! EMPTYSTRING(penv) */

                s = ftp_socket(&ui, &ssl, &wauth);
                if (s < 0) {
                        warnx("Can't connect to `%s:%s'", ui.host, ui.port);
                        goto cleanup_fetch_url;
                }

                oldalrm = xsignal(SIGALRM, timeouthttp);
                alarmtimer(quit_time ? quit_time : 60);
                fin = fetch_fdopen(s, "r+");
                fetch_set_ssl(fin, ssl);
                alarmtimer(0);

                alarmtimer(quit_time ? quit_time : 60);
                /*
                 * Construct and send the request.
                 */
                if (verbose)
                        fprintf(ttyout, "Requesting %s\n", url);

                hasleading = 0;
#ifdef WITH_SSL
                if (isproxy && oui.utype == HTTPS_URL_T) {
                        switch (connectmethod(fin, url, penv, &oui, &ui,
                            &wauth, &pauth, __UNVOLATILE(&auth), &hasleading,
                            &rval)) {
                        case C_CLEANUP:
                                goto cleanup_fetch_url;
                        case C_IMPROPER:
                                goto improper;
                        case C_OK:
                                break;
                        default:
                                abort();
                        }
                }
#endif

                hasleading = print_get(fin, hasleading, isproxy, &oui, &ui);

                if (flushcache)
                        print_cache(fin, isproxy);

                print_agent(fin);
                hasleading = print_proxy(fin, hasleading, wauth.auth,
                     auth ? NULL : pauth.auth);
                if (hasleading) {
                        hasleading = 0;
                        if (verbose)
                                fputs(")\n", ttyout);
                }

                fetch_printf(fin, "\r\n");
                if (fetch_flush(fin) == EOF) {
                        warn("Writing HTTP request");
                        alarmtimer(0);
                        goto cleanup_fetch_url;
                }
                alarmtimer(0);

                switch (negotiate_connection(fin, url, penv, &pi,
                    &mtime, &wauth, &pauth, &rval, &ischunked,
                    __UNVOLATILE(&auth), &ui)) {
                case C_OK:
                        break;
                case C_CLEANUP:
                        goto cleanup_fetch_url;
                case C_IMPROPER:
                        goto improper;
                default:
                        abort();
                }
        }

        /* Open the output file. */

        /*
         * Only trust filenames with special meaning if they came from
         * the command line
         */
        if (outfile == savefile) {
                if (strcmp(savefile, "-") == 0) {
                        fout = stdout;
                } else if (*savefile == '|') {
                        oldpipe = xsignal(SIGPIPE, SIG_IGN);
                        fout = popen(savefile + 1, "w");
                        if (fout == NULL) {
                                warn("Can't execute `%s'", savefile + 1);
                                goto cleanup_fetch_url;
                        }
                        closefunc = pclose;
                }
        }
        if (fout == NULL) {
                if (restart_point && (
                    (pi.rangeend != -1 && pi.rangeend <= restart_point) ||
                    (pi.rangestart == -1 &&
                    filesize != -1 && filesize <= restart_point))) {
                        /* already done */
                        if (verbose)
                                fprintf(ttyout, "already done\n");
                        rval = 0;
                        goto cleanup_fetch_url;
                }
                if (restart_point && pi.rangestart != -1) {
                        if (pi.entitylen != -1)
                                filesize = pi.entitylen;
                        if (pi.rangestart != restart_point) {
                                warnx(
                                    "Size of `%s' differs from save file `%s'",
                                    url, savefile);
                                goto cleanup_fetch_url;
                        }
                        fout = fopen(savefile, "a");
                } else
                        fout = fopen(savefile, "w");
                if (fout == NULL) {
                        warn("Can't open `%s'", savefile);
                        goto cleanup_fetch_url;
                }
                closefunc = fclose;
        }

                        /* Trap signals */
        oldquit = xsignal(SIGQUIT, psummary);
        oldint = xsignal(SIGINT, aborthttp);

                        /* Resize xferbuf to clamped rcvbuf_size */
        if (bufsize == 0 || (size_t)rcvbuf_size != bufsize) {
                if (xferbuf)
                        (void)free(xferbuf);
                if (rcvbuf_size == 0)
                        bufsize = XFERBUFMAX;
                else
                        bufsize = MAX(XFERBUFMIN, MIN(rcvbuf_size, XFERBUFMAX));
                xferbuf = ftp_malloc(bufsize);
                DPRINTF("resized xferbuf to bufsize %zu using rcvbuf_size %d\n",
                    bufsize, rcvbuf_size);
        }

        bytes = 0;
        hashbytes = mark;
        if (oldalrm != SIG_ERR) {
                (void)xsignal(SIGALRM, oldalrm);
                oldalrm = SIG_ERR;
        }
        progressmeter(-1);

                        /* Finally, suck down the file. */
        do {
                long chunksize;
                short lastchunk;

                chunksize = 0;
                lastchunk = 0;
                                        /* read chunk-size */
                if (ischunked) {
                        if (fetch_getln(xferbuf, (int)bufsize, fin) == NULL) {
                                warnx("Unexpected EOF reading chunk-size");
                                goto cleanup_fetch_url;
                        }
                        errno = 0;
                        chunksize = strtol(xferbuf, &ep, 16);
                        if (ep == xferbuf) {
                                warnx("Invalid chunk-size");
                                goto cleanup_fetch_url;
                        }
                        if (errno == ERANGE || chunksize < 0) {
                                errno = ERANGE;
                                warn("Chunk-size `%.*s'",
                                    (int)(ep-xferbuf), xferbuf);
                                goto cleanup_fetch_url;
                        }

                                /*
                                 * XXX: Work around bug in Apache 1.3.9 and
                                 *      1.3.11, which incorrectly put trailing
                                 *      space after the chunk-size.
                                 */
                        while (*ep == ' ')
                                ep++;

                                        /* skip [ chunk-ext ] */
                        if (*ep == ';') {
                                while (*ep && *ep != '\r')
                                        ep++;
                        }

                        if (strcmp(ep, "\r\n") != 0) {
                                warnx("Unexpected data following chunk-size");
                                goto cleanup_fetch_url;
                        }
                        DPRINTF("%s: got chunk-size of " LLF "\n", __func__,
                            (LLT)chunksize);
                        if (chunksize == 0) {
                                lastchunk = 1;
                                goto chunkdone;
                        }
                }
                                        /* transfer file or chunk */
                for (;;) {
                        struct timeval then, now, td;
                        volatile off_t bufrem;

                        if (rate_get)
                                (void)gettimeofday(&then, NULL);
                        bufrem = rate_get ? rate_get : (off_t)bufsize;
                        if (ischunked)
                                bufrem = MIN(chunksize, bufrem);
                        while (bufrem > 0) {
                                size_t nr = MIN((off_t)bufsize, bufrem);
                                flen = fetch_read(xferbuf, sizeof(char),
                                    nr, fin);
                                if (flen == 0) {
                                        if (fetch_error(fin))
                                                goto chunkerror;
                                        goto chunkdone;
                                }
                                bytes += flen;
                                bufrem -= flen;
                                if (maxwrite(xferbuf, sizeof(char), flen, fout)
                                    != flen) {
                                        warn("Writing `%s'", savefile);
                                        goto cleanup_fetch_url;
                                }
                                if (hash && !progress) {
                                        while (bytes >= hashbytes) {
                                                (void)putc('#', ttyout);
                                                hashbytes += mark;
                                        }
                                        (void)fflush(ttyout);
                                }
                                if (ischunked) {
                                        chunksize -= flen;
                                        if (chunksize <= 0)
                                                break;
                                }
                        }
                        if (rate_get) {
                                for (;;) {
                                        (void)gettimeofday(&now, NULL);
                                        timersub(&now, &then, &td);
                                        if (td.tv_sec > 0)
                                                break;
                                        usleep(1000000 - td.tv_usec);
                                }
                        }
                        if (ischunked && chunksize <= 0)
                                break;
                }
                                        /* read CRLF after chunk*/
 chunkdone:
                if (ischunked) {
                        if (fetch_getln(xferbuf, (int)bufsize, fin) == NULL) {
                                alarmtimer(0);
                                warnx("Unexpected EOF reading chunk CRLF");
                                goto cleanup_fetch_url;
                        }
                        if (strcmp(xferbuf, "\r\n") != 0) {
                                warnx("Unexpected data following chunk");
                                goto cleanup_fetch_url;
                        }
                        if (lastchunk)
                                break;
                }
        } while (ischunked);

/* XXX: deal with optional trailer & CRLF here? */
chunkerror:
        if (hash && !progress && bytes > 0) {
                if (bytes < mark)
                        (void)putc('#', ttyout);
                (void)putc('\n', ttyout);
        }
        if (fetch_error(fin)) {
                warn("Reading file");
                goto cleanup_fetch_url;
        }
        progressmeter(1);
        (void)fflush(fout);
        if (closefunc == fclose && mtime != -1) {
                struct timeval tval[2];

                (void)gettimeofday(&tval[0], NULL);
                tval[1].tv_sec = mtime;
                tval[1].tv_usec = 0;
                (*closefunc)(fout);
                fout = NULL;

                if (utimes(savefile, tval) == -1) {
                        fprintf(ttyout,
                            "Can't change modification time to %s",
                            rfc2822time(localtime(&mtime)));
                }
        }
        if (bytes > 0)
                ptransfer(0);

                /* fail if short transfer when filesize is known */
        if (filesize >= 0 && (bytes + restart_point < filesize))
                goto cleanup_fetch_url;

        bytes = 0;

        rval = 0;
        goto cleanup_fetch_url;

 improper:
        warnx("Improper response from `%s:%s'", ui.host, ui.port);

 cleanup_fetch_url:
        if (oldint != SIG_ERR)
                (void)xsignal(SIGINT, oldint);
        if (oldpipe != SIG_ERR)
                (void)xsignal(SIGPIPE, oldpipe);
        if (oldalrm != SIG_ERR)
                (void)xsignal(SIGALRM, oldalrm);
        if (oldquit != SIG_ERR)
                (void)xsignal(SIGQUIT, oldquit);
        if (fin != NULL)
                fetch_close(fin);
        else if (s != -1)
                close(s);
        if (closefunc != NULL && fout != NULL)
                (*closefunc)(fout);
        if (savefile != outfile)
                FREEPTR(savefile);
        freeurlinfo(&ui);
        freeurlinfo(&oui);
        freeauthinfo(&wauth);
        freeauthinfo(&pauth);
        FREEPTR(decodedpath);
        FREEPTR(auth);
        FREEPTR(location);
        FREEPTR(message);
        return (rval);
}

/*
 * Abort a HTTP retrieval
 */
static void
aborthttp(int notused __unused)
{
        char msgbuf[100];
        int len;

        sigint_raised = 1;
        alarmtimer(0);
        if (fromatty) {
                len = snprintf(msgbuf, sizeof(msgbuf),
                    "\n%s: HTTP fetch aborted.\n", getprogname());
                if (len > 0)
                        write(fileno(ttyout), msgbuf, len);
        }
        siglongjmp(httpabort, 1);
}

static void
timeouthttp(int notused __unused)
{
        char msgbuf[100];
        int len;

        alarmtimer(0);
        if (fromatty) {
                len = snprintf(msgbuf, sizeof(msgbuf),
                    "\n%s: HTTP fetch timeout.\n", getprogname());
                if (len > 0)
                        write(fileno(ttyout), msgbuf, len);
        }
        siglongjmp(httpabort, 1);
}

/*
 * Retrieve ftp URL or classic ftp argument using FTP.
 * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
 * is still open (e.g, ftp xfer with trailing /)
 */
static int
fetch_ftp(const char *url)
{
        char            *cp, *xargv[5], rempath[MAXPATHLEN];
        char            *dir, *file;
        char             cmdbuf[MAXPATHLEN];
        char             dirbuf[4];
        int              dirhasglob, filehasglob, rval, transtype, xargc;
        int              oanonftp, oautologin;
        struct authinfo  auth;
        struct urlinfo   ui;

        DPRINTF("%s: `%s'\n", __func__, url);
        dir = file = NULL;
        rval = 1;
        transtype = TYPE_I;

        initurlinfo(&ui);
        initauthinfo(&auth, NULL);

        if (STRNEQUAL(url, FTP_URL)) {
                if ((parse_url(url, "URL", &ui, &auth, NULL) == -1) ||
                    (auth.user != NULL && *auth.user == '\0') ||
                    EMPTYSTRING(ui.host)) {
                        warnx("Invalid URL `%s'", url);
                        goto cleanup_fetch_ftp;
                }
                /*
                 * Note: Don't url_decode(path) here.  We need to keep the
                 * distinction between "/" and "%2F" until later.
                 */

                                        /* check for trailing ';type=[aid]' */
                if (! EMPTYSTRING(ui.path)
                    && (cp = strrchr(ui.path, ';')) != NULL) {
                        if (strcasecmp(cp, ";type=a") == 0)
                                transtype = TYPE_A;
                        else if (strcasecmp(cp, ";type=i") == 0)
                                transtype = TYPE_I;
                        else if (strcasecmp(cp, ";type=d") == 0) {
                                warnx(
                            "Directory listing via a URL is not supported");
                                goto cleanup_fetch_ftp;
                        } else {
                                warnx("Invalid suffix `%s' in URL `%s'", cp,
                                    url);
                                goto cleanup_fetch_ftp;
                        }
                        *cp = 0;
                }
        } else {                        /* classic style `[user@]host:[file]' */
                ui.utype = CLASSIC_URL_T;
                ui.host = ftp_strdup(url);
                cp = strchr(ui.host, '@');
                if (cp != NULL) {
                        *cp = '\0';
                        auth.user = ui.host;
                        anonftp = 0;    /* disable anonftp */
                        ui.host = ftp_strdup(cp + 1);
                }
                cp = strchr(ui.host, ':');
                if (cp != NULL) {
                        *cp = '\0';
                        ui.path = ftp_strdup(cp + 1);
                }
        }
        if (EMPTYSTRING(ui.host))
                goto cleanup_fetch_ftp;

                        /* Extract the file and (if present) directory name. */
        dir = ui.path;
        if (! EMPTYSTRING(dir)) {
                /*
                 * If we are dealing with classic `[user@]host:[path]' syntax,
                 * then a path of the form `/file' (resulting from input of the
                 * form `host:/file') means that we should do "CWD /" before
                 * retrieving the file.  So we set dir="/" and file="file".
                 *
                 * But if we are dealing with URLs like `ftp://host/path' then
                 * a path of the form `/file' (resulting from a URL of the form
                 * `ftp://host//file') means that we should do `CWD ' (with an
                 * empty argument) before retrieving the file.  So we set
                 * dir="" and file="file".
                 *
                 * If the path does not contain / at all, we set dir=NULL.
                 * (We get a path without any slashes if we are dealing with
                 * classic `[user@]host:[file]' or URL `ftp://host/file'.)
                 *
                 * In all other cases, we set dir to a string that does not
                 * include the final '/' that separates the dir part from the
                 * file part of the path.  (This will be the empty string if
                 * and only if we are dealing with a path of the form `/file'
                 * resulting from an URL of the form `ftp://host//file'.)
                 */
                cp = strrchr(dir, '/');
                if (cp == dir && ui.utype == CLASSIC_URL_T) {
                        file = cp + 1;
                        (void)strlcpy(dirbuf, "/", sizeof(dirbuf));
                        dir = dirbuf;
                } else if (cp != NULL) {
                        *cp++ = '\0';
                        file = cp;
                } else {
                        file = dir;
                        dir = NULL;
                }
        } else
                dir = NULL;
        if (ui.utype == FTP_URL_T && file != NULL) {
                url_decode(file);
                /* but still don't url_decode(dir) */
        }
        DPRINTF("%s: user `%s' pass `%s' host %s port %s "
            "path `%s' dir `%s' file `%s'\n", __func__,
            STRorNULL(auth.user), STRorNULL(auth.pass),
            STRorNULL(ui.host), STRorNULL(ui.port),
            STRorNULL(ui.path), STRorNULL(dir), STRorNULL(file));

        dirhasglob = filehasglob = 0;
        if (doglob &&
            (ui.utype == CLASSIC_URL_T || ui.utype == FTP_URL_T)) {
                if (! EMPTYSTRING(dir) && strpbrk(dir, "*?[]{}") != NULL)
                        dirhasglob = 1;
                if (! EMPTYSTRING(file) && strpbrk(file, "*?[]{}") != NULL)
                        filehasglob = 1;
        }

                        /* Set up the connection */
        oanonftp = anonftp;
        if (connected)
                disconnect(0, NULL);
        anonftp = oanonftp;
        (void)strlcpy(cmdbuf, getprogname(), sizeof(cmdbuf));
        xargv[0] = cmdbuf;
        xargv[1] = ui.host;
        xargv[2] = NULL;
        xargc = 2;
        if (ui.port) {
                xargv[2] = ui.port;
                xargv[3] = NULL;
                xargc = 3;
        }
        oautologin = autologin;
                /* don't autologin in setpeer(), use ftp_login() below */
        autologin = 0;
        setpeer(xargc, xargv);
        autologin = oautologin;
        if ((connected == 0) ||
            (connected == 1 && !ftp_login(ui.host, auth.user, auth.pass))) {
                warnx("Can't connect or login to host `%s:%s'",
                        ui.host, ui.port ? ui.port : "?");
                goto cleanup_fetch_ftp;
        }

        switch (transtype) {
        case TYPE_A:
                setascii(1, xargv);
                break;
        case TYPE_I:
                setbinary(1, xargv);
                break;
        default:
                errx(1, "%s: unknown transfer type %d", __func__, transtype);
        }

                /*
                 * Change directories, if necessary.
                 *
                 * Note: don't use EMPTYSTRING(dir) below, because
                 * dir=="" means something different from dir==NULL.
                 */
        if (dir != NULL && !dirhasglob) {
                char *nextpart;

                /*
                 * If we are dealing with a classic `[user@]host:[path]'
                 * (urltype is CLASSIC_URL_T) then we have a raw directory
                 * name (not encoded in any way) and we can change
                 * directories in one step.
                 *
                 * If we are dealing with an `ftp://host/path' URL
                 * (urltype is FTP_URL_T), then RFC 3986 says we need to
                 * send a separate CWD command for each unescaped "/"
                 * in the path, and we have to interpret %hex escaping
                 * *after* we find the slashes.  It's possible to get
                 * empty components here, (from multiple adjacent
                 * slashes in the path) and RFC 3986 says that we should
                 * still do `CWD ' (with a null argument) in such cases.
                 *
                 * Many ftp servers don't support `CWD ', so if there's an
                 * error performing that command, bail out with a descriptive
                 * message.
                 *
                 * Examples:
                 *
                 * host:                        dir="", urltype=CLASSIC_URL_T
                 *              logged in (to default directory)
                 * host:file                    dir=NULL, urltype=CLASSIC_URL_T
                 *              "RETR file"
                 * host:dir/                    dir="dir", urltype=CLASSIC_URL_T
                 *              "CWD dir", logged in
                 * ftp://host/                  dir="", urltype=FTP_URL_T
                 *              logged in (to default directory)
                 * ftp://host/dir/              dir="dir", urltype=FTP_URL_T
                 *              "CWD dir", logged in
                 * ftp://host/file              dir=NULL, urltype=FTP_URL_T
                 *              "RETR file"
                 * ftp://host//file             dir="", urltype=FTP_URL_T
                 *              "CWD ", "RETR file"
                 * host:/file                   dir="/", urltype=CLASSIC_URL_T
                 *              "CWD /", "RETR file"
                 * ftp://host///file            dir="/", urltype=FTP_URL_T
                 *              "CWD ", "CWD ", "RETR file"
                 * ftp://host/%2F/file          dir="%2F", urltype=FTP_URL_T
                 *              "CWD /", "RETR file"
                 * ftp://host/foo/file          dir="foo", urltype=FTP_URL_T
                 *              "CWD foo", "RETR file"
                 * ftp://host/foo/bar/file      dir="foo/bar"
                 *              "CWD foo", "CWD bar", "RETR file"
                 * ftp://host//foo/bar/file     dir="/foo/bar"
                 *              "CWD ", "CWD foo", "CWD bar", "RETR file"
                 * ftp://host/foo//bar/file     dir="foo//bar"
                 *              "CWD foo", "CWD ", "CWD bar", "RETR file"
                 * ftp://host/%2F/foo/bar/file  dir="%2F/foo/bar"
                 *              "CWD /", "CWD foo", "CWD bar", "RETR file"
                 * ftp://host/%2Ffoo/bar/file   dir="%2Ffoo/bar"
                 *              "CWD /foo", "CWD bar", "RETR file"
                 * ftp://host/%2Ffoo%2Fbar/file dir="%2Ffoo%2Fbar"
                 *              "CWD /foo/bar", "RETR file"
                 * ftp://host/%2Ffoo%2Fbar%2Ffile       dir=NULL
                 *              "RETR /foo/bar/file"
                 *
                 * Note that we don't need `dir' after this point.
                 */
                do {
                        if (ui.utype == FTP_URL_T) {
                                nextpart = strchr(dir, '/');
                                if (nextpart) {
                                        *nextpart = '\0';
                                        nextpart++;
                                }
                                url_decode(dir);
                        } else
                                nextpart = NULL;
                        DPRINTF("%s: dir `%s', nextpart `%s'\n", __func__,
                            STRorNULL(dir), STRorNULL(nextpart));
                        if (ui.utype == FTP_URL_T || *dir != '\0') {
                                (void)strlcpy(cmdbuf, "cd", sizeof(cmdbuf));
                                xargv[0] = cmdbuf;
                                xargv[1] = dir;
                                xargv[2] = NULL;
                                dirchange = 0;
                                cd(2, xargv);
                                if (! dirchange) {
                                        if (*dir == '\0' && code == 500)
                                                fprintf(stderr,
"\n"
"ftp: The `CWD ' command (without a directory), which is required by\n"
"     RFC 3986 to support the empty directory in the URL pathname (`//'),\n"
"     conflicts with the server's conformance to RFC 959.\n"
"     Try the same URL without the `//' in the URL pathname.\n"
"\n");
                                        goto cleanup_fetch_ftp;
                                }
                        }
                        dir = nextpart;
                } while (dir != NULL);
        }

        if (EMPTYSTRING(file)) {
                rval = -1;
                goto cleanup_fetch_ftp;
        }

        if (dirhasglob) {
                (void)strlcpy(rempath, dir,     sizeof(rempath));
                (void)strlcat(rempath, "/",     sizeof(rempath));
                (void)strlcat(rempath, file,    sizeof(rempath));
                file = rempath;
        }

                        /* Fetch the file(s). */
        xargc = 2;
        (void)strlcpy(cmdbuf, "get", sizeof(cmdbuf));
        xargv[0] = cmdbuf;
        xargv[1] = file;
        xargv[2] = NULL;
        if (dirhasglob || filehasglob) {
                int ointeractive;

                ointeractive = interactive;
                interactive = 0;
                if (restartautofetch)
                        (void)strlcpy(cmdbuf, "mreget", sizeof(cmdbuf));
                else
                        (void)strlcpy(cmdbuf, "mget", sizeof(cmdbuf));
                xargv[0] = cmdbuf;
                mget(xargc, xargv);
                interactive = ointeractive;
        } else {
                char *destfile = outfile;
                if (destfile == NULL) {
                        cp = strrchr(file, '/');        /* find savefile */
                        if (cp != NULL)
                                destfile = cp + 1;
                        else
                                destfile = file;
                }
                xargv[2] = (char *)destfile;
                xargv[3] = NULL;
                xargc++;
                if (restartautofetch)
                        reget(xargc, xargv);
                else
                        get(xargc, xargv);
        }

        if ((code / 100) == COMPLETE)
                rval = 0;

 cleanup_fetch_ftp:
        freeurlinfo(&ui);
        freeauthinfo(&auth);
        return (rval);
}

/*
 * Retrieve the given file to outfile.
 * Supports arguments of the form:
 *      "host:path", "ftp://host/path"  if $ftpproxy, call fetch_url() else
 *                                      call fetch_ftp()
 *      "http://host/path"              call fetch_url() to use HTTP
 *      "file:///path"                  call fetch_url() to copy
 *      "about:..."                     print a message
 *
 * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
 * is still open (e.g, ftp xfer with trailing /)
 */
static int
go_fetch(const char *url, struct urlinfo *rui)
{
        char *proxyenv;
        const char *p;

#ifndef NO_ABOUT
        /*
         * Check for about:*
         */
        if (STRNEQUAL(url, ABOUT_URL)) {
                url += sizeof(ABOUT_URL) -1;
                if (strcasecmp(url, "ftp") == 0 ||
                    strcasecmp(url, "tnftp") == 0) {
                        fputs(
"This version of ftp has been enhanced by Luke Mewburn <lukem@NetBSD.org>\n"
"for the NetBSD project.  Execute `man ftp' for more details.\n", ttyout);
                } else if (strcasecmp(url, "lukem") == 0) {
                        fputs(
"Luke Mewburn is the author of most of the enhancements in this ftp client.\n"
"Please email feedback to <lukem@NetBSD.org>.\n", ttyout);
                } else if (strcasecmp(url, "netbsd") == 0) {
                        fputs(
"NetBSD is a freely available and redistributable UNIX-like operating system.\n"
"For more information, see http://www.NetBSD.org/\n", ttyout);
                } else if (strcasecmp(url, "version") == 0) {
                        fprintf(ttyout, "Version: %s %s%s\n",
                            FTP_PRODUCT, FTP_VERSION,
#ifdef INET6
                            ""
#else
                            " (-IPv6)"
#endif
                        );
                } else {
                        fprintf(ttyout, "`%s' is an interesting topic.\n", url);
                }
                fputs("\n", ttyout);
                return (0);
        }
#endif

        /*
         * Check for file:// and http:// URLs.
         */
        if (STRNEQUAL(url, HTTP_URL)
#ifdef WITH_SSL
            || STRNEQUAL(url, HTTPS_URL)
#endif
            || STRNEQUAL(url, FILE_URL))
                return (fetch_url(url, NULL, NULL, NULL, rui));

        /*
         * If it contains "://" but does not begin with ftp://
         * or something that was already handled, then it's
         * unsupported.
         *
         * If it contains ":" but not "://" then we assume the
         * part before the colon is a host name, not an URL scheme,
         * so we don't try to match that here.
         */
        if ((p = strstr(url, "://")) != NULL && ! STRNEQUAL(url, FTP_URL))
                errx(1, "Unsupported URL scheme `%.*s'", (int)(p - url), url);

        /*
         * Refer to previous urlinfo if provided. This makes relative
         * redirects work.
         */
        if (use_relative(rui))
            return fetch_url(url, NULL, NULL, NULL, rui);

        /*
         * Try FTP URL-style and host:file arguments next.
         * If ftpproxy is set with an FTP URL, use fetch_url()
         * Otherwise, use fetch_ftp().
         */
        proxyenv = getoptionvalue("ftp_proxy");
        if (!EMPTYSTRING(proxyenv) && STRNEQUAL(url, FTP_URL))
                return (fetch_url(url, NULL, NULL, NULL, rui));

        return (fetch_ftp(url));
}

/*
 * Retrieve multiple files from the command line,
 * calling go_fetch() for each file.
 *
 * If an ftp path has a trailing "/", the path will be cd-ed into and
 * the connection remains open, and the function will return -1
 * (to indicate the connection is alive).
 * If an error occurs the return value will be the offset+1 in
 * argv[] of the file that caused a problem (i.e, argv[x]
 * returns x+1)
 * Otherwise, 0 is returned if all files retrieved successfully.
 */
int
auto_fetch(int argc, char *argv[])
{
        volatile int    argpos, rval;

        argpos = rval = 0;

        if (sigsetjmp(toplevel, 1)) {
                if (connected)
                        disconnect(0, NULL);
                if (rval > 0)
                        rval = argpos + 1;
                return (rval);
        }
        (void)xsignal(SIGINT, intr);
        (void)xsignal(SIGPIPE, lostpeer);

        /*
         * Loop through as long as there's files to fetch.
         */
        for (; (rval == 0) && (argpos < argc); argpos++) {
                if (strchr(argv[argpos], ':') == NULL)
                        break;
                redirect_loop = 0;
                if (!anonftp)
                        anonftp = 2;    /* Handle "automatic" transfers. */
                rval = go_fetch(argv[argpos], NULL);
                if (outfile != NULL && strcmp(outfile, "-") != 0
                    && outfile[0] != '|') {
                        FREEPTR(outfile);
                }
                if (rval > 0)
                        rval = argpos + 1;
        }

        if (connected && rval != -1)
                disconnect(0, NULL);
        return (rval);
}


/*
 * Upload multiple files from the command line.
 *
 * If an error occurs the return value will be the offset+1 in
 * argv[] of the file that caused a problem (i.e, argv[x]
 * returns x+1)
 * Otherwise, 0 is returned if all files uploaded successfully.
 */
int
auto_put(int argc, char **argv, const char *uploadserver)
{
        char    *uargv[4], *path, *pathsep;
        int      uargc, rval, argpos;
        size_t   len;
        char     cmdbuf[MAX_C_NAME];

        (void)strlcpy(cmdbuf, "mput", sizeof(cmdbuf));
        uargv[0] = cmdbuf;
        uargv[1] = argv[0];
        uargc = 2;
        uargv[2] = uargv[3] = NULL;
        pathsep = NULL;
        rval = 1;

        DPRINTF("%s: target `%s'\n", __func__, uploadserver);

        path = ftp_strdup(uploadserver);
        len = strlen(path);
        if (path[len - 1] != '/' && path[len - 1] != ':') {
                        /*
                         * make sure we always pass a directory to auto_fetch
                         */
                if (argc > 1) {         /* more than one file to upload */
                        len = strlen(uploadserver) + 2; /* path + "/" + "\0" */
                        free(path);
                        path = (char *)ftp_malloc(len);
                        (void)strlcpy(path, uploadserver, len);
                        (void)strlcat(path, "/", len);
                } else {                /* single file to upload */
                        (void)strlcpy(cmdbuf, "put", sizeof(cmdbuf));
                        uargv[0] = cmdbuf;
                        pathsep = strrchr(path, '/');
                        if (pathsep == NULL) {
                                pathsep = strrchr(path, ':');
                                if (pathsep == NULL) {
                                        warnx("Invalid URL `%s'", path);
                                        goto cleanup_auto_put;
                                }
                                pathsep++;
                                uargv[2] = ftp_strdup(pathsep);
                                pathsep[0] = '/';
                        } else
                                uargv[2] = ftp_strdup(pathsep + 1);
                        pathsep[1] = '\0';
                        uargc++;
                }
        }
        DPRINTF("%s: URL `%s' argv[2] `%s'\n", __func__,
            path, STRorNULL(uargv[2]));

                        /* connect and cwd */
        rval = auto_fetch(1, &path);
        if(rval >= 0)
                goto cleanup_auto_put;

        rval = 0;

                        /* target filename provided; upload 1 file */
                        /* XXX : is this the best way? */
        if (uargc == 3) {
                uargv[1] = argv[0];
                put(uargc, uargv);
                if ((code / 100) != COMPLETE)
                        rval = 1;
        } else {        /* otherwise a target dir: upload all files to it */
                for(argpos = 0; argv[argpos] != NULL; argpos++) {
                        uargv[1] = argv[argpos];
                        mput(uargc, uargv);
                        if ((code / 100) != COMPLETE) {
                                rval = argpos + 1;
                                break;
                        }
                }
        }

 cleanup_auto_put:
        free(path);
        FREEPTR(uargv[2]);
        return (rval);
}