usr.bin/fetch/fetch.c

root/usr.bin/fetch/fetch.c
/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2000-2014 Dag-Erling Smørgrav
 * Copyright (c) 2013 Michael Gmelin <freebsd@grem.de>
 * All rights reserved.
 *
 * 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
 *    in this position and unchanged.
 * 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <getopt.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>

#include <fetch.h>

#define MINBUFSIZE      16384
#define TIMEOUT         120

/* Option flags */
static int       A_flag;        /*    -A: do not follow 302 redirects */
static int       a_flag;        /*    -a: auto retry */
static off_t     B_size;        /*    -B: buffer size */
static int       b_flag;        /*!   -b: workaround TCP bug */
static char    *c_dirname;      /*    -c: remote directory */
static int       d_flag;        /*    -d: direct connection */
static int       F_flag;        /*    -F: restart without checking mtime  */
static char     *f_filename;    /*    -f: file to fetch */
static char     *h_hostname;    /*    -h: host to fetch from */
static int       i_flag;        /*    -i: specify file for mtime comparison */
static char     *i_filename;    /*        name of input file */
static int       l_flag;        /*    -l: link rather than copy file: URLs */
static int       m_flag;        /* -[Mm]: mirror mode */
static char     *N_filename;    /*    -N: netrc file name */
static int       n_flag;        /*    -n: do not preserve modification time */
static int       o_flag;        /*    -o: specify output file */
static int       o_directory;   /*        output file is a directory */
static char     *o_filename;    /*        name of output file */
static int       o_stdout;      /*        output file is stdout */
static int       once_flag;     /*    -1: stop at first successful file */
static int       p_flag;        /* -[Pp]: use passive FTP */
static int       R_flag;        /*    -R: don't delete partial files */
static int       r_flag;        /*    -r: restart previous transfer */
static off_t     S_size;        /*    -S: require size to match */
static int       s_flag;        /*    -s: show size, don't fetch */
static long      T_secs;        /*    -T: transfer timeout in seconds */
static int       t_flag;        /*!   -t: workaround TCP bug */
static int       U_flag;        /*    -U: do not use high ports */
static int       v_level = 1;   /*    -v: verbosity level */
static int       v_tty;         /*        stdout is a tty */
static int       v_progress;    /*        whether to display progress */
static pid_t     pgrp;          /*        our process group */
static long      w_secs;        /*    -w: retry delay */
static int       family = PF_UNSPEC;    /* -[46]: address family to use */

static int       sigalrm;       /* SIGALRM received */
static int       siginfo;       /* SIGINFO received */
static int       sigint;        /* SIGINT received */

static long      ftp_timeout = TIMEOUT; /* default timeout for FTP transfers */
static long      http_timeout = TIMEOUT;/* default timeout for HTTP transfers */
static char     *buf;           /* transfer buffer */

enum options
{
        OPTION_BIND_ADDRESS,
        OPTION_NO_FTP_PASSIVE_MODE,
        OPTION_HTTP_REFERER,
        OPTION_HTTP_USER_AGENT,
        OPTION_NO_PROXY,
        OPTION_SSL_CA_CERT_FILE,
        OPTION_SSL_CA_CERT_PATH,
        OPTION_SSL_CLIENT_CERT_FILE,
        OPTION_SSL_CLIENT_KEY_FILE,
        OPTION_SSL_CRL_FILE,
        OPTION_SSL_NO_SSL3,
        OPTION_SSL_NO_TLS1,
        OPTION_SSL_NO_VERIFY_HOSTNAME,
        OPTION_SSL_NO_VERIFY_PEER
};


static struct option longopts[] =
{
        /* mapping to single character argument */
        { "one-file", no_argument, NULL, '1' },
        { "ipv4-only", no_argument, NULL, '4' },
        { "ipv6-only", no_argument, NULL, '6' },
        { "no-redirect", no_argument, NULL, 'A' },
        { "retry", no_argument, NULL, 'a' },
        { "buffer-size", required_argument, NULL, 'B' },
        /* -c not mapped, since it's deprecated */
        { "direct", no_argument, NULL, 'd' },
        { "force-restart", no_argument, NULL, 'F' },
        /* -f not mapped, since it's deprecated */
        /* -h not mapped, since it's deprecated */
        { "if-modified-since", required_argument, NULL, 'i' },
        { "symlink", no_argument, NULL, 'l' },
        /* -M not mapped since it's the same as -m */
        { "mirror", no_argument, NULL, 'm' },
        { "netrc", required_argument, NULL, 'N' },
        { "no-mtime", no_argument, NULL, 'n' },
        { "output", required_argument, NULL, 'o' },
        /* -P not mapped since it's the same as -p */
        { "passive", no_argument, NULL, 'p' },
        { "quiet", no_argument, NULL, 'q' },
        { "keep-output", no_argument, NULL, 'R' },
        { "restart", no_argument, NULL, 'r' },
        { "require-size", required_argument, NULL, 'S' },
        { "print-size", no_argument, NULL, 's' },
        { "timeout", required_argument, NULL, 'T' },
        { "passive-portrange-default", no_argument, NULL, 'T' },
        { "verbose", no_argument, NULL, 'v' },
        { "retry-delay", required_argument, NULL, 'w' },

        /* options without a single character equivalent */
        { "bind-address", required_argument, NULL, OPTION_BIND_ADDRESS },
        { "no-passive", no_argument, NULL, OPTION_NO_FTP_PASSIVE_MODE },
        { "referer", required_argument, NULL, OPTION_HTTP_REFERER },
        { "user-agent", required_argument, NULL, OPTION_HTTP_USER_AGENT },
        { "no-proxy", required_argument, NULL, OPTION_NO_PROXY },
        { "ca-cert", required_argument, NULL, OPTION_SSL_CA_CERT_FILE },
        { "ca-path", required_argument, NULL, OPTION_SSL_CA_CERT_PATH },
        { "cert", required_argument, NULL, OPTION_SSL_CLIENT_CERT_FILE },
        { "key", required_argument, NULL, OPTION_SSL_CLIENT_KEY_FILE },
        { "crl", required_argument, NULL, OPTION_SSL_CRL_FILE },
        { "no-sslv3", no_argument, NULL, OPTION_SSL_NO_SSL3 },
        { "no-tlsv1", no_argument, NULL, OPTION_SSL_NO_TLS1 },
        { "no-verify-hostname", no_argument, NULL, OPTION_SSL_NO_VERIFY_HOSTNAME },
        { "no-verify-peer", no_argument, NULL, OPTION_SSL_NO_VERIFY_PEER },

        { NULL, 0, NULL, 0 }
};

/*
 * Signal handler
 */
static void
sig_handler(int sig)
{
        switch (sig) {
        case SIGALRM:
                sigalrm = 1;
                break;
        case SIGINFO:
                siginfo = 1;
                break;
        case SIGINT:
                sigint = 1;
                break;
        }
}

struct xferstat {
        char             name[64];
        struct timeval   start;         /* start of transfer */
        struct timeval   last;          /* time of last update */
        struct timeval   last2;         /* time of previous last update */
        off_t            size;          /* size of file per HTTP hdr */
        off_t            offset;        /* starting offset in file */
        off_t            rcvd;          /* bytes already received */
        off_t            lastrcvd;      /* bytes received since last update */
};

/*
 * Format a number of seconds as either XXdYYh, XXhYYm, XXmYYs, or XXs
 * depending on its magnitude
 */
static void
stat_seconds(char *str, size_t strsz, long seconds)
{

        if (seconds > 86400)
                snprintf(str, strsz, "%02ldd%02ldh",
                    seconds / 86400, (seconds % 86400) / 3600);
        else if (seconds > 3600)
                snprintf(str, strsz, "%02ldh%02ldm",
                    seconds / 3600, (seconds % 3600) / 60);
        else if (seconds > 60)
                snprintf(str, strsz, "%02ldm%02lds",
                    seconds / 60, seconds % 60);
        else
                snprintf(str, strsz, "   %02lds",
                    seconds);
}

/*
 * Compute and display ETA
 */
static void
stat_eta(char *str, size_t strsz, const struct xferstat *xs)
{
        long elapsed, eta;
        off_t received, expected;

        elapsed = xs->last.tv_sec - xs->start.tv_sec;
        received = xs->rcvd - xs->offset;
        expected = xs->size - xs->rcvd;
        eta = (long)((double)elapsed * expected / received);
        if (eta > 0)
                stat_seconds(str, strsz, eta);
        else
                stat_seconds(str, strsz, elapsed);
}

/*
 * Format a number as "xxxx YB" where Y is ' ', 'k', 'M'...
 */
static const char *prefixes = " kMGTP";
static void
stat_bytes(char *str, size_t strsz, off_t bytes)
{
        const char *prefix = prefixes;

        while (bytes > 9999 && prefix[1] != '\0') {
                bytes /= 1024;
                prefix++;
        }
        snprintf(str, strsz, "%4ju %cB", (uintmax_t)bytes, *prefix);
}

/*
 * Compute and display transfer rate
 */
static void
stat_bps(char *str, size_t strsz, struct xferstat *xs)
{
        char bytes[16];
        double delta, bps;

        delta = ((double)xs->last.tv_sec + (xs->last.tv_usec / 1.e6))
            - ((double)xs->last2.tv_sec + (xs->last2.tv_usec / 1.e6));

        if (delta == 0.0) {
                snprintf(str, strsz, "?? Bps");
        } else {
                bps = (xs->rcvd - xs->lastrcvd) / delta;
                stat_bytes(bytes, sizeof bytes, (off_t)bps);
                snprintf(str, strsz, "%sps", bytes);
        }
}

/*
 * Update the stats display
 */
static void
stat_display(struct xferstat *xs, int force)
{
        char bytes[16], bps[16], eta[16];
        struct timeval now;
        int ctty_pgrp;

        /* check if we're the foreground process */
        if (ioctl(STDERR_FILENO, TIOCGPGRP, &ctty_pgrp) != 0 ||
            (pid_t)ctty_pgrp != pgrp)
                return;

        gettimeofday(&now, NULL);
        if (!force && now.tv_sec <= xs->last.tv_sec)
                return;
        xs->last2 = xs->last;
        xs->last = now;

        fprintf(stderr, "\r%-46.46s", xs->name);
        if (xs->rcvd >= xs->size) {
                stat_bytes(bytes, sizeof bytes, xs->rcvd);
                setproctitle("%s [%s]", xs->name, bytes);
                fprintf(stderr, "        %s", bytes);
        } else {
                stat_bytes(bytes, sizeof bytes, xs->size);
                setproctitle("%s [%d%% of %s]", xs->name,
                    (int)((100.0 * xs->rcvd) / xs->size),
                    bytes);
                fprintf(stderr, "%3d%% of %s",
                    (int)((100.0 * xs->rcvd) / xs->size),
                    bytes);
        }
        if (force == 2) {
                xs->lastrcvd = xs->offset;
                xs->last2 = xs->start;
        }
        stat_bps(bps, sizeof bps, xs);
        fprintf(stderr, " %s", bps);
        if ((xs->size > 0 && xs->rcvd > 0 &&
             xs->last.tv_sec >= xs->start.tv_sec + 3) ||
            force == 2) {
                stat_eta(eta, sizeof eta, xs);
                fprintf(stderr, " %s", eta);
        }
        xs->lastrcvd = xs->rcvd;
}

/*
 * Initialize the transfer statistics
 */
static void
stat_start(struct xferstat *xs, const char *name, off_t size, off_t offset)
{

        memset(xs, 0, sizeof *xs);
        snprintf(xs->name, sizeof xs->name, "%s", name);
        gettimeofday(&xs->start, NULL);
        xs->last2 = xs->last = xs->start;
        xs->size = size;
        xs->offset = offset;
        xs->rcvd = offset;
        xs->lastrcvd = offset;
        if (v_progress)
                stat_display(xs, 1);
        else if (v_level > 0)
                fprintf(stderr, "%-46s", xs->name);
}

/*
 * Update the transfer statistics
 */
static void
stat_update(struct xferstat *xs, off_t rcvd)
{

        xs->rcvd = rcvd;
        if (v_progress)
                stat_display(xs, 0);
}

/*
 * Finalize the transfer statistics
 */
static void
stat_end(struct xferstat *xs)
{
        char bytes[16], bps[16], eta[16];

        gettimeofday(&xs->last, NULL);
        if (v_progress) {
                stat_display(xs, 2);
                putc('\n', stderr);
        } else if (v_level > 0) {
                stat_bytes(bytes, sizeof bytes, xs->rcvd);
                stat_bps(bps, sizeof bps, xs);
                stat_eta(eta, sizeof eta, xs);
                fprintf(stderr, "        %s %s %s\n", bytes, bps, eta);
        }
}

/*
 * Ask the user for authentication details
 */
static int
query_auth(struct url *URL)
{
        struct termios tios;
        tcflag_t saved_flags;
        int i, nopwd;

        fprintf(stderr, "Authentication required for <%s://%s:%d/>!\n",
            URL->scheme, URL->host, URL->port);

        fprintf(stderr, "Login: ");
        if (fgets(URL->user, sizeof URL->user, stdin) == NULL)
                return (-1);
        for (i = strlen(URL->user); i >= 0; --i)
                if (URL->user[i] == '\r' || URL->user[i] == '\n')
                        URL->user[i] = '\0';

        fprintf(stderr, "Password: ");
        if (tcgetattr(STDIN_FILENO, &tios) == 0) {
                saved_flags = tios.c_lflag;
                tios.c_lflag &= ~ECHO;
                tios.c_lflag |= ECHONL|ICANON;
                tcsetattr(STDIN_FILENO, TCSAFLUSH|TCSASOFT, &tios);
                nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
                tios.c_lflag = saved_flags;
                tcsetattr(STDIN_FILENO, TCSANOW|TCSASOFT, &tios);
        } else {
                nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
        }
        if (nopwd)
                return (-1);
        for (i = strlen(URL->pwd); i >= 0; --i)
                if (URL->pwd[i] == '\r' || URL->pwd[i] == '\n')
                        URL->pwd[i] = '\0';

        return (0);
}

/*
 * Fetch a file
 */
static int
fetch(char *URL, const char *path, int *is_http)
{
        struct url *url;
        struct url_stat us;
        struct stat sb, nsb;
        struct xferstat xs;
        FILE *f, *of;
        size_t size, readcnt, wr;
        off_t count, size_prev;
        char flags[8];
        const char *slash;
        char *tmppath;
        int r, tries;
        unsigned timeout;
        char *ptr;

        f = of = NULL;
        tmppath = NULL;

        timeout = 0;
        *flags = 0;
        count = 0;

        /* set verbosity level */
        if (v_level > 1)
                strcat(flags, "v");
        if (v_level > 2)
                fetchDebug = 1;

        /* parse URL */
        url = NULL;
        if (*URL == '\0') {
                warnx("empty URL");
                goto failure;
        }
        if ((url = fetchParseURL(URL)) == NULL) {
                warnx("%s: parse error", URL);
                goto failure;
        }

        /* if no scheme was specified, take a guess */
        if (!*url->scheme) {
                if (!*url->host)
                        strcpy(url->scheme, SCHEME_FILE);
                else if (strncasecmp(url->host, "ftp.", 4) == 0)
                        strcpy(url->scheme, SCHEME_FTP);
                else if (strncasecmp(url->host, "www.", 4) == 0)
                        strcpy(url->scheme, SCHEME_HTTP);
        }

        /* for both of http and https */
        *is_http = strncmp(url->scheme, "http", 4) == 0;

        /* common flags */
        switch (family) {
        case PF_INET:
                strcat(flags, "4");
                break;
        case PF_INET6:
                strcat(flags, "6");
                break;
        }

        /* FTP specific flags */
        if (strcmp(url->scheme, SCHEME_FTP) == 0) {
                if (p_flag)
                        strcat(flags, "p");
                if (d_flag)
                        strcat(flags, "d");
                if (U_flag)
                        strcat(flags, "l");
                timeout = T_secs ? T_secs : ftp_timeout;
        }

        /* HTTP specific flags */
        if (strcmp(url->scheme, SCHEME_HTTP) == 0 ||
            strcmp(url->scheme, SCHEME_HTTPS) == 0) {
                if (d_flag)
                        strcat(flags, "d");
                if (A_flag)
                        strcat(flags, "A");
                timeout = T_secs ? T_secs : http_timeout;
                if (i_flag) {
                        if (stat(i_filename, &sb)) {
                                warn("%s: stat()", i_filename);
                                goto failure;
                        }
                        url->ims_time = sb.st_mtime;
                        strcat(flags, "i");
                }
        }

        /* set the protocol timeout. */
        fetchTimeout = timeout;

        /* just print size */
        if (s_flag) {
                if (timeout)
                        alarm(timeout);
                r = fetchStat(url, &us, flags);
                if (timeout)
                        alarm(0);
                if (sigalrm || sigint)
                        goto signal;
                if (r == -1) {
                        warnx("%s", fetchLastErrString);
                        goto failure;
                }
                if (us.size == -1)
                        printf("Unknown\n");
                else
                        printf("%jd\n", (intmax_t)us.size);
                goto success;
        }

        tries = 1;
again:
        r = 0;
        /*
         * If the -r flag was specified, we have to compare the local
         * and remote files, so we should really do a fetchStat()
         * first, but I know of at least one HTTP server that only
         * sends the content size in response to GET requests, and
         * leaves it out of replies to HEAD requests.  Also, in the
         * (frequent) case that the local and remote files match but
         * the local file is truncated, we have sufficient information
         * before the compare to issue a correct request.  Therefore,
         * we always issue a GET request as if we were sure the local
         * file was a truncated copy of the remote file; we can drop
         * the connection later if we change our minds.
         */
        sb.st_size = -1;
        if (!o_stdout) {
                r = stat(path, &sb);
                if (r == 0 && (r_flag || tries > 1) && S_ISREG(sb.st_mode)) {
                        url->offset = sb.st_size;
                } else if (r == -1 || !S_ISREG(sb.st_mode)) {
                        /*
                         * Whatever value sb.st_size has now is either
                         * wrong (if stat(2) failed) or irrelevant (if the
                         * path does not refer to a regular file)
                         */
                        sb.st_size = -1;
                }
                if (r == -1 && errno != ENOENT) {
                        warnx("%s: stat()", path);
                        goto failure;
                }
        }
        size_prev = sb.st_size;

        /* start the transfer */
        if (timeout)
                alarm(timeout);
        f = fetchXGet(url, &us, flags);
        if (timeout)
                alarm(0);
        if (sigalrm || sigint)
                goto signal;
        if (f == NULL) {
                if (i_flag && *is_http && fetchLastErrCode == FETCH_OK &&
                    strcmp(fetchLastErrString, "Not Modified") == 0) {
                        /* HTTP Not Modified Response, return OK. */
                        if (v_level > 0)
                                warnx("%s: %s", URL, fetchLastErrString);
                        r = 0;
                        goto done;
                } else {
                        warnx("%s: %s", URL, fetchLastErrString);
                        goto failure;
                }
        }
        if (sigint)
                goto signal;

        /* check that size is as expected */
        if (S_size) {
                if (us.size == -1) {
                        warnx("%s: size unknown", URL);
                } else if (us.size != S_size) {
                        warnx("%s: size mismatch: expected %jd, actual %jd",
                            URL, (intmax_t)S_size, (intmax_t)us.size);
                        goto failure;
                }
        }

        /* symlink instead of copy */
        if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
                if (symlink(url->doc, path) == -1) {
                        warn("%s: symlink()", path);
                        goto failure;
                }
                goto success;
        }

        if (us.size == -1 && !o_stdout && v_level > 0)
                warnx("%s: size of remote file is not known", URL);
        if (v_level > 1) {
                if (sb.st_size != -1)
                        fprintf(stderr, "local size / mtime: %jd / %ld\n",
                            (intmax_t)sb.st_size, (long)sb.st_mtime);
                if (us.size != -1)
                        fprintf(stderr, "remote size / mtime: %jd / %ld\n",
                            (intmax_t)us.size, (long)us.mtime);
        }

        /* open output file */
        if (o_stdout) {
                /* output to stdout */
                of = stdout;
        } else if (r_flag && sb.st_size != -1) {
                /* resume mode, local file exists */
                if (!F_flag && us.mtime && sb.st_mtime != us.mtime && tries == 1) {
                        /* no match! have to refetch */
                        fclose(f);
                        /* if precious, warn the user and give up */
                        if (R_flag) {
                                warnx("%s: local modification time "
                                    "does not match remote", path);
                                goto failure_keep;
                        }
                } else if (url->offset > sb.st_size) {
                        /* gap between what we asked for and what we got */
                        warnx("%s: gap in resume mode", URL);
                        fclose(of);
                        of = NULL;
                        /* picked up again later */
                } else if (us.size != -1) {
                        if (us.size == sb.st_size)
                                /* nothing to do */
                                goto success;
                        if (sb.st_size > us.size) {
                                /* local file too long! */
                                warnx("%s: local file (%jd bytes) is longer "
                                    "than remote file (%jd bytes)", path,
                                    (intmax_t)sb.st_size, (intmax_t)us.size);
                                goto failure;
                        }
                        /* we got it, open local file */
                        if ((of = fopen(path, "r+")) == NULL) {
                                warn("%s: fopen()", path);
                                goto failure;
                        }
                        /* check that it didn't move under our feet */
                        if (fstat(fileno(of), &nsb) == -1) {
                                /* can't happen! */
                                warn("%s: fstat()", path);
                                goto failure;
                        }
                        if (nsb.st_dev != sb.st_dev ||
                            nsb.st_ino != sb.st_ino ||
                            nsb.st_size != sb.st_size) {
                                warnx("%s: file has changed", URL);
                                fclose(of);
                                of = NULL;
                                sb = nsb;
                                /* picked up again later */
                        }
                }
                /* seek to where we left off */
                if (of != NULL && fseeko(of, url->offset, SEEK_SET) != 0) {
                        warn("%s: fseeko()", path);
                        fclose(of);
                        of = NULL;
                        /* picked up again later */
                }
        } else if (m_flag && sb.st_size != -1) {
                /* mirror mode, local file exists */
                if (sb.st_size == us.size && sb.st_mtime == us.mtime)
                        goto success;
        }

        if (of == NULL) {
                /*
                 * We don't yet have an output file; either this is a
                 * vanilla run with no special flags, or the local and
                 * remote files didn't match.
                 */

                if (url->offset > 0) {
                        /*
                         * We tried to restart a transfer, but for
                         * some reason gave up - so we have to restart
                         * from scratch if we want the whole file
                         */
                        url->offset = 0;
                        if ((f = fetchXGet(url, &us, flags)) == NULL) {
                                warnx("%s: %s", URL, fetchLastErrString);
                                goto failure;
                        }
                        if (sigint)
                                goto signal;
                }

                /* construct a temp file name */
                if (sb.st_size != -1 && S_ISREG(sb.st_mode)) {
                        if ((slash = strrchr(path, '/')) == NULL)
                                slash = path;
                        else
                                ++slash;
                        if(tmppath != NULL)
                                free(tmppath);
                        asprintf(&tmppath, "%.*s.fetch.XXXXXX.%s",
                            (int)(slash - path), path, slash);
                        if (tmppath != NULL) {
                                if (mkstemps(tmppath, strlen(slash) + 1) == -1) {
                                        warn("%s: mkstemps()", path);
                                        goto failure;
                                }
                                of = fopen(tmppath, "w");
                                chown(tmppath, sb.st_uid, sb.st_gid);
                                chmod(tmppath, sb.st_mode & ALLPERMS);
                        }
                }
                if (of == NULL)
                        of = fopen(path, "w");
                if (of == NULL) {
                        warn("%s: open()", path);
                        goto failure;
                }
        }
        count = url->offset;

        /* start the counter */
        stat_start(&xs, path, us.size, count);

        sigalrm = siginfo = sigint = 0;

        /* suck in the data */
        setvbuf(f, NULL, _IOFBF, B_size);
        signal(SIGINFO, sig_handler);
        while (!sigint) {
                if (us.size != -1 && us.size - count < B_size &&
                    us.size - count >= 0)
                        size = us.size - count;
                else
                        size = B_size;
                if (siginfo) {
                        stat_end(&xs);
                        siginfo = 0;
                }

                if (size == 0)
                        break;

                if ((readcnt = fread(buf, 1, size, f)) < size) {
                        if (ferror(f) && errno == EINTR && !sigint)
                                clearerr(f);
                        else if (readcnt == 0)
                                break;
                }

                stat_update(&xs, count += readcnt);
                for (ptr = buf; readcnt > 0; ptr += wr, readcnt -= wr)
                        if ((wr = fwrite(ptr, 1, readcnt, of)) < readcnt) {
                                if (ferror(of) && errno == EINTR && !sigint)
                                        clearerr(of);
                                else
                                        break;
                        }
                if (readcnt != 0)
                        break;
        }
        if (!sigalrm)
                sigalrm = ferror(f) && errno == ETIMEDOUT;
        signal(SIGINFO, SIG_DFL);

        stat_end(&xs);

        /*
         * If the transfer timed out or was interrupted, we still want to
         * set the mtime in case the file is not removed (-r or -R) and
         * the user later restarts the transfer.
         */
 signal:
        /* set mtime of local file */
        if (!n_flag && us.mtime && !o_stdout && of != NULL &&
            (stat(path, &sb) != -1) && sb.st_mode & S_IFREG) {
                struct timeval tv[2];

                fflush(of);
                tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime);
                tv[1].tv_sec = (long)us.mtime;
                tv[0].tv_usec = tv[1].tv_usec = 0;
                if (utimes(tmppath ? tmppath : path, tv))
                        warn("%s: utimes()", tmppath ? tmppath : path);
        }

        /* timed out or interrupted? */
        if (sigalrm)
                warnx("transfer timed out");
        if (sigint) {
                warnx("transfer interrupted");
                goto failure;
        }

        /* timeout / interrupt before connection completley established? */
        if (f == NULL)
                goto failure;

        if (!sigalrm) {
                /* check the status of our files */
                if (ferror(f))
                        warn("%s", URL);
                if (ferror(of))
                        warn("%s", path);
                if (ferror(f) || ferror(of))
                        goto failure;
        }

        /* did the transfer complete normally? */
        if (us.size != -1 && count < us.size) {
                warnx("%s appears to be truncated: %jd/%jd bytes",
                    path, (intmax_t)count, (intmax_t)us.size);
                if(!o_stdout && a_flag && count > size_prev) {
                        fclose(f);
                        if (w_secs)
                                sleep(w_secs);
                        tries++;
                        goto again;
                }
                goto failure_keep;
        }

        /*
         * If the transfer timed out and we didn't know how much to
         * expect, assume the worst (i.e. we didn't get all of it)
         */
        if (sigalrm && us.size == -1) {
                warnx("%s may be truncated", path);
                goto failure_keep;
        }

 success:
        r = 0;
        if (tmppath != NULL && rename(tmppath, path) == -1) {
                warn("%s: rename()", path);
                goto failure_keep;
        }
        goto done;
 failure:
        if (of && of != stdout && !R_flag && !r_flag)
                if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
                        unlink(tmppath ? tmppath : path);
        if (R_flag && tmppath != NULL && sb.st_size == -1)
                rename(tmppath, path); /* ignore errors here */
 failure_keep:
        r = -1;
        goto done;
 done:
        if (f)
                fclose(f);
        if (of && of != stdout)
                fclose(of);
        if (url)
                fetchFreeURL(url);
        if (tmppath != NULL)
                free(tmppath);
        return (r);
}

static void
usage(void)
{
        fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
"usage: fetch [-146AadFlMmnPpqRrsUv] [-B bytes] [--bind-address=host]",
"       [--ca-cert=file] [--ca-path=dir] [--cert=file] [--crl=file]",
"       [-i file] [--key=file] [-N file] [--no-passive] [--no-proxy=list]",
"       [--no-sslv3] [--no-tlsv1] [--no-verify-hostname] [--no-verify-peer]",
"       [-o file] [--referer=URL] [-S bytes] [-T seconds]",
"       [--user-agent=agent-string] [-w seconds] URL ...",
"       fetch [-146AadFlMmnPpqRrsUv] [-B bytes] [--bind-address=host]",
"       [--ca-cert=file] [--ca-path=dir] [--cert=file] [--crl=file]",
"       [-i file] [--key=file] [-N file] [--no-passive] [--no-proxy=list]",
"       [--no-sslv3] [--no-tlsv1] [--no-verify-hostname] [--no-verify-peer]",
"       [-o file] [--referer=URL] [-S bytes] [-T seconds]",
"       [--user-agent=agent-string] [-w seconds] -h host -f file [-c dir]");
}


/*
 * Entry point
 */
int
main(int argc, char *argv[])
{
        struct stat sb;
        struct sigaction sa;
        const char *p, *s;
        char *end, *q;
        int c, e, is_http, r;


        while ((c = getopt_long(argc, argv,
            "146AaB:bc:dFf:Hh:i:lMmN:nPpo:qRrS:sT:tUvw:",
            longopts, NULL)) != -1)
                switch (c) {
                case '1':
                        once_flag = 1;
                        break;
                case '4':
                        family = PF_INET;
                        break;
                case '6':
                        family = PF_INET6;
                        break;
                case 'A':
                        A_flag = 1;
                        break;
                case 'a':
                        a_flag = 1;
                        break;
                case 'B':
                        B_size = (off_t)strtol(optarg, &end, 10);
                        if (*optarg == '\0' || *end != '\0')
                                errx(1, "invalid buffer size (%s)", optarg);
                        break;
                case 'b':
                        warnx("warning: the -b option is deprecated");
                        b_flag = 1;
                        break;
                case 'c':
                        c_dirname = optarg;
                        break;
                case 'd':
                        d_flag = 1;
                        break;
                case 'F':
                        F_flag = 1;
                        break;
                case 'f':
                        f_filename = optarg;
                        break;
                case 'H':
                        warnx("the -H option is now implicit, "
                            "use -U to disable");
                        break;
                case 'h':
                        h_hostname = optarg;
                        break;
                case 'i':
                        i_flag = 1;
                        i_filename = optarg;
                        break;
                case 'l':
                        l_flag = 1;
                        break;
                case 'o':
                        o_flag = 1;
                        o_filename = optarg;
                        break;
                case 'M':
                case 'm':
                        if (r_flag)
                                errx(1, "the -m and -r flags "
                                    "are mutually exclusive");
                        m_flag = 1;
                        break;
                case 'N':
                        N_filename = optarg;
                        break;
                case 'n':
                        n_flag = 1;
                        break;
                case 'P':
                case 'p':
                        p_flag = 1;
                        break;
                case 'q':
                        v_level = 0;
                        break;
                case 'R':
                        R_flag = 1;
                        break;
                case 'r':
                        if (m_flag)
                                errx(1, "the -m and -r flags "
                                    "are mutually exclusive");
                        r_flag = 1;
                        break;
                case 'S':
                        S_size = strtoll(optarg, &end, 10);
                        if (*optarg == '\0' || *end != '\0')
                                errx(1, "invalid size (%s)", optarg);
                        break;
                case 's':
                        s_flag = 1;
                        break;
                case 'T':
                        T_secs = strtol(optarg, &end, 10);
                        if (*optarg == '\0' || *end != '\0')
                                errx(1, "invalid timeout (%s)", optarg);
                        break;
                case 't':
                        t_flag = 1;
                        warnx("warning: the -t option is deprecated");
                        break;
                case 'U':
                        U_flag = 1;
                        break;
                case 'v':
                        v_level++;
                        break;
                case 'w':
                        a_flag = 1;
                        w_secs = strtol(optarg, &end, 10);
                        if (*optarg == '\0' || *end != '\0')
                                errx(1, "invalid delay (%s)", optarg);
                        break;
                case OPTION_BIND_ADDRESS:
                        setenv("FETCH_BIND_ADDRESS", optarg, 1);
                        break;
                case OPTION_NO_FTP_PASSIVE_MODE:
                        setenv("FTP_PASSIVE_MODE", "no", 1);
                        break;
                case OPTION_HTTP_REFERER:
                        setenv("HTTP_REFERER", optarg, 1);
                        break;
                case OPTION_HTTP_USER_AGENT:
                        setenv("HTTP_USER_AGENT", optarg, 1);
                        break;
                case OPTION_NO_PROXY:
                        setenv("NO_PROXY", optarg, 1);
                        break;
                case OPTION_SSL_CA_CERT_FILE:
                        setenv("SSL_CA_CERT_FILE", optarg, 1);
                        break;
                case OPTION_SSL_CA_CERT_PATH:
                        setenv("SSL_CA_CERT_PATH", optarg, 1);
                        break;
                case OPTION_SSL_CLIENT_CERT_FILE:
                        setenv("SSL_CLIENT_CERT_FILE", optarg, 1);
                        break;
                case OPTION_SSL_CLIENT_KEY_FILE:
                        setenv("SSL_CLIENT_KEY_FILE", optarg, 1);
                        break;
                case OPTION_SSL_CRL_FILE:
                        setenv("SSL_CRL_FILE", optarg, 1);
                        break;
                case OPTION_SSL_NO_SSL3:
                        setenv("SSL_NO_SSL3", "", 1);
                        break;
                case OPTION_SSL_NO_TLS1:
                        setenv("SSL_NO_TLS1", "", 1);
                        break;
                case OPTION_SSL_NO_VERIFY_HOSTNAME:
                        setenv("SSL_NO_VERIFY_HOSTNAME", "", 1);
                        break;
                case OPTION_SSL_NO_VERIFY_PEER:
                        setenv("SSL_NO_VERIFY_PEER", "", 1);
                        break;
                default:
                        usage();
                        exit(1);
                }

        argc -= optind;
        argv += optind;

        if (h_hostname || f_filename || c_dirname) {
                if (!h_hostname || !f_filename || argc) {
                        usage();
                        exit(1);
                }
                /* XXX this is a hack. */
                if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
                        errx(1, "invalid hostname");
                if (asprintf(argv, "ftp://%s/%s/%s", h_hostname,
                    c_dirname ? c_dirname : "", f_filename) == -1)
                        errx(1, "%s", strerror(ENOMEM));
                argc++;
        }

        if (!argc) {
                usage();
                exit(1);
        }

        /* allocate buffer */
        if (B_size < MINBUFSIZE)
                B_size = MINBUFSIZE;
        if ((buf = malloc(B_size)) == NULL)
                errx(1, "%s", strerror(ENOMEM));

        /* timeouts */
        if ((s = getenv("FTP_TIMEOUT")) != NULL) {
                ftp_timeout = strtol(s, &end, 10);
                if (*s == '\0' || *end != '\0' || ftp_timeout < 0) {
                        warnx("FTP_TIMEOUT (%s) is not a positive integer", s);
                        ftp_timeout = 0;
                }
        }
        if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
                http_timeout = strtol(s, &end, 10);
                if (*s == '\0' || *end != '\0' || http_timeout < 0) {
                        warnx("HTTP_TIMEOUT (%s) is not a positive integer", s);
                        http_timeout = 0;
                }
        }

        /* signal handling */
        sa.sa_flags = 0;
        sa.sa_handler = sig_handler;
        sigemptyset(&sa.sa_mask);
        sigaction(SIGALRM, &sa, NULL);
        sa.sa_flags = SA_RESETHAND;
        sigaction(SIGINT, &sa, NULL);
        fetchRestartCalls = 0;

        /* output file */
        if (o_flag) {
                if (strcmp(o_filename, "-") == 0) {
                        o_stdout = 1;
                } else if (stat(o_filename, &sb) == -1) {
                        if (errno == ENOENT) {
                                if (argc > 1)
                                        errx(1, "%s is not a directory",
                                            o_filename);
                        } else {
                                err(1, "%s", o_filename);
                        }
                } else {
                        if (sb.st_mode & S_IFDIR)
                                o_directory = 1;
                }
        }

        /* check if output is to a tty (for progress report) */
        v_tty = isatty(STDERR_FILENO);
        v_progress = v_tty && v_level > 0;
        if (v_progress)
                pgrp = getpgrp();

        r = 0;

        /* authentication */
        if (v_tty)
                fetchAuthMethod = query_auth;
        if (N_filename != NULL)
                if (setenv("NETRC", N_filename, 1) == -1)
                        err(1, "setenv: cannot set NETRC=%s", N_filename);

        while (argc) {
                if ((p = strrchr(*argv, '/')) == NULL)
                        p = *argv;
                else
                        p++;

                if (!*p)
                        p = "fetch.out";

                fetchLastErrCode = 0;

                if (o_flag) {
                        if (o_stdout) {
                                e = fetch(*argv, "-", &is_http);
                        } else if (o_directory) {
                                asprintf(&q, "%s/%s", o_filename, p);
                                e = fetch(*argv, q, &is_http);
                                free(q);
                        } else {
                                e = fetch(*argv, o_filename, &is_http);
                        }
                } else {
                        e = fetch(*argv, p, &is_http);
                }

                if (sigint)
                        kill(getpid(), SIGINT);

                if (e == 0 && once_flag)
                        exit(0);

                if (e) {
                        r = 1;
                        if ((fetchLastErrCode
                            && fetchLastErrCode != FETCH_AUTH
                            && fetchLastErrCode != FETCH_UNAVAIL
                            && fetchLastErrCode != FETCH_MOVED
                            && fetchLastErrCode != FETCH_URL
                            && fetchLastErrCode != FETCH_RESOLV
                            && fetchLastErrCode != FETCH_UNKNOWN
                            && (!is_http || (
                                   fetchLastErrCode != FETCH_PROTO
                                && fetchLastErrCode != FETCH_SERVER
                                && fetchLastErrCode != FETCH_TEMP
                                && fetchLastErrCode != FETCH_TIMEOUT
                            )))) {
                                if (w_secs && v_level)
                                        fprintf(stderr, "Waiting %ld seconds "
                                            "before retrying\n", w_secs);
                                if (w_secs)
                                        sleep(w_secs);
                                if (a_flag)
                                        continue;
                        }
                }

                argc--, argv++;
        }

        exit(r);
}
FreeBSD
