/*
 * Copyright (c) 1985, 1989, 1993, 1994
 *      The Regents of the University of California.  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.
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

/*
 * FTP User Program -- Command Interface.
 */

#include "ftp_locl.h"
#include <getarg.h>

RCSID("$Id$");

static int help_flag;
static int version_flag;
static int debug_flag;

struct getargs getargs[] = {
    { NULL,     'd', arg_flag, &debug_flag,
      "debug", NULL },
    { NULL,     'g', arg_negative_flag, &doglob,
      "disables globbing", NULL},
    { NULL,     'i', arg_negative_flag, &interactive,
      "Turn off interactive prompting", NULL},
    { NULL,     'l', arg_negative_flag, &lineedit,
      "Turn off line editing", NULL},
    { NULL,   'n', arg_negative_flag, &autologin,
      "Turn off auto-login", NULL},
    { NULL,     'p', arg_flag, &passivemode,
      "passive mode", NULL},
    { NULL,     't', arg_counter, &trace,
      "Packet tracing", NULL},
#ifdef KRB5
    { "gss-bindings", 0,  arg_negative_flag, &ftp_do_gss_bindings,
      "Don't use GSS-API bindings", NULL},
    { "gss-delegate", 0,  arg_negative_flag, &ftp_do_gss_delegate,
      "Disable delegation of GSS-API credentials", NULL},
#endif
    { NULL,     'v', arg_counter, &verbose,
      "verbosity", NULL},
    { NULL,     'K', arg_negative_flag, &use_kerberos,
      "Disable kerberos authentication", NULL},
    { "encrypt", 'x', arg_flag, &doencrypt,
      "Encrypt command and data channel if possible" },
    { "version", 0,  arg_flag, &version_flag },
    { "help",   'h', arg_flag, &help_flag },
};

static int num_args = sizeof(getargs) / sizeof(getargs[0]);

static void
usage(int ecode)
{
    arg_printusage(getargs, num_args, NULL, "[host [port]]");
    exit(ecode);
}

int
main(int argc, char **argv)
{
        int top;
        struct passwd *pw = NULL;
        char homedir[MaxPathLen];
        struct servent *sp;
        int optind = 0;

        setprogname(argv[0]);

        sp = getservbyname("ftp", "tcp");
        if (sp == 0)
                errx(1, "ftp/tcp: unknown service");
        doglob = 1;
        interactive = 1;
        autologin = 1;
        lineedit = 1;
        passivemode = 0; /* passive mode not active */
        use_kerberos = 1;
#ifdef KRB5
        ftp_do_gss_bindings = 1;
#endif

        if(getarg(getargs, num_args, argc, argv, &optind))
                usage(1);
        if(help_flag)
                usage(0);
        if(version_flag) {
                print_version(NULL);
                exit(0);
        }

        if (debug_flag) {
                options |= SO_DEBUG;
                debug++;
        }

        argc -= optind;
        argv += optind;

        fromatty = isatty(fileno(stdin));
        if (fromatty)
                verbose++;
        cpend = 0;      /* no pending replies */
        proxy = 0;      /* proxy not active */
        crflag = 1;     /* strip c.r. on ascii gets */
        sendport = -1;  /* not using ports */
        /*
         * Set up the home directory in case we're globbing.
         */
        pw = k_getpwuid(getuid());
        if (pw != NULL) {
                strlcpy(homedir, pw->pw_dir, sizeof(homedir));
                home = homedir;
        }
        if (argc > 0) {
            char *xargv[5];

            if (setjmp(toplevel))
                exit(0);
            signal(SIGINT, intr);
            signal(SIGPIPE, lostpeer);
            xargv[0] = (char*)getprogname();
            xargv[1] = argv[0];
            xargv[2] = argv[1];
            xargv[3] = argv[2];
            xargv[4] = NULL;
            setpeer(argc+1, xargv);
        }
        if(setjmp(toplevel) == 0)
            top = 1;
        else
            top = 0;
        if (top) {
            signal(SIGINT, intr);
            signal(SIGPIPE, lostpeer);
        }
        for (;;) {
            cmdscanner(top);
            top = 1;
        }
}

void
intr(int sig)
{

        longjmp(toplevel, 1);
}

#ifndef SHUT_RDWR
#define SHUT_RDWR 2
#endif

RETSIGTYPE
lostpeer(int sig)
{

    if (connected) {
        if (cout != NULL) {
            shutdown(fileno(cout), SHUT_RDWR);
            fclose(cout);
            cout = NULL;
        }
        if (data >= 0) {
            shutdown(data, SHUT_RDWR);
            close(data);
            data = -1;
        }
        connected = 0;
    }
    pswitch(1);
    if (connected) {
        if (cout != NULL) {
            shutdown(fileno(cout), SHUT_RDWR);
            fclose(cout);
            cout = NULL;
        }
        connected = 0;
    }
    proxflag = 0;
    pswitch(0);
    sec_end();
    SIGRETURN(0);
}

/*
char *
tail(filename)
        char *filename;
{
        char *s;

        while (*filename) {
                s = strrchr(filename, '/');
                if (s == NULL)
                        break;
                if (s[1])
                        return (s + 1);
                *s = '\0';
        }
        return (filename);
}
*/

static char *
simple_readline(char *prompt)
{
    char buf[BUFSIZ];
    printf ("%s", prompt);
    fflush (stdout);
    if(fgets(buf, sizeof(buf), stdin) == NULL)
        return NULL;
    if (buf[strlen(buf) - 1] == '\n')
        buf[strlen(buf) - 1] = '\0';
    return strdup(buf);
}

#ifndef HAVE_READLINE

static char *
readline(char *prompt)
{
    return simple_readline (prompt);
}

static void
add_history(char *p)
{
}

#else

/* These should not really be here */

char *readline(char *);
void add_history(char *);

#endif

/*
 * Command parser.
 */
void
cmdscanner(int top)
{
    struct cmd *c;
    int l;

    if (!top)
        putchar('\n');
    for (;;) {
        if (fromatty) {
            char *p;
            if (lineedit)
                p = readline("ftp> ");
            else
                p = simple_readline("ftp> ");
            if(p == NULL) {
                printf("\n");
                quit(0, 0);
            }
            strlcpy(line, p, sizeof(line));
            if (lineedit)
                add_history(p);
            free(p);
        } else{
            if (fgets(line, sizeof line, stdin) == NULL)
                quit(0, 0);
        }
        /* XXX will break on long lines */
        l = strlen(line);
        if (l == 0)
            break;
        if (line[--l] == '\n') {
            if (l == 0)
                break;
            line[l] = '\0';
        } else if (l == sizeof(line) - 2) {
            printf("sorry, input line too long\n");
            while ((l = getchar()) != '\n' && l != EOF)
                /* void */;
            break;
        } /* else it was a line without a newline */
        makeargv();
        if (margc == 0) {
            continue;
        }
        c = getcmd(margv[0]);
        if (c == (struct cmd *)-1) {
            printf("?Ambiguous command\n");
            continue;
        }
        if (c == 0) {
            printf("?Invalid command\n");
            continue;
        }
        if (c->c_conn && !connected) {
            printf("Not connected.\n");
            continue;
        }
        (*c->c_handler)(margc, margv);
        if (bell && c->c_bell)
            putchar('\007');
        if (c->c_handler != help)
            break;
    }
    signal(SIGINT, intr);
    signal(SIGPIPE, lostpeer);
}

struct cmd *
getcmd(char *name)
{
        char *p, *q;
        struct cmd *c, *found;
        int nmatches, longest;

        longest = 0;
        nmatches = 0;
        found = 0;
        for (c = cmdtab; (p = c->c_name); c++) {
                for (q = name; *q == *p++; q++)
                        if (*q == 0)            /* exact match? */
                                return (c);
                if (!*q) {                      /* the name was a prefix */
                        if (q - name > longest) {
                                longest = q - name;
                                nmatches = 1;
                                found = c;
                        } else if (q - name == longest)
                                nmatches++;
                }
        }
        if (nmatches > 1)
                return ((struct cmd *)-1);
        return (found);
}

/*
 * Slice a string up into argc/argv.
 */

int slrflag;

void
makeargv(void)
{
        char **argp;

        argp = margv;
        stringbase = line;              /* scan from first of buffer */
        argbase = argbuf;               /* store from first of buffer */
        slrflag = 0;
        for (margc = 0; ; margc++) {
                /* Expand array if necessary */
                if (margc == margvlen) {
                        int i;

                        margv = (margvlen == 0)
                                ? (char **)malloc(20 * sizeof(char *))
                                : (char **)realloc(margv,
                                        (margvlen + 20)*sizeof(char *));
                        if (margv == NULL)
                                errx(1, "cannot realloc argv array");
                        for(i = margvlen; i < margvlen + 20; ++i)
                                margv[i] = NULL;
                        margvlen += 20;
                        argp = margv + margc;
                }

                if ((*argp++ = slurpstring()) == NULL)
                        break;
        }

}

/*
 * Parse string into argbuf;
 * implemented with FSM to
 * handle quoting and strings
 */
char *
slurpstring(void)
{
        int got_one = 0;
        char *sb = stringbase;
        char *ap = argbase;
        char *tmp = argbase;            /* will return this if token found */

        if (*sb == '!' || *sb == '$') { /* recognize ! as a token for shell */
                switch (slrflag) {      /* and $ as token for macro invoke */
                        case 0:
                                slrflag++;
                                stringbase++;
                                return ((*sb == '!') ? "!" : "$");
                                /* NOTREACHED */
                        case 1:
                                slrflag++;
                                altarg = stringbase;
                                break;
                        default:
                                break;
                }
        }

S0:
        switch (*sb) {

        case '\0':
                goto OUT;

        case ' ':
        case '\t':
                sb++; goto S0;

        default:
                switch (slrflag) {
                        case 0:
                                slrflag++;
                                break;
                        case 1:
                                slrflag++;
                                altarg = sb;
                                break;
                        default:
                                break;
                }
                goto S1;
        }

S1:
        switch (*sb) {

        case ' ':
        case '\t':
        case '\0':
                goto OUT;       /* end of token */

        case '\\':
                sb++; goto S2;  /* slurp next character */

        case '"':
                sb++; goto S3;  /* slurp quoted string */

        default:
                *ap++ = *sb++;  /* add character to token */
                got_one = 1;
                goto S1;
        }

S2:
        switch (*sb) {

        case '\0':
                goto OUT;

        default:
                *ap++ = *sb++;
                got_one = 1;
                goto S1;
        }

S3:
        switch (*sb) {

        case '\0':
                goto OUT;

        case '"':
                sb++; goto S1;

        default:
                *ap++ = *sb++;
                got_one = 1;
                goto S3;
        }

OUT:
        if (got_one)
                *ap++ = '\0';
        argbase = ap;                   /* update storage pointer */
        stringbase = sb;                /* update scan pointer */
        if (got_one) {
                return (tmp);
        }
        switch (slrflag) {
                case 0:
                        slrflag++;
                        break;
                case 1:
                        slrflag++;
                        altarg = (char *) 0;
                        break;
                default:
                        break;
        }
        return NULL;
}

#define HELPINDENT ((int) sizeof ("directory"))

/*
 * Help command.
 * Call each command handler with argc == 0 and argv[0] == name.
 */
void
help(int argc, char **argv)
{
        struct cmd *c;

        if (argc == 1) {
                int i, j, w, k;
                int columns, width = 0, lines;

                printf("Commands may be abbreviated.  Commands are:\n\n");
                for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
                        int len = strlen(c->c_name);

                        if (len > width)
                                width = len;
                }
                width = (width + 8) &~ 7;
                columns = 80 / width;
                if (columns == 0)
                        columns = 1;
                lines = (NCMDS + columns - 1) / columns;
                for (i = 0; i < lines; i++) {
                        for (j = 0; j < columns; j++) {
                                c = cmdtab + j * lines + i;
                                if ((!proxy || c->c_proxy)) {
                                        printf("%s", c->c_name);
                                } else {
                                        for (k=0; k < strlen(c->c_name); k++) {
                                                putchar(' ');
                                        }
                                }
                                if (c + lines >= &cmdtab[NCMDS]) {
                                        printf("\n");
                                        break;
                                }
                                w = strlen(c->c_name);
                                while (w < width) {
                                        w = (w + 8) &~ 7;
                                        putchar('\t');
                                }
                        }
                }
                return;
        }
        while (--argc > 0) {
                char *arg;
                arg = *++argv;
                c = getcmd(arg);
                if (c == (struct cmd *)-1)
                        printf("?Ambiguous help command %s\n", arg);
                else if (c == (struct cmd *)0)
                        printf("?Invalid help command %s\n", arg);
                else
                        printf("%-*s\t%s\n", HELPINDENT,
                                c->c_name, c->c_help);
        }
}