713 lines
16 KiB
C
713 lines
16 KiB
C
/*-
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* Copyright (c) 2000 Dag-Erling Coïdan Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <fetch.h>
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#define MINBUFSIZE 4096
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/* Option flags */
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int A_flag; /* -A: do not follow 302 redirects */
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int a_flag; /* -a: auto retry */
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size_t B_size; /* -B: buffer size */
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int b_flag; /*! -b: workaround TCP bug */
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char *c_dirname; /* -c: remote directory */
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int d_flag; /* -d: direct connection */
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int F_flag; /* -F: restart without checking mtime */
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char *f_filename; /* -f: file to fetch */
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int H_flag; /* -H: use high port */
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char *h_hostname; /* -h: host to fetch from */
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int l_flag; /* -l: link rather than copy file: URLs */
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int m_flag; /* -[Mm]: mirror mode */
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int n_flag; /* -n: do not preserve modification time */
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int o_flag; /* -o: specify output file */
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int o_directory; /* output file is a directory */
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char *o_filename; /* name of output file */
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int o_stdout; /* output file is stdout */
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int once_flag; /* -1: stop at first successful file */
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int p_flag; /* -[Pp]: use passive FTP */
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int R_flag; /* -R: don't delete partially transferred files */
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int r_flag; /* -r: restart previously interrupted transfer */
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u_int T_secs = 0; /* -T: transfer timeout in seconds */
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int s_flag; /* -s: show size, don't fetch */
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off_t S_size; /* -S: require size to match */
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int t_flag; /*! -t: workaround TCP bug */
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int v_level = 1; /* -v: verbosity level */
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int v_tty; /* stdout is a tty */
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u_int w_secs; /* -w: retry delay */
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int family = PF_UNSPEC; /* -[46]: address family to use */
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int sigalrm; /* SIGALRM received */
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int sigint; /* SIGINT received */
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u_int ftp_timeout; /* default timeout for FTP transfers */
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u_int http_timeout; /* default timeout for HTTP transfers */
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u_char *buf; /* transfer buffer */
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void
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sig_handler(int sig)
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{
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switch (sig) {
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case SIGALRM:
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sigalrm = 1;
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break;
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case SIGINT:
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sigint = 1;
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break;
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}
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}
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struct xferstat {
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char name[40];
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struct timeval start;
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struct timeval end;
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struct timeval last;
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off_t size;
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off_t offset;
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off_t rcvd;
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};
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void
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stat_display(struct xferstat *xs, int force)
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{
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struct timeval now;
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if (!v_tty || !v_level)
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return;
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gettimeofday(&now, NULL);
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if (!force && now.tv_sec <= xs->last.tv_sec)
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return;
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xs->last = now;
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fprintf(stderr, "\rReceiving %s", xs->name);
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if (xs->size == -1)
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fprintf(stderr, ": %lld bytes", xs->rcvd);
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else
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fprintf(stderr, " (%lld bytes): %d%%", xs->size,
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(int)((100.0 * xs->rcvd) / xs->size));
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}
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void
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stat_start(struct xferstat *xs, char *name, off_t size, off_t offset)
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{
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snprintf(xs->name, sizeof xs->name, "%s", name);
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gettimeofday(&xs->start, NULL);
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xs->last.tv_sec = xs->last.tv_usec = 0;
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xs->end = xs->last;
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xs->size = size;
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xs->offset = offset;
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xs->rcvd = offset;
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stat_display(xs, 1);
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}
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void
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stat_update(struct xferstat *xs, off_t rcvd, int force)
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{
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xs->rcvd = rcvd;
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stat_display(xs, 0);
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}
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void
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stat_end(struct xferstat *xs)
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{
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double delta;
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double bps;
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if (!v_level)
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return;
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gettimeofday(&xs->end, NULL);
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stat_display(xs, 1);
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fputc('\n', stderr);
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delta = (xs->end.tv_sec + (xs->end.tv_usec / 1.e6))
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- (xs->start.tv_sec + (xs->start.tv_usec / 1.e6));
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fprintf(stderr, "%lld bytes transferred in %.1f seconds ",
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xs->rcvd - xs->offset, delta);
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bps = (xs->rcvd - xs->offset) / delta;
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if (bps > 1024*1024)
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fprintf(stderr, "(%.2f MBps)\n", bps / (1024*1024));
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else if (bps > 1024)
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fprintf(stderr, "(%.2f kBps)\n", bps / 1024);
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else
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fprintf(stderr, "(%.2f Bps)\n", bps);
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}
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int
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fetch(char *URL, char *path)
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{
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struct url *url;
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struct url_stat us;
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struct stat sb;
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struct xferstat xs;
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FILE *f, *of;
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size_t size;
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off_t count;
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char flags[8];
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int n, r;
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u_int timeout;
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f = of = NULL;
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/* parse URL */
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if ((url = fetchParseURL(URL)) == NULL) {
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warnx("%s: parse error", URL);
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goto failure;
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}
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timeout = 0;
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*flags = 0;
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count = 0;
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/* common flags */
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if (v_level > 1)
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strcat(flags, "v");
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switch (family) {
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case PF_INET:
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strcat(flags, "4");
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break;
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case PF_INET6:
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strcat(flags, "6");
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break;
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}
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/* FTP specific flags */
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if (strcmp(url->scheme, "ftp") == 0) {
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if (p_flag)
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strcat(flags, "p");
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if (d_flag)
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strcat(flags, "d");
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if (H_flag)
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strcat(flags, "h");
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timeout = T_secs ? T_secs : ftp_timeout;
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}
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/* HTTP specific flags */
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if (strcmp(url->scheme, "http") == 0) {
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if (d_flag)
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strcat(flags, "d");
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if (A_flag)
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strcat(flags, "A");
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timeout = T_secs ? T_secs : http_timeout;
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}
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/* set the protocol timeout. */
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fetchTimeout = timeout;
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/* just print size */
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if (s_flag) {
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if (fetchStat(url, &us, flags) == -1)
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goto failure;
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if (us.size == -1)
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printf("Unknown\n");
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else
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printf("%lld\n", us.size);
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goto success;
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}
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/*
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* If the -r flag was specified, we have to compare the local and
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* remote files, so we should really do a fetchStat() first, but I
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* know of at least one HTTP server that only sends the content
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* size in response to GET requests, and leaves it out of replies
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* to HEAD requests. Also, in the (frequent) case that the local
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* and remote files match but the local file is truncated, we have
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* sufficient information *before* the compare to issue a correct
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* request. Therefore, we always issue a GET request as if we were
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* sure the local file was a truncated copy of the remote file; we
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* can drop the connection later if we change our minds.
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*/
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if (r_flag && !o_stdout && stat(path, &sb) != -1)
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url->offset = sb.st_size;
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else
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sb.st_size = 0;
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/* start the transfer */
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if ((f = fetchXGet(url, &us, flags)) == NULL) {
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warnx("%s: %s", path, fetchLastErrString);
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goto failure;
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}
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if (sigint)
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goto signal;
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/* check that size is as expected */
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if (S_size) {
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if (us.size == -1) {
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warnx("%s: size unknown", path);
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goto failure;
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} else if (us.size != S_size) {
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warnx("%s: size mismatch: expected %lld, actual %lld",
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path, S_size, us.size);
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goto failure;
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}
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}
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/* symlink instead of copy */
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if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
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if (symlink(url->doc, path) == -1) {
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warn("%s: symlink()", path);
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goto failure;
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}
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goto success;
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}
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if (v_level > 1) {
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if (sb.st_size)
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warnx("local: %lld / %ld", sb.st_size, sb.st_mtime);
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warnx("remote: %lld / %ld", us.size, us.mtime);
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}
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/* open output file */
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if (o_stdout) {
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/* output to stdout */
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of = stdout;
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} else if (sb.st_size) {
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/* resume mode, local file exists */
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if (!F_flag && us.mtime && sb.st_mtime != us.mtime) {
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/* no match! have to refetch */
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fclose(f);
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url->offset = 0;
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if ((f = fetchXGet(url, &us, flags)) == NULL) {
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warnx("%s: %s", path, fetchLastErrString);
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goto failure;
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}
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if (sigint)
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goto signal;
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} else {
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if (us.size == sb.st_size)
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/* nothing to do */
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goto success;
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if (sb.st_size > us.size) {
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/* local file too long! */
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warnx("%s: local file (%lld bytes) is longer "
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"than remote file (%lld bytes)",
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path, sb.st_size, us.size);
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goto failure;
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}
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/* we got through, open local file and seek to offset */
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/*
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* XXX there's a race condition here - the file we open is not
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* necessarily the same as the one we stat()'ed earlier...
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*/
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if ((of = fopen(path, "a")) == NULL) {
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warn("%s: fopen()", path);
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goto failure;
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}
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if (fseek(of, url->offset, SEEK_SET) == -1) {
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warn("%s: fseek()", path);
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goto failure;
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}
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}
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}
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if (m_flag && stat(path, &sb) != -1) {
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/* mirror mode, local file exists */
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if (sb.st_size == us.size && sb.st_mtime == us.mtime)
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goto success;
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}
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if (!of) {
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/*
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* We don't yet have an output file; either this is a vanilla
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* run with no special flags, or the local and remote files
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* didn't match.
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*/
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if ((of = fopen(path, "w")) == NULL) {
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warn("%s: open()", path);
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goto failure;
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}
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}
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count = url->offset;
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/* start the counter */
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stat_start(&xs, path, us.size, count);
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sigint = sigalrm = 0;
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/* suck in the data */
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for (n = 0; !sigint && !sigalrm; ++n) {
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if (us.size != -1 && us.size - count < B_size)
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size = us.size - count;
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else
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size = B_size;
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if (timeout)
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alarm(timeout);
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if ((size = fread(buf, 1, size, f)) <= 0)
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break;
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stat_update(&xs, count += size, 0);
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if (fwrite(buf, size, 1, of) != 1)
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break;
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}
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if (timeout)
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alarm(0);
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stat_end(&xs);
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/* Set mtime of local file */
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if (!n_flag && us.mtime && !o_stdout
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&& (stat(path, &sb) != -1) && sb.st_mode & S_IFREG) {
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struct timeval tv[2];
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fflush(of);
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tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime);
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tv[1].tv_sec = (long)us.mtime;
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tv[0].tv_usec = tv[1].tv_usec = 0;
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if (utimes(path, tv))
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warn("%s: utimes()", path);
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}
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/* timed out or interrupted? */
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signal:
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if (sigalrm)
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warnx("transfer timed out");
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if (sigint) {
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warnx("transfer interrupted");
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goto failure;
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}
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if (!sigalrm) {
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/* check the status of our files */
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if (ferror(f))
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warn("%s", URL);
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if (ferror(of))
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warn("%s", path);
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if (ferror(f) || ferror(of))
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goto failure;
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}
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/* did the transfer complete normally? */
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if (us.size != -1 && count < us.size) {
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warnx("%s appears to be truncated: %lld/%lld bytes",
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path, count, us.size);
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goto failure_keep;
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}
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success:
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r = 0;
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goto done;
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failure:
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if (of && of != stdout && !R_flag && !r_flag)
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if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
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unlink(path);
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failure_keep:
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r = -1;
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goto done;
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done:
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if (f)
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fclose(f);
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if (of && of != stdout)
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fclose(of);
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if (url)
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fetchFreeURL(url);
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return r;
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}
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void
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usage(void)
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{
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/* XXX badly out of synch */
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fprintf(stderr,
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"Usage: fetch [-1AFHMPRabdlmnpqrstv] [-o outputfile] [-S bytes]\n"
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" [-B bytes] [-T seconds] [-w seconds]\n"
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" [-f file -h host [-c dir] | URL ...]\n"
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);
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}
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#define PARSENUM(NAME, TYPE) \
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int \
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NAME(char *s, TYPE *v) \
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{ \
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*v = 0; \
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for (*v = 0; *s; s++) \
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if (isdigit(*s)) \
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*v = *v * 10 + *s - '0'; \
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else \
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return -1; \
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return 0; \
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}
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PARSENUM(parseint, u_int)
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PARSENUM(parsesize, size_t)
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PARSENUM(parseoff, off_t)
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int
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main(int argc, char *argv[])
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{
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struct stat sb;
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struct sigaction sa;
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char *p, *q, *s;
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int c, e, r;
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while ((c = getopt(argc, argv,
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"146AaB:bc:dFf:h:lHMmnPpo:qRrS:sT:tvw:")) != EOF)
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switch (c) {
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case '1':
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once_flag = 1;
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break;
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case '4':
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family = PF_INET;
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break;
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case '6':
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family = PF_INET6;
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break;
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case 'A':
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A_flag = 1;
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break;
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case 'a':
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a_flag = 1;
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break;
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case 'B':
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if (parsesize(optarg, &B_size) == -1)
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errx(1, "invalid buffer size");
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break;
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case 'b':
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warnx("warning: the -b option is deprecated");
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b_flag = 1;
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break;
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case 'c':
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c_dirname = optarg;
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break;
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case 'd':
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d_flag = 1;
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break;
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case 'F':
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F_flag = 1;
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break;
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case 'f':
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f_filename = optarg;
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break;
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case 'H':
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H_flag = 1;
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break;
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case 'h':
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h_hostname = optarg;
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break;
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case 'l':
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l_flag = 1;
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break;
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case 'o':
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o_flag = 1;
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o_filename = optarg;
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break;
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case 'M':
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case 'm':
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if (r_flag)
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errx(1, "the -m and -r flags are mutually exclusive");
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m_flag = 1;
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break;
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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':
|
|
if (parseoff(optarg, &S_size) == -1)
|
|
errx(1, "invalid size");
|
|
break;
|
|
case 's':
|
|
s_flag = 1;
|
|
break;
|
|
case 'T':
|
|
if (parseint(optarg, &T_secs) == -1)
|
|
errx(1, "invalid timeout");
|
|
break;
|
|
case 't':
|
|
t_flag = 1;
|
|
warnx("warning: the -t option is deprecated");
|
|
break;
|
|
case 'v':
|
|
v_level++;
|
|
break;
|
|
case 'w':
|
|
a_flag = 1;
|
|
if (parseint(optarg, &w_secs) == -1)
|
|
errx(1, "invalid delay");
|
|
break;
|
|
default:
|
|
usage();
|
|
exit(EX_USAGE);
|
|
}
|
|
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (h_hostname || f_filename || c_dirname) {
|
|
if (!h_hostname || !f_filename || argc) {
|
|
usage();
|
|
exit(EX_USAGE);
|
|
}
|
|
/* 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, strerror(ENOMEM));
|
|
argc++;
|
|
}
|
|
|
|
if (!argc) {
|
|
usage();
|
|
exit(EX_USAGE);
|
|
}
|
|
|
|
/* allocate buffer */
|
|
if (B_size < MINBUFSIZE)
|
|
B_size = MINBUFSIZE;
|
|
if ((buf = malloc(B_size)) == NULL)
|
|
errx(1, strerror(ENOMEM));
|
|
|
|
/* timeouts */
|
|
if ((s = getenv("FTP_TIMEOUT")) != NULL) {
|
|
if (parseint(s, &ftp_timeout) == -1) {
|
|
warnx("FTP_TIMEOUT is not a positive integer");
|
|
ftp_timeout = 0;
|
|
}
|
|
}
|
|
if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
|
|
if (parseint(s, &http_timeout) == -1) {
|
|
warnx("HTTP_TIMEOUT is not a positive integer");
|
|
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(EX_USAGE, "%s is not a directory", o_filename);
|
|
} else {
|
|
err(EX_IOERR, "%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);
|
|
r = 0;
|
|
|
|
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, "-");
|
|
} else if (o_directory) {
|
|
asprintf(&q, "%s/%s", o_filename, p);
|
|
e = fetch(*argv, q);
|
|
free(q);
|
|
} else {
|
|
e = fetch(*argv, o_filename);
|
|
}
|
|
} else {
|
|
e = fetch(*argv, p);
|
|
}
|
|
|
|
if (sigint)
|
|
kill(getpid(), SIGINT);
|
|
|
|
if (e == 0 && once_flag)
|
|
exit(0);
|
|
|
|
if (e) {
|
|
r = 1;
|
|
if ((fetchLastErrCode
|
|
&& fetchLastErrCode != FETCH_UNAVAIL
|
|
&& fetchLastErrCode != FETCH_MOVED
|
|
&& fetchLastErrCode != FETCH_URL
|
|
&& fetchLastErrCode != FETCH_RESOLV
|
|
&& fetchLastErrCode != FETCH_UNKNOWN)) {
|
|
if (w_secs) {
|
|
if (v_level)
|
|
fprintf(stderr, "Waiting %d seconds before retrying\n",
|
|
w_secs);
|
|
sleep(w_secs);
|
|
}
|
|
if (a_flag)
|
|
continue;
|
|
}
|
|
}
|
|
|
|
argc--, argv++;
|
|
}
|
|
|
|
exit(r);
|
|
}
|