freebsd-skq/usr.bin/fetch/fetch.c
Dag-Erling Smørgrav 7c480c6c77 Now that libfetch uses the high port range by default, add a -U option to
make it use the low (default) port range instead.
2001-03-24 00:32:11 +00:00

772 lines
18 KiB
C

/*-
* Copyright (c) 2000 Dag-Erling Coïdan Smørgrav
* 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.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <fetch.h>
#define MINBUFSIZE 4096
/* Option flags */
int A_flag; /* -A: do not follow 302 redirects */
int a_flag; /* -a: auto retry */
size_t B_size; /* -B: buffer size */
int b_flag; /*! -b: workaround TCP bug */
char *c_dirname; /* -c: remote directory */
int d_flag; /* -d: direct connection */
int F_flag; /* -F: restart without checking mtime */
char *f_filename; /* -f: file to fetch */
char *h_hostname; /* -h: host to fetch from */
int l_flag; /* -l: link rather than copy file: URLs */
int m_flag; /* -[Mm]: mirror mode */
int n_flag; /* -n: do not preserve modification time */
int o_flag; /* -o: specify output file */
int o_directory; /* output file is a directory */
char *o_filename; /* name of output file */
int o_stdout; /* output file is stdout */
int once_flag; /* -1: stop at first successful file */
int p_flag; /* -[Pp]: use passive FTP */
int R_flag; /* -R: don't delete partially transferred files */
int r_flag; /* -r: restart previously interrupted transfer */
off_t S_size; /* -S: require size to match */
int s_flag; /* -s: show size, don't fetch */
u_int T_secs = 0; /* -T: transfer timeout in seconds */
int t_flag; /*! -t: workaround TCP bug */
int U_flag; /* -U: do not use high ports */
int v_level = 1; /* -v: verbosity level */
int v_tty; /* stdout is a tty */
u_int w_secs; /* -w: retry delay */
int family = PF_UNSPEC; /* -[46]: address family to use */
int sigalrm; /* SIGALRM received */
int siginfo; /* SIGINFO received */
int sigint; /* SIGINT received */
u_int ftp_timeout; /* default timeout for FTP transfers */
u_int http_timeout; /* default timeout for HTTP transfers */
u_char *buf; /* transfer buffer */
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[40];
struct timeval start;
struct timeval end;
struct timeval last;
off_t size;
off_t offset;
off_t rcvd;
};
void
stat_display(struct xferstat *xs, int force)
{
struct timeval now;
if (!v_tty || !v_level)
return;
gettimeofday(&now, NULL);
if (!force && now.tv_sec <= xs->last.tv_sec)
return;
xs->last = now;
fprintf(stderr, "\rReceiving %s", xs->name);
if (xs->size == -1)
fprintf(stderr, ": %lld bytes", xs->rcvd);
else
fprintf(stderr, " (%lld bytes): %d%%", xs->size,
(int)((100.0 * xs->rcvd) / xs->size));
}
void
stat_start(struct xferstat *xs, char *name, off_t size, off_t offset)
{
snprintf(xs->name, sizeof xs->name, "%s", name);
gettimeofday(&xs->start, NULL);
xs->last.tv_sec = xs->last.tv_usec = 0;
xs->end = xs->last;
xs->size = size;
xs->offset = offset;
xs->rcvd = offset;
stat_display(xs, 1);
}
void
stat_update(struct xferstat *xs, off_t rcvd, int force)
{
xs->rcvd = rcvd;
stat_display(xs, 0);
}
void
stat_end(struct xferstat *xs)
{
double delta;
double bps;
if (!v_level)
return;
gettimeofday(&xs->end, NULL);
stat_display(xs, 1);
fputc('\n', stderr);
delta = (xs->end.tv_sec + (xs->end.tv_usec / 1.e6))
- (xs->start.tv_sec + (xs->start.tv_usec / 1.e6));
fprintf(stderr, "%lld bytes transferred in %.1f seconds ",
xs->rcvd - xs->offset, delta);
bps = (xs->rcvd - xs->offset) / delta;
if (bps > 1024*1024)
fprintf(stderr, "(%.2f MBps)\n", bps / (1024*1024));
else if (bps > 1024)
fprintf(stderr, "(%.2f kBps)\n", bps / 1024);
else
fprintf(stderr, "(%.2f Bps)\n", bps);
}
int
fetch(char *URL, char *path)
{
struct url *url;
struct url_stat us;
struct stat sb;
struct xferstat xs;
FILE *f, *of;
size_t size, wr;
off_t count;
char flags[8];
int n, r;
u_int timeout;
u_char *ptr;
f = of = NULL;
/* parse URL */
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))
strcpy(url->scheme, SCHEME_FTP);
else if (strncasecmp(url->host, "www.", 4))
strcpy(url->scheme, SCHEME_HTTP);
}
timeout = 0;
*flags = 0;
count = 0;
/* common flags */
if (v_level > 1)
strcat(flags, "v");
switch (family) {
case PF_INET:
strcat(flags, "4");
break;
case PF_INET6:
strcat(flags, "6");
break;
}
/* FTP specific flags */
if (strcmp(url->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, "http") == 0) {
if (d_flag)
strcat(flags, "d");
if (A_flag)
strcat(flags, "A");
timeout = T_secs ? T_secs : http_timeout;
}
/* set the protocol timeout. */
fetchTimeout = timeout;
/* just print size */
if (s_flag) {
if (fetchStat(url, &us, flags) == -1)
goto failure;
if (us.size == -1)
printf("Unknown\n");
else
printf("%lld\n", us.size);
goto success;
}
/*
* 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.
*/
if ((r_flag || m_flag) && !o_stdout && stat(path, &sb) != -1) {
if (r_flag)
url->offset = sb.st_size;
} else {
sb.st_size = -1;
}
/* start the transfer */
if ((f = fetchXGet(url, &us, flags)) == NULL) {
warnx("%s: %s", path, fetchLastErrString);
goto failure;
}
if (sigint)
goto signal;
/* check that size is as expected */
if (S_size) {
if (us.size == -1) {
warnx("%s: size unknown", path);
goto failure;
} else if (us.size != S_size) {
warnx("%s: size mismatch: expected %lld, actual %lld",
path, S_size, 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)
warnx("%s: size of remote file is not known", path);
if (v_level > 1) {
if (sb.st_size != -1)
fprintf(stderr, "local size / mtime: %lld / %ld\n",
sb.st_size, sb.st_mtime);
if (us.size != -1)
fprintf(stderr, "remote size / mtime: %lld / %ld\n",
us.size, us.mtime);
}
/* open output file */
if (o_stdout) {
/* output to stdout */
of = stdout;
} else if (sb.st_size != -1) {
/* resume mode, local file exists */
if (!F_flag && us.mtime && sb.st_mtime != us.mtime) {
/* 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;
}
url->offset = 0;
if ((f = fetchXGet(url, &us, flags)) == NULL) {
warnx("%s: %s", path, fetchLastErrString);
goto failure;
}
if (sigint)
goto signal;
} else {
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 (%lld bytes) is longer "
"than remote file (%lld bytes)",
path, sb.st_size, us.size);
goto failure;
}
/* we got through, open local file and seek to offset */
/*
* XXX there's a race condition here - the file we open is not
* necessarily the same as the one we stat()'ed earlier...
*/
if ((of = fopen(path, "a")) == NULL) {
warn("%s: fopen()", path);
goto failure;
}
if (fseek(of, url->offset, SEEK_SET) == -1) {
warn("%s: fseek()", path);
goto failure;
}
}
}
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) {
/*
* 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 ((of = fopen(path, "w")) == 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 */
signal(SIGINFO, sig_handler);
for (n = 0; !sigint && !sigalrm; ++n) {
if (us.size != -1 && us.size - count < B_size)
size = us.size - count;
else
size = B_size;
if (timeout)
alarm(timeout);
if ((size = fread(buf, 1, size, f)) == 0) {
if (ferror(f) && errno == EINTR && !sigalrm && !sigint)
clearerr(f);
else
break;
}
if (timeout)
alarm(0);
if (siginfo) {
stat_end(&xs);
siginfo = 0;
}
stat_update(&xs, count += size, 0);
for (ptr = buf; size > 0; ptr += wr, size -= wr)
if ((wr = fwrite(ptr, 1, size, of)) < size) {
if (ferror(of) && errno == EINTR && !sigalrm && !sigint)
clearerr(of);
else
break;
}
if (size != 0)
break;
}
signal(SIGINFO, SIG_DFL);
if (timeout)
alarm(0);
stat_end(&xs);
/* set mtime of local file */
if (!n_flag && us.mtime && !o_stdout
&& (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(path, tv))
warn("%s: utimes()", path);
}
/* timed out or interrupted? */
signal:
if (sigalrm)
warnx("transfer timed out");
if (sigint) {
warnx("transfer interrupted");
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: %lld/%lld bytes",
path, count, us.size);
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;
goto done;
failure:
if (of && of != stdout && !R_flag && !r_flag)
if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
unlink(path);
failure_keep:
r = -1;
goto done;
done:
if (f)
fclose(f);
if (of && of != stdout)
fclose(of);
if (url)
fetchFreeURL(url);
return r;
}
void
usage(void)
{
/* XXX badly out of synch */
fprintf(stderr,
"Usage: fetch [-1AFHMPRabdlmnpqrstv] [-o outputfile] [-S bytes]\n"
" [-B bytes] [-T seconds] [-w seconds]\n"
" [-f file -h host [-c dir] | URL ...]\n"
);
}
#define PARSENUM(NAME, TYPE) \
int \
NAME(char *s, TYPE *v) \
{ \
*v = 0; \
for (*v = 0; *s; s++) \
if (isdigit(*s)) \
*v = *v * 10 + *s - '0'; \
else \
return -1; \
return 0; \
}
PARSENUM(parseint, u_int)
PARSENUM(parsesize, size_t)
PARSENUM(parseoff, off_t)
int
main(int argc, char *argv[])
{
struct stat sb;
struct sigaction sa;
char *p, *q, *s;
int c, e, r;
while ((c = getopt(argc, argv,
"146AaB:bc:dFf:Hh:lMmnPpo:qRrS:sT:tUvw:")) != EOF)
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':
if (parsesize(optarg, &B_size) == -1)
errx(1, "invalid buffer size");
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\n");
break;
case 'h':
h_hostname = 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_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 'U':
U_flag = 1;
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, "%s", 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, "%s", 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);
}