/* vi: set sw=4 ts=4: */ /* * wget - retrieve a file using HTTP or FTP * * Chip Rosenthal Covad Communications * */ /* We want libc to give us xxx64 functions also */ /* http://www.unix.org/version2/whatsnew/lfs20mar.html */ #define _LARGEFILE64_SOURCE 1 #include "busybox.h" #include /* for struct option */ struct host_info { // May be used if we ever will want to free() all xstrdup()s... /* char *allocated; */ char *host; int port; char *path; int is_ftp; char *user; }; static void parse_url(char *url, struct host_info *h); static FILE *open_socket(len_and_sockaddr *lsa); static char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc); static int ftpcmd(char *s1, char *s2, FILE *fp, char *buf); /* Globals (can be accessed from signal handlers */ static off_t content_len; /* Content-length of the file */ static off_t beg_range; /* Range at which continue begins */ #if ENABLE_FEATURE_WGET_STATUSBAR static off_t transferred; /* Number of bytes transferred so far */ #endif static int chunked; /* chunked transfer encoding */ #if ENABLE_FEATURE_WGET_STATUSBAR static void progressmeter(int flag); static char *curfile; /* Name of current file being transferred */ static struct timeval start; /* Time a transfer started */ enum { STALLTIME = 5 /* Seconds when xfer considered "stalled" */ }; #else static void progressmeter(int flag) {} #endif /* Read NMEMB elements of SIZE bytes into PTR from STREAM. Returns the * number of elements read, and a short count if an eof or non-interrupt * error is encountered. */ static size_t safe_fread(void *ptr, size_t size, size_t nmemb, FILE *stream) { size_t ret = 0; do { clearerr(stream); ret += fread((char *)ptr + (ret * size), size, nmemb - ret, stream); } while (ret < nmemb && ferror(stream) && errno == EINTR); return ret; } /* Read a line or SIZE - 1 bytes into S, whichever is less, from STREAM. * Returns S, or NULL if an eof or non-interrupt error is encountered. */ static char *safe_fgets(char *s, int size, FILE *stream) { char *ret; do { clearerr(stream); ret = fgets(s, size, stream); } while (ret == NULL && ferror(stream) && errno == EINTR); return ret; } #if ENABLE_FEATURE_WGET_AUTHENTICATION /* * Base64-encode character string and return the string. */ static char *base64enc(unsigned char *p, char *buf, int len) { bb_uuencode(p, buf, len, bb_uuenc_tbl_base64); return buf; } #endif int wget_main(int argc, char **argv) { char buf[512]; struct host_info server, target; len_and_sockaddr *lsa; int n, status; int port; int try = 5; unsigned opt; char *s; char *proxy = 0; char *dir_prefix = NULL; #if ENABLE_FEATURE_WGET_LONG_OPTIONS char *extra_headers = NULL; llist_t *headers_llist = NULL; #endif /* server.allocated = target.allocated = NULL; */ FILE *sfp = NULL; /* socket to web/ftp server */ FILE *dfp = NULL; /* socket to ftp server (data) */ char *fname_out = NULL; /* where to direct output (-O) */ int got_clen = 0; /* got content-length: from server */ int output_fd = -1; int use_proxy = 1; /* Use proxies if env vars are set */ const char *proxy_flag = "on"; /* Use proxies if env vars are set */ const char *user_agent = "Wget";/* Content of the "User-Agent" header field */ /* * Crack command line. */ enum { WGET_OPT_CONTINUE = 0x1, WGET_OPT_QUIET = 0x2, WGET_OPT_OUTNAME = 0x4, WGET_OPT_PREFIX = 0x8, WGET_OPT_PROXY = 0x10, WGET_OPT_USER_AGENT = 0x20, WGET_OPT_PASSIVE = 0x40, WGET_OPT_HEADER = 0x80, }; #if ENABLE_FEATURE_WGET_LONG_OPTIONS static const struct option wget_long_options[] = { // name, has_arg, flag, val { "continue", no_argument, NULL, 'c' }, { "quiet", no_argument, NULL, 'q' }, { "output-document", required_argument, NULL, 'O' }, { "directory-prefix", required_argument, NULL, 'P' }, { "proxy", required_argument, NULL, 'Y' }, { "user-agent", required_argument, NULL, 'U' }, { "passive-ftp", no_argument, NULL, 0xff }, { "header", required_argument, NULL, 0xfe }, { 0, 0, 0, 0 } }; applet_long_options = wget_long_options; #endif opt_complementary = "-1" USE_FEATURE_WGET_LONG_OPTIONS(":\xfe::"); opt = getopt32(argc, argv, "cqO:P:Y:U:", &fname_out, &dir_prefix, &proxy_flag, &user_agent USE_FEATURE_WGET_LONG_OPTIONS(, &headers_llist) ); if (strcmp(proxy_flag, "off") == 0) { /* Use the proxy if necessary. */ use_proxy = 0; } #if ENABLE_FEATURE_WGET_LONG_OPTIONS if (headers_llist) { int size = 1; char *cp; llist_t *ll = headers_llist = rev_llist(headers_llist); while (ll) { size += strlen(ll->data) + 2; ll = ll->link; } extra_headers = cp = xmalloc(size); while (headers_llist) { cp += sprintf(cp, "%s\r\n", headers_llist->data); headers_llist = headers_llist->link; } } #endif parse_url(argv[optind], &target); server.host = target.host; server.port = target.port; /* * Use the proxy if necessary. */ if (use_proxy) { proxy = getenv(target.is_ftp ? "ftp_proxy" : "http_proxy"); if (proxy && *proxy) { parse_url(proxy, &server); } else { use_proxy = 0; } } /* Guess an output filename */ if (!fname_out) { // Dirty hack. Needed because bb_get_last_path_component // will destroy trailing / by storing '\0' in last byte! if (!last_char_is(target.path, '/')) { fname_out = #if ENABLE_FEATURE_WGET_STATUSBAR curfile = #endif bb_get_last_path_component(target.path); } if (!fname_out || !fname_out[0]) { fname_out = #if ENABLE_FEATURE_WGET_STATUSBAR curfile = #endif "index.html"; } if (dir_prefix != NULL) fname_out = concat_path_file(dir_prefix, fname_out); #if ENABLE_FEATURE_WGET_STATUSBAR } else { curfile = bb_get_last_path_component(fname_out); #endif } /* Impossible? if ((opt & WGET_OPT_CONTINUE) && !fname_out) bb_error_msg_and_die("cannot specify continue (-c) without a filename (-O)"); */ /* * Determine where to start transfer. */ if (LONE_DASH(fname_out)) { output_fd = 1; opt &= ~WGET_OPT_CONTINUE; } if (opt & WGET_OPT_CONTINUE) { output_fd = open(fname_out, O_WRONLY); if (output_fd >= 0) { beg_range = xlseek(output_fd, 0, SEEK_END); } /* File doesn't exist. We do not create file here yet. We are not sure it exists on remove side */ } /* We want to do exactly _one_ DNS lookup, since some * sites (i.e. ftp.us.debian.org) use round-robin DNS * and we want to connect to only one IP... */ lsa = host2sockaddr(server.host, server.port); if (!(opt & WGET_OPT_QUIET)) { fprintf(stderr, "Connecting to %s (%s)\n", server.host, xmalloc_sockaddr2dotted(&lsa->sa, lsa->len)); /* We leak result of xmalloc_sockaddr2dotted */ } if (use_proxy || !target.is_ftp) { /* * HTTP session */ do { got_clen = chunked = 0; if (!--try) bb_error_msg_and_die("too many redirections"); /* * Open socket to http server */ if (sfp) fclose(sfp); sfp = open_socket(lsa); /* * Send HTTP request. */ if (use_proxy) { fprintf(sfp, "GET %stp://%s/%s HTTP/1.1\r\n", target.is_ftp ? "f" : "ht", target.host, target.path); } else { fprintf(sfp, "GET /%s HTTP/1.1\r\n", target.path); } fprintf(sfp, "Host: %s\r\nUser-Agent: %s\r\n", target.host, user_agent); #if ENABLE_FEATURE_WGET_AUTHENTICATION if (target.user) { fprintf(sfp, "Authorization: Basic %s\r\n", base64enc((unsigned char*)target.user, buf, sizeof(buf))); } if (use_proxy && server.user) { fprintf(sfp, "Proxy-Authorization: Basic %s\r\n", base64enc((unsigned char*)server.user, buf, sizeof(buf))); } #endif if (beg_range) fprintf(sfp, "Range: bytes=%"OFF_FMT"d-\r\n", beg_range); #if ENABLE_FEATURE_WGET_LONG_OPTIONS if (extra_headers) fputs(extra_headers, sfp); #endif fprintf(sfp, "Connection: close\r\n\r\n"); /* * Retrieve HTTP response line and check for "200" status code. */ read_response: if (fgets(buf, sizeof(buf), sfp) == NULL) bb_error_msg_and_die("no response from server"); s = buf; while (*s != '\0' && !isspace(*s)) ++s; s = skip_whitespace(s); // FIXME: no error check // xatou wouldn't work: "200 OK" status = atoi(s); switch (status) { case 0: case 100: while (gethdr(buf, sizeof(buf), sfp, &n) != NULL) /* eat all remaining headers */; goto read_response; case 200: break; case 300: /* redirection */ case 301: case 302: case 303: break; case 206: if (beg_range) break; /*FALLTHRU*/ default: /* Show first line only and kill any ESC tricks */ buf[strcspn(buf, "\n\r\x1b")] = '\0'; bb_error_msg_and_die("server returned error: %s", buf); } /* * Retrieve HTTP headers. */ while ((s = gethdr(buf, sizeof(buf), sfp, &n)) != NULL) { if (strcasecmp(buf, "content-length") == 0) { content_len = BB_STRTOOFF(s, NULL, 10); if (errno || content_len < 0) { bb_error_msg_and_die("content-length %s is garbage", s); } got_clen = 1; continue; } if (strcasecmp(buf, "transfer-encoding") == 0) { if (strcasecmp(s, "chunked") != 0) bb_error_msg_and_die("server wants to do %s transfer encoding", s); chunked = got_clen = 1; } if (strcasecmp(buf, "location") == 0) { if (s[0] == '/') /* free(target.allocated); */ target.path = /* target.allocated = */ xstrdup(s+1); else { parse_url(s, &target); if (use_proxy == 0) { server.host = target.host; server.port = target.port; } free(lsa); lsa = host2sockaddr(server.host, server.port); break; } } } } while (status >= 300); dfp = sfp; } else { /* * FTP session */ if (!target.user) target.user = xstrdup("anonymous:busybox@"); sfp = open_socket(lsa); if (ftpcmd(NULL, NULL, sfp, buf) != 220) bb_error_msg_and_die("%s", buf+4); /* * Splitting username:password pair, * trying to log in */ s = strchr(target.user, ':'); if (s) *(s++) = '\0'; switch (ftpcmd("USER ", target.user, sfp, buf)) { case 230: break; case 331: if (ftpcmd("PASS ", s, sfp, buf) == 230) break; /* FALLTHRU (failed login) */ default: bb_error_msg_and_die("ftp login: %s", buf+4); } ftpcmd("TYPE I", NULL, sfp, buf); /* * Querying file size */ if (ftpcmd("SIZE ", target.path, sfp, buf) == 213) { content_len = BB_STRTOOFF(buf+4, NULL, 10); if (errno || content_len < 0) { bb_error_msg_and_die("SIZE value is garbage"); } got_clen = 1; } /* * Entering passive mode */ if (ftpcmd("PASV", NULL, sfp, buf) != 227) { pasv_error: bb_error_msg_and_die("bad response to %s: %s", "PASV", buf); } // Response is "227 garbageN1,N2,N3,N4,P1,P2[)garbage] // Server's IP is N1.N2.N3.N4 (we ignore it) // Server's port for data connection is P1*256+P2 s = strrchr(buf, ')'); if (s) s[0] = '\0'; s = strrchr(buf, ','); if (!s) goto pasv_error; port = xatou_range(s+1, 0, 255); *s = '\0'; s = strrchr(buf, ','); if (!s) goto pasv_error; port += xatou_range(s+1, 0, 255) * 256; set_nport(lsa, htons(port)); dfp = open_socket(lsa); if (beg_range) { sprintf(buf, "REST %"OFF_FMT"d", beg_range); if (ftpcmd(buf, NULL, sfp, buf) == 350) content_len -= beg_range; } if (ftpcmd("RETR ", target.path, sfp, buf) > 150) bb_error_msg_and_die("bad response to RETR: %s", buf); } /* * Retrieve file */ if (chunked) { fgets(buf, sizeof(buf), dfp); content_len = STRTOOFF(buf, NULL, 16); /* FIXME: error check?? */ } /* Do it before progressmeter (want to have nice error message) */ if (output_fd < 0) output_fd = xopen(fname_out, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC); if (!(opt & WGET_OPT_QUIET)) progressmeter(-1); do { while (content_len > 0 || !got_clen) { unsigned rdsz = sizeof(buf); if (content_len < sizeof(buf) && (chunked || got_clen)) rdsz = (unsigned)content_len; n = safe_fread(buf, 1, rdsz, dfp); if (n <= 0) break; if (full_write(output_fd, buf, n) != n) { bb_perror_msg_and_die(bb_msg_write_error); } #if ENABLE_FEATURE_WGET_STATUSBAR transferred += n; #endif if (got_clen) { content_len -= n; } } if (chunked) { safe_fgets(buf, sizeof(buf), dfp); /* This is a newline */ safe_fgets(buf, sizeof(buf), dfp); content_len = STRTOOFF(buf, NULL, 16); /* FIXME: error check? */ if (content_len == 0) { chunked = 0; /* all done! */ } } if (n == 0 && ferror(dfp)) { bb_perror_msg_and_die(bb_msg_read_error); } } while (chunked); if (!(opt & WGET_OPT_QUIET)) progressmeter(1); if ((use_proxy == 0) && target.is_ftp) { fclose(dfp); if (ftpcmd(NULL, NULL, sfp, buf) != 226) bb_error_msg_and_die("ftp error: %s", buf+4); ftpcmd("QUIT", NULL, sfp, buf); } exit(EXIT_SUCCESS); } static void parse_url(char *src_url, struct host_info *h) { char *url, *p, *sp; /* h->allocated = */ url = xstrdup(src_url); if (strncmp(url, "http://", 7) == 0) { h->port = bb_lookup_port("http", "tcp", 80); h->host = url + 7; h->is_ftp = 0; } else if (strncmp(url, "ftp://", 6) == 0) { h->port = bb_lookup_port("ftp", "tcp", 21); h->host = url + 6; h->is_ftp = 1; } else bb_error_msg_and_die("not an http or ftp url: %s", url); // FYI: // "Real" wget 'http://busybox.net?var=a/b' sends this request: // 'GET /?var=a/b HTTP 1.0' // and saves 'index.html?var=a%2Fb' (we save 'b') // wget 'http://busybox.net?login=john@doe': // request: 'GET /?login=john@doe HTTP/1.0' // saves: 'index.html?login=john@doe' (we save '?login=john@doe') // wget 'http://busybox.net#test/test': // request: 'GET / HTTP/1.0' // saves: 'index.html' (we save 'test') // // We also don't add unique .N suffix if file exists... sp = strchr(h->host, '/'); p = strchr(h->host, '?'); if (!sp || (p && sp > p)) sp = p; p = strchr(h->host, '#'); if (!sp || (p && sp > p)) sp = p; if (!sp) { h->path = ""; } else if (*sp == '/') { *sp = '\0'; h->path = sp + 1; } else { // '#' or '?' // http://busybox.net?login=john@doe is a valid URL // memmove converts to: // http:/busybox.nett?login=john@doe... memmove(h->host-1, h->host, sp - h->host); h->host--; sp[-1] = '\0'; h->path = sp; } sp = strrchr(h->host, '@'); h->user = NULL; if (sp != NULL) { h->user = h->host; *sp = '\0'; h->host = sp + 1; } sp = h->host; } static FILE *open_socket(len_and_sockaddr *lsa) { FILE *fp; /* glibc 2.4 seems to try seeking on it - ??! */ /* hopefully it understands what ESPIPE means... */ fp = fdopen(xconnect_stream(lsa), "r+"); if (fp == NULL) bb_perror_msg_and_die("fdopen"); return fp; } static char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc) { char *s, *hdrval; int c; *istrunc = 0; /* retrieve header line */ if (fgets(buf, bufsiz, fp) == NULL) return NULL; /* see if we are at the end of the headers */ for (s = buf; *s == '\r'; ++s) ; if (s[0] == '\n') return NULL; /* convert the header name to lower case */ for (s = buf; isalnum(*s) || *s == '-'; ++s) *s = tolower(*s); /* verify we are at the end of the header name */ if (*s != ':') bb_error_msg_and_die("bad header line: %s", buf); /* locate the start of the header value */ for (*s++ = '\0'; *s == ' ' || *s == '\t'; ++s) ; hdrval = s; /* locate the end of header */ while (*s != '\0' && *s != '\r' && *s != '\n') ++s; /* end of header found */ if (*s != '\0') { *s = '\0'; return hdrval; } /* Rats! The buffer isn't big enough to hold the entire header value. */ while (c = getc(fp), c != EOF && c != '\n') ; *istrunc = 1; return hdrval; } static int ftpcmd(char *s1, char *s2, FILE *fp, char *buf) { int result; if (s1) { if (!s2) s2 = ""; fprintf(fp, "%s%s\r\n", s1, s2); fflush(fp); } do { char *buf_ptr; if (fgets(buf, 510, fp) == NULL) { bb_perror_msg_and_die("error getting response"); } buf_ptr = strstr(buf, "\r\n"); if (buf_ptr) { *buf_ptr = '\0'; } } while (!isdigit(buf[0]) || buf[3] != ' '); buf[3] = '\0'; result = xatoi_u(buf); buf[3] = ' '; return result; } #if ENABLE_FEATURE_WGET_STATUSBAR /* Stuff below is from BSD rcp util.c, as added to openshh. * Original copyright notice is retained at the end of this file. */ static int getttywidth(void) { int width; get_terminal_width_height(0, &width, NULL); return width; } static void updateprogressmeter(int ignore) { int save_errno = errno; progressmeter(0); errno = save_errno; } static void alarmtimer(int iwait) { struct itimerval itv; itv.it_value.tv_sec = iwait; itv.it_value.tv_usec = 0; itv.it_interval = itv.it_value; setitimer(ITIMER_REAL, &itv, NULL); } static void progressmeter(int flag) { static struct timeval lastupdate; static off_t lastsize, totalsize; struct timeval now, td, tvwait; off_t abbrevsize; int elapsed, ratio, barlength, i; char buf[256]; if (flag == -1) { /* first call to progressmeter */ gettimeofday(&start, (struct timezone *) 0); lastupdate = start; lastsize = 0; totalsize = content_len + beg_range; /* as content_len changes.. */ } gettimeofday(&now, (struct timezone *) 0); ratio = 100; if (totalsize != 0 && !chunked) { /* long long helps to have working ETA even if !LFS */ ratio = (int) (100 * (unsigned long long)(transferred+beg_range) / totalsize); ratio = MIN(ratio, 100); } fprintf(stderr, "\r%-20.20s%4d%% ", curfile, ratio); barlength = getttywidth() - 51; if (barlength > 0 && barlength < sizeof(buf)) { i = barlength * ratio / 100; memset(buf, '*', i); memset(buf + i, ' ', barlength - i); buf[barlength] = '\0'; fprintf(stderr, "|%s|", buf); } i = 0; abbrevsize = transferred + beg_range; while (abbrevsize >= 100000) { i++; abbrevsize >>= 10; } /* see http://en.wikipedia.org/wiki/Tera */ fprintf(stderr, "%6d %c%c ", (int)abbrevsize, " KMGTPEZY"[i], i?'B':' '); timersub(&now, &lastupdate, &tvwait); if (transferred > lastsize) { lastupdate = now; lastsize = transferred; if (tvwait.tv_sec >= STALLTIME) timeradd(&start, &tvwait, &start); tvwait.tv_sec = 0; } timersub(&now, &start, &td); elapsed = td.tv_sec; if (tvwait.tv_sec >= STALLTIME) { fprintf(stderr, " - stalled -"); } else { off_t to_download = totalsize - beg_range; if (transferred <= 0 || elapsed <= 0 || transferred > to_download || chunked) { fprintf(stderr, "--:--:-- ETA"); } else { /* to_download / (transferred/elapsed) - elapsed: */ int eta = (int) ((unsigned long long)to_download*elapsed/transferred - elapsed); /* (long long helps to have working ETA even if !LFS) */ i = eta % 3600; fprintf(stderr, "%02d:%02d:%02d ETA", eta / 3600, i / 60, i % 60); } } if (flag == -1) { /* first call to progressmeter */ struct sigaction sa; sa.sa_handler = updateprogressmeter; sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART; sigaction(SIGALRM, &sa, NULL); alarmtimer(1); } else if (flag == 1) { /* last call to progressmeter */ alarmtimer(0); transferred = 0; putc('\n', stderr); } } #endif /* Original copyright notice which applies to the CONFIG_FEATURE_WGET_STATUSBAR stuff, * much of which was blatantly stolen from openssh. */ /*- * Copyright (c) 1992, 1993 * 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. * * 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. * * $Id: wget.c,v 1.75 2004/10/08 08:27:40 andersen Exp $ */