/* vi: set sw=4 ts=4: */ /* * wget - retrieve a file using HTTP or FTP * * Chip Rosenthal Covad Communications <chip@laserlink.net> * */ #include "busybox.h" #include <errno.h> #include <signal.h> #include <sys/ioctl.h> #include <getopt.h> struct host_info { 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(struct sockaddr_in *s_in); 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 filesize; /* content-length of the file */ static int chunked; /* chunked transfer encoding */ #ifdef CONFIG_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. */ static off_t transferred; /* Number of bytes transferred so far. */ /* For progressmeter() -- number of seconds before xfer considered "stalled" */ enum { STALLTIME = 5 }; #else static inline void progressmeter(int flag) {} #endif static void close_and_delete_outfile(FILE* output, char *fname_out, int do_continue) { if (output != stdout && do_continue==0) { fclose(output); unlink(fname_out); } } /* 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; } /* Write NMEMB elements of SIZE bytes from PTR to STREAM. Returns the * number of elements written, and a short count if an eof or non-interrupt * error is encountered. */ static size_t safe_fwrite(void *ptr, size_t size, size_t nmemb, FILE *stream) { size_t ret = 0; do { clearerr(stream); ret += fwrite((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; } #define close_delete_and_die(s...) { \ close_and_delete_outfile(output, fname_out, do_continue); \ bb_error_msg_and_die(s); } #ifdef CONFIG_FEATURE_WGET_AUTHENTICATION /* * Base64-encode character string * oops... isn't something similar in uuencode.c? * XXX: It would be better to use already existing code */ static char *base64enc(unsigned char *p, char *buf, int len) { char al[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" "0123456789+/"; char *s = buf; while(*p) { if (s >= buf+len-4) bb_error_msg_and_die("buffer overflow"); *(s++) = al[(*p >> 2) & 0x3F]; *(s++) = al[((*p << 4) & 0x30) | ((*(p+1) >> 4) & 0x0F)]; *s = *(s+1) = '='; *(s+2) = 0; if (! *(++p)) break; *(s++) = al[((*p << 2) & 0x3C) | ((*(p+1) >> 6) & 0x03)]; if (! *(++p)) break; *(s++) = al[*(p++) & 0x3F]; } return buf; } #endif #define WGET_OPT_CONTINUE 1 #define WGET_OPT_QUIET 2 #define WGET_OPT_PASSIVE 4 #define WGET_OPT_OUTNAME 8 #define WGET_OPT_HEADER 16 #define WGET_OPT_PREFIX 32 #define WGET_OPT_PROXY 64 #if ENABLE_WGET_LONG_OPTIONS static const struct option wget_long_options[] = { { "continue", 0, NULL, 'c' }, { "quiet", 0, NULL, 'q' }, { "passive-ftp", 0, NULL, 139 }, { "output-document", 1, NULL, 'O' }, { "header", 1, NULL, 131 }, { "directory-prefix",1, NULL, 'P' }, { "proxy", 1, NULL, 'Y' }, { 0, 0, 0, 0 } }; #endif int wget_main(int argc, char **argv) { int n, try=5, status; unsigned long opt; int port; char *proxy = 0; char *dir_prefix=NULL; char *s, buf[512]; struct stat sbuf; char extra_headers[1024]; char *extra_headers_ptr = extra_headers; int extra_headers_left = sizeof(extra_headers); struct host_info server, target; struct sockaddr_in s_in; llist_t *headers_llist = 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 do_continue = 0; /* continue a prev transfer (-c) */ long beg_range = 0L; /* range at which continue begins */ int got_clen = 0; /* got content-length: from server */ FILE *output; /* socket to web server */ int quiet_flag = FALSE; /* Be verry, verry quiet... */ int use_proxy = 1; /* Use proxies if env vars are set */ char *proxy_flag = "on"; /* Use proxies if env vars are set */ /* * Crack command line. */ bb_opt_complementally = "-1:\203::"; #if ENABLE_WGET_LONG_OPTIONS bb_applet_long_options = wget_long_options; #endif opt = bb_getopt_ulflags(argc, argv, "cq\213O:\203:P:Y:", &fname_out, &headers_llist, &dir_prefix, &proxy_flag); if (opt & WGET_OPT_CONTINUE) { ++do_continue; } if (opt & WGET_OPT_QUIET) { quiet_flag = TRUE; } if (strcmp(proxy_flag, "off") == 0) { /* Use the proxy if necessary. */ use_proxy = 0; } if (opt & WGET_OPT_HEADER) { while (headers_llist) { int arglen = strlen(headers_llist->data); if (extra_headers_left - arglen - 2 <= 0) bb_error_msg_and_die("extra_headers buffer too small(need %i)", extra_headers_left - arglen); strcpy(extra_headers_ptr, headers_llist->data); extra_headers_ptr += arglen; extra_headers_left -= ( arglen + 2 ); *extra_headers_ptr++ = '\r'; *extra_headers_ptr++ = '\n'; *(extra_headers_ptr + 1) = 0; headers_llist = headers_llist->link; } } 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(bb_xstrdup(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(*target.path && target.path[strlen(target.path)-1]!='/') { fname_out = #ifdef CONFIG_FEATURE_WGET_STATUSBAR curfile = #endif bb_get_last_path_component(target.path); } if (fname_out==NULL || strlen(fname_out)<1) { fname_out = #ifdef CONFIG_FEATURE_WGET_STATUSBAR curfile = #endif "index.html"; } if (dir_prefix != NULL) fname_out = concat_path_file(dir_prefix, fname_out); #ifdef CONFIG_FEATURE_WGET_STATUSBAR } else { curfile = bb_get_last_path_component(fname_out); #endif } if (do_continue && !fname_out) bb_error_msg_and_die("cannot specify continue (-c) without a filename (-O)"); /* * Open the output file stream. */ if (strcmp(fname_out, "-") == 0) { output = stdout; quiet_flag = TRUE; } else { output = bb_xfopen(fname_out, (do_continue ? "a" : "w")); } /* * Determine where to start transfer. */ if (do_continue) { if (fstat(fileno(output), &sbuf) < 0) bb_perror_msg_and_die("fstat()"); if (sbuf.st_size > 0) beg_range = sbuf.st_size; else do_continue = 0; } /* 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... */ bb_lookup_host(&s_in, server.host); s_in.sin_port = server.port; if (quiet_flag==FALSE) { fprintf(stdout, "Connecting to %s[%s]:%d\n", server.host, inet_ntoa(s_in.sin_addr), ntohs(server.port)); } if (use_proxy || !target.is_ftp) { /* * HTTP session */ do { got_clen = chunked = 0; if (! --try) close_delete_and_die("too many redirections"); /* * Open socket to http server */ if (sfp) fclose(sfp); sfp = open_socket(&s_in); /* * Send HTTP request. */ if (use_proxy) { const char *format = "GET %stp://%s:%d/%s HTTP/1.1\r\n"; #ifdef CONFIG_FEATURE_WGET_IP6_LITERAL if (strchr(target.host, ':')) format = "GET %stp://[%s]:%d/%s HTTP/1.1\r\n"; #endif fprintf(sfp, format, target.is_ftp ? "f" : "ht", target.host, ntohs(target.port), target.path); } else { fprintf(sfp, "GET /%s HTTP/1.1\r\n", target.path); } fprintf(sfp, "Host: %s\r\nUser-Agent: Wget\r\n", target.host); #ifdef CONFIG_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 (do_continue) fprintf(sfp, "Range: bytes=%ld-\r\n", beg_range); if(extra_headers_left < sizeof(extra_headers)) fputs(extra_headers,sfp); 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) close_delete_and_die("no response from server"); for (s = buf ; *s != '\0' && !isspace(*s) ; ++s) ; for ( ; isspace(*s) ; ++s) ; switch (status = atoi(s)) { case 0: case 100: while (gethdr(buf, sizeof(buf), sfp, &n) != NULL); goto read_response; case 200: if (do_continue && output != stdout) output = freopen(fname_out, "w", output); do_continue = 0; break; case 300: /* redirection */ case 301: case 302: case 303: break; case 206: if (do_continue) break; /*FALLTHRU*/ default: chomp(buf); close_delete_and_die("server returned error %d: %s", atoi(s), buf); } /* * Retrieve HTTP headers. */ while ((s = gethdr(buf, sizeof(buf), sfp, &n)) != NULL) { if (strcasecmp(buf, "content-length") == 0) { unsigned long value; if (safe_strtoul(s, &value)) { close_delete_and_die("content-length %s is garbage", s); } filesize = value; got_clen = 1; continue; } if (strcasecmp(buf, "transfer-encoding") == 0) { if (strcasecmp(s, "chunked") == 0) { chunked = got_clen = 1; } else { close_delete_and_die("server wants to do %s transfer encoding", s); } } if (strcasecmp(buf, "location") == 0) { if (s[0] == '/') target.path = bb_xstrdup(s+1); else { parse_url(bb_xstrdup(s), &target); if (use_proxy == 0) { server.host = target.host; server.port = target.port; } bb_lookup_host(&s_in, server.host); s_in.sin_port = server.port; break; } } } } while(status >= 300); dfp = sfp; } else { /* * FTP session */ if (! target.user) target.user = bb_xstrdup("anonymous:busybox@"); sfp = open_socket(&s_in); if (ftpcmd(NULL, NULL, sfp, buf) != 220) close_delete_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: close_delete_and_die("ftp login: %s", buf+4); } ftpcmd("TYPE I", NULL, sfp, buf); /* * Querying file size */ if (ftpcmd("SIZE ", target.path, sfp, buf) == 213) { unsigned long value; if (safe_strtoul(buf+4, &value)) { close_delete_and_die("SIZE value is garbage"); } filesize = value; got_clen = 1; } /* * Entering passive mode */ if (ftpcmd("PASV", NULL, sfp, buf) != 227) close_delete_and_die("PASV: %s", buf+4); s = strrchr(buf, ','); *s = 0; port = atoi(s+1); s = strrchr(buf, ','); port += atoi(s+1) * 256; s_in.sin_port = htons(port); dfp = open_socket(&s_in); if (do_continue) { sprintf(buf, "REST %ld", beg_range); if (ftpcmd(buf, NULL, sfp, buf) != 350) { if (output != stdout) output = freopen(fname_out, "w", output); do_continue = 0; } else filesize -= beg_range; } if (ftpcmd("RETR ", target.path, sfp, buf) > 150) close_delete_and_die("RETR: %s", buf+4); } /* * Retrieve file */ if (chunked) { fgets(buf, sizeof(buf), dfp); filesize = strtol(buf, (char **) NULL, 16); } if (quiet_flag==FALSE) progressmeter(-1); do { while ((filesize > 0 || !got_clen) && (n = safe_fread(buf, 1, ((chunked || got_clen) && (filesize < sizeof(buf)) ? filesize : sizeof(buf)), dfp)) > 0) { if (safe_fwrite(buf, 1, n, output) != n) { bb_perror_msg_and_die(bb_msg_write_error); } #ifdef CONFIG_FEATURE_WGET_STATUSBAR transferred += n; #endif if (got_clen) { filesize -= n; } } if (chunked) { safe_fgets(buf, sizeof(buf), dfp); /* This is a newline */ safe_fgets(buf, sizeof(buf), dfp); filesize = strtol(buf, (char **) NULL, 16); if (filesize==0) { chunked = 0; /* all done! */ } } if (n == 0 && ferror(dfp)) { bb_perror_msg_and_die(bb_msg_read_error); } } while (chunked); if (quiet_flag==FALSE) 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); } void parse_url(char *url, struct host_info *h) { char *cp, *sp, *up, *pp; 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", "tfp", 21); h->host = url + 6; h->is_ftp = 1; } else bb_error_msg_and_die("not an http or ftp url: %s", url); sp = strchr(h->host, '/'); if (sp) { *sp++ = '\0'; h->path = sp; } else h->path = bb_xstrdup(""); up = strrchr(h->host, '@'); if (up != NULL) { h->user = h->host; *up++ = '\0'; h->host = up; } else h->user = NULL; pp = h->host; #ifdef CONFIG_FEATURE_WGET_IP6_LITERAL if (h->host[0] == '[') { char *ep; ep = h->host + 1; while (*ep == ':' || isxdigit (*ep)) ep++; if (*ep == ']') { h->host++; *ep = '\0'; pp = ep + 1; } } #endif cp = strchr(pp, ':'); if (cp != NULL) { *cp++ = '\0'; h->port = htons(atoi(cp)); } } FILE *open_socket(struct sockaddr_in *s_in) { FILE *fp; fp = fdopen(xconnect(s_in), "r+"); if (fp == NULL) bb_perror_msg_and_die("fdopen()"); return fp; } 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) { 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("fgets()"); } buf_ptr = strstr(buf, "\r\n"); if (buf_ptr) { *buf_ptr = '\0'; } } while (! isdigit(buf[0]) || buf[3] != ' '); return atoi(buf); } #ifdef CONFIG_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=0; 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 wait) { struct itimerval itv; itv.it_value.tv_sec = wait; 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, wait; off_t abbrevsize; int elapsed, ratio, barlength, i; char buf[256]; if (flag == -1) { (void) gettimeofday(&start, (struct timezone *) 0); lastupdate = start; lastsize = 0; totalsize = filesize; /* as filesize changes.. */ } (void) gettimeofday(&now, (struct timezone *) 0); ratio = 100; if (totalsize != 0 && !chunked) { ratio = (int) (100 * transferred / 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; 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, &wait); if (transferred > lastsize) { lastupdate = now; lastsize = transferred; if (wait.tv_sec >= STALLTIME) timeradd(&start, &wait, &start); wait.tv_sec = 0; } timersub(&now, &start, &td); elapsed = td.tv_sec; if (wait.tv_sec >= STALLTIME) { fprintf(stderr, " - stalled -"); } else if (transferred <= 0 || elapsed <= 0 || transferred > totalsize || chunked) { fprintf(stderr, "--:--:-- ETA"); } else { /* totalsize / (transferred/elapsed) - elapsed: */ int eta = (int) (totalsize*elapsed/transferred - elapsed); i = eta % 3600; fprintf(stderr, "%02d:%02d:%02d ETA", eta / 3600, i / 60, i % 60); } if (flag == -1) { 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) { 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. <BSD Advertising Clause omitted per the July 22, 1999 licensing change * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change> * * 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 $ */