/* vi: set sw=4 ts=4: */ /* * wget - retrieve a file using HTTP * * Chip Rosenthal Covad Communications * * Note: According to RFC2616 section 3.6.1, "All HTTP/1.1 applications MUST be * able to receive and decode the "chunked" transfer-coding, and MUST ignore * chunk-extension extensions they do not understand." * * This prevents this particular wget app from completely RFC compliant, and as * such, prevents it from being used as a general purpose web browser... This * is a design decision, since it makes the code smaller. * */ #include "busybox.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include void parse_url(char *url, char **uri_host, int *uri_port, char **uri_path); FILE *open_socket(char *host, int port); char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc); void progressmeter(int flag); /* Globals (can be accessed from signal handlers */ static off_t filesize = 0; /* content-length of the file */ #ifdef BB_FEATURE_WGET_STATUSBAR static char *curfile; /* Name of current file being transferred. */ static struct timeval start; /* Time a transfer started. */ volatile unsigned long statbytes; /* Number of bytes transferred so far. */ /* For progressmeter() -- number of seconds before xfer considered "stalled" */ static const int STALLTIME = 5; #endif void close_and_delete_outfile(FILE* output, char *fname_out, int do_continue) { if (output != stdout && do_continue==0) { fclose(output); unlink(fname_out); } } int wget_main(int argc, char **argv) { int n; char *proxy, *proxy_host; int uri_port, proxy_port; char *s, buf[512]; struct stat sbuf; FILE *sfp; /* socket to web server */ char *uri_host, *uri_path; /* parsed from command line url */ 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... */ /* * Crack command line. */ while ((n = getopt(argc, argv, "cqO:")) != EOF) { switch (n) { case 'c': ++do_continue; break; case 'q': quiet_flag = TRUE; break; case 'O': /* can't set fname_out to NULL if outputting to stdout, because * this gets interpreted as the auto-gen output filename * case below - tausq@debian.org */ fname_out = (strcmp(optarg, "-") == 0 ? (char *)1 : optarg); break; default: usage(wget_usage); } } if (argc - optind != 1) usage(wget_usage); /* * Use the proxy if necessary. */ if ((proxy = getenv("http_proxy")) != NULL) { proxy = xstrdup(proxy); parse_url(proxy, &proxy_host, &proxy_port, &uri_path); parse_url(argv[optind], &uri_host, &uri_port, &uri_path); } else { /* * Parse url into components. */ parse_url(argv[optind], &uri_host, &uri_port, &uri_path); proxy_host=uri_host; proxy_port=uri_port; } /* Guess an output filename */ if (!fname_out) { fname_out = #ifdef BB_FEATURE_WGET_STATUSBAR curfile = #endif get_last_path_component(uri_path); if (fname_out==NULL || strlen(fname_out)<1) { fname_out = #ifdef BB_FEATURE_WGET_STATUSBAR curfile = #endif "index.html"; } #ifdef BB_FEATURE_WGET_STATUSBAR } else { curfile=argv[optind]; #endif } if (do_continue && !fname_out) error_msg_and_die("cannot specify continue (-c) without a filename (-O)\n"); /* * Open socket to server. */ sfp = open_socket(proxy_host, proxy_port); /* Make the assumption that if the file already exists * on disk that the intention is to continue downloading * a previously aborted download -Erik */ if (stat(fname_out, &sbuf) == 0) { ++do_continue; } /* * Open the output file stream. */ if (fname_out != (char *)1) { if ( (output=fopen(fname_out, (do_continue ? "a" : "w"))) == NULL) perror_msg_and_die("fopen(%s)", fname_out); } else { output = stdout; } /* * Determine where to start transfer. */ if (do_continue) { if (fstat(fileno(output), &sbuf) < 0) perror_msg_and_die("fstat()"); if (sbuf.st_size > 0) beg_range = sbuf.st_size; else do_continue = 0; } /* * Send HTTP request. */ fprintf(sfp, "GET http://%s:%d/%s HTTP/1.1\r\n", uri_host, uri_port, uri_path); fprintf(sfp, "Host: %s\r\nUser-Agent: Wget\r\n", uri_host); if (do_continue) fprintf(sfp, "Range: bytes=%ld-\r\n", beg_range); fprintf(sfp,"Connection: close\r\n\r\n"); /* * Retrieve HTTP response line and check for "200" status code. */ if (fgets(buf, sizeof(buf), sfp) == NULL) { close_and_delete_outfile(output, fname_out, do_continue); error_msg_and_die("no response from server\n"); } for (s = buf ; *s != '\0' && !isspace(*s) ; ++s) ; for ( ; isspace(*s) ; ++s) ; switch (atoi(s)) { case 0: case 200: break; case 206: if (do_continue) break; /*FALLTHRU*/ default: close_and_delete_outfile(output, fname_out, do_continue); error_msg_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) { filesize = atol(s); got_clen = 1; continue; } if (strcasecmp(buf, "transfer-encoding") == 0) { close_and_delete_outfile(output, fname_out, do_continue); error_msg_and_die("server wants to do %s transfer encoding\n", s); continue; } } /* * Retrieve HTTP body. */ #ifdef BB_FEATURE_WGET_STATUSBAR statbytes=0; if (quiet_flag==FALSE) progressmeter(-1); #endif while (filesize > 0 && (n = fread(buf, 1, sizeof(buf), sfp)) > 0) { fwrite(buf, 1, n, output); #ifdef BB_FEATURE_WGET_STATUSBAR statbytes+=n; if (quiet_flag==FALSE) progressmeter(1); #endif if (got_clen) filesize -= n; } if (n == 0 && ferror(sfp)) perror_msg_and_die("network read error"); exit(0); } void parse_url(char *url, char **uri_host, int *uri_port, char **uri_path) { char *cp, *sp; *uri_port = 80; if (strncmp(url, "http://", 7) != 0) error_msg_and_die("not an http url: %s\n", url); *uri_host = url + 7; cp = strchr(*uri_host, ':'); sp = strchr(*uri_host, '/'); if (cp != NULL && (sp == NULL || cp < sp)) { *cp++ = '\0'; *uri_port = atoi(cp); } if (sp != NULL) { *sp++ = '\0'; *uri_path = sp; } else *uri_path = ""; } FILE *open_socket(char *host, int port) { struct sockaddr_in sin; struct hostent *hp; int fd; FILE *fp; memzero(&sin, sizeof(sin)); sin.sin_family = AF_INET; if ((hp = (struct hostent *) gethostbyname(host)) == NULL) error_msg_and_die("cannot resolve %s\n", host); memcpy(&sin.sin_addr, hp->h_addr_list[0], hp->h_length); sin.sin_port = htons(port); /* * Get the server onto a stdio stream. */ if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) perror_msg_and_die("socket()"); if (connect(fd, (struct sockaddr *) &sin, sizeof(sin)) < 0) perror_msg_and_die("connect(%s)", host); if ((fp = fdopen(fd, "r+")) == NULL) 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 != ':') error_msg_and_die("bad header line: %s\n", 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; } #ifdef BB_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. * */ int getttywidth(void) { struct winsize winsize; if (ioctl(fileno(stdout), TIOCGWINSZ, &winsize) != -1) return (winsize.ws_col ? winsize.ws_col : 80); else return (80); } void updateprogressmeter(int ignore) { int save_errno = errno; progressmeter(0); errno = save_errno; } 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); } void progressmeter(int flag) { static const char prefixes[] = " KMGTP"; static struct timeval lastupdate; static off_t lastsize; struct timeval now, td, wait; off_t cursize, abbrevsize; double elapsed; int ratio, barlength, i, remaining; char buf[256]; if (flag == -1) { (void) gettimeofday(&start, (struct timezone *) 0); lastupdate = start; lastsize = 0; } (void) gettimeofday(&now, (struct timezone *) 0); cursize = statbytes; if (filesize != 0) { ratio = 100.0 * cursize / filesize; ratio = MAX(ratio, 0); ratio = MIN(ratio, 100); } else ratio = 100; snprintf(buf, sizeof(buf), "\r%-20.20s %3d%% ", curfile, ratio); barlength = getttywidth() - 51; if (barlength > 0) { i = barlength * ratio / 100; snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "|%.*s%*s|", i, "*****************************************************************************" "*****************************************************************************", barlength - i, ""); } i = 0; abbrevsize = cursize; while (abbrevsize >= 100000 && i < sizeof(prefixes)) { i++; abbrevsize >>= 10; } snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " %5d %c%c ", (int) abbrevsize, prefixes[i], prefixes[i] == ' ' ? ' ' : 'B'); timersub(&now, &lastupdate, &wait); if (cursize > lastsize) { lastupdate = now; lastsize = cursize; if (wait.tv_sec >= STALLTIME) { start.tv_sec += wait.tv_sec; start.tv_usec += wait.tv_usec; } wait.tv_sec = 0; } timersub(&now, &start, &td); elapsed = td.tv_sec + (td.tv_usec / 1000000.0); if (statbytes <= 0 || elapsed <= 0.0 || cursize > filesize) { snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " --:-- ETA"); } else if (wait.tv_sec >= STALLTIME) { snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " - stalled -"); } else { remaining = (int) (filesize / (statbytes / elapsed) - elapsed); i = remaining / 3600; if (i) snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%2d:", i); else snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " "); i = remaining % 3600; snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%02d:%02d ETA", i / 60, i % 60); } write(fileno(stderr), buf, strlen(buf)); 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); statbytes = 0; } } #endif /* Original copyright notice which applies to the BB_FEATURE_WGET_STATUSBAR stuff, * much of which was blatently 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 1.21 2001/01/24 20:28:35 andersen Exp $ */ /* Local Variables: c-file-style: "linux" c-basic-offset: 4 tab-width: 4 End: */