| /* vi: set sw=4 ts=4: */ |
| /* |
| * wget - retrieve a file using HTTP |
| * |
| * Chip Rosenthal Covad Communications <chip@laserlink.net> |
| * |
| * 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 <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <ctype.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <signal.h> |
| #include <sys/ioctl.h> |
| |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <netdb.h> |
| |
| |
| 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" */ |
| #define STALLTIME 5 |
| #endif |
| |
| 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); |
| |
| if (do_continue && !fname_out) |
| error_msg_and_die("cannot specify continue (-c) without a filename (-O)\n"); |
| |
| /* |
| * 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 |
| } |
| |
| |
| /* |
| * 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) { |
| 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 200: |
| if (!do_continue) |
| break; |
| error_msg_and_die("server does not support ranges\n"); |
| case 206: |
| if (do_continue) |
| break; |
| /*FALLTHRU*/ |
| default: |
| error_msg_and_die("server returned error: %s", buf); |
| } |
| |
| /* |
| * Retrieve HTTP headers. |
| */ |
| while ((s = gethdr(buf, sizeof(buf), sfp, &n)) != NULL) { |
| if (strcmp(buf, "content-length") == 0) { |
| filesize = atol(s); |
| got_clen = 1; |
| continue; |
| } |
| if (strcmp(buf, "transfer-encoding") == 0) { |
| 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. <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 1.16 2001/01/20 20:07:00 andersen Exp $ |
| */ |
| |
| |
| |
| /* |
| Local Variables: |
| c-file-style: "linux" |
| c-basic-offset: 4 |
| tab-width: 4 |
| End: |
| */ |
| |
| |
| |