Initial implementation of wget, from Chip Rosenthal <chip@laserlink.net>.
Very cool. Still lacks "chunked" transfer-coding, so not totally RFC compliant for HTTP1.1, but very nice nonethe less, and very small. -Erik
This commit is contained in:
Eric Andersen
parent
b92223b6f5
commit
9670083818
@ -328,6 +328,9 @@ const struct BB_applet applets[] = {
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#ifdef BB_WC
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{"wc", wc_main, _BB_DIR_USR_BIN, wc_usage},
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#endif
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#ifdef BB_WGET
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{"wget", wget_main, _BB_DIR_USR_BIN, wget_usage},
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#endif
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#ifdef BB_WHICH
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{"which", which_main, _BB_DIR_USR_BIN, which_usage},
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#endif
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@ -328,6 +328,9 @@ const struct BB_applet applets[] = {
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#ifdef BB_WC
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{"wc", wc_main, _BB_DIR_USR_BIN, wc_usage},
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#endif
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#ifdef BB_WGET
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{"wget", wget_main, _BB_DIR_USR_BIN, wget_usage},
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#endif
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#ifdef BB_WHICH
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{"which", which_main, _BB_DIR_USR_BIN, which_usage},
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#endif
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@ -100,6 +100,7 @@
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#define BB_UPTIME
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#define BB_USLEEP
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#define BB_WC
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#define BB_WGET
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#define BB_WHICH
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#define BB_WHOAMI
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#define BB_UUENCODE
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@ -213,6 +213,7 @@ extern int uniq_main(int argc, char** argv);
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extern int update_main(int argc, char** argv);
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extern int usleep_main(int argc, char** argv);
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extern int wc_main(int argc, char** argv);
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extern int wget_main(int argc, char** argv);
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extern int which_main(int argc, char** argv);
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extern int whoami_main(int argc, char** argv);
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extern int yes_main(int argc, char** argv);
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@ -318,6 +319,7 @@ extern const char usleep_usage[];
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extern const char uudecode_usage[];
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extern const char uuencode_usage[];
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extern const char wc_usage[];
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extern const char wget_usage[];
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extern const char which_usage[];
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extern const char whoami_usage[];
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extern const char yes_usage[];
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264
networking/wget.c
Normal file
264
networking/wget.c
Normal file
@ -0,0 +1,264 @@
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/* vi: set sw=4 ts=4: */
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/*
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* wget - retrieve a file using HTTP
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*
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* Chip Rosenthal
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* Covad Communications
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* <chip@laserlink.net>
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*/
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#include "internal.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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void parse_url(char *url, char **uri_host, int *uri_port, char **uri_path);
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FILE *open_socket(char *host, int port);
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char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc);
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int wget_main(int argc, char **argv)
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{
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FILE *sfp; /* socket to web server */
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char *uri_host, *uri_path; /* parsed from command line url */
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int uri_port;
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char *s, buf[512];
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int n;
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char *fname_out = NULL; /* where to direct output (-O) */
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int do_continue = 0; /* continue a prev transfer (-c) */
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long beg_range = 0L; /* range at which continue begins */
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int got_clen = 0; /* got content-length: from server */
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long clen = 1L; /* the content length */
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/*
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* Crack command line.
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*/
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while ((n = getopt(argc, argv, "cO:")) != EOF) {
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switch (n) {
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case 'c':
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++do_continue;
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break;
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case 'O':
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fname_out = optarg;
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break;
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default:
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usage(wget_usage);
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}
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}
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if (do_continue && !fname_out)
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fatalError("wget: cannot specify continue (-c) without a filename (-O)\n");
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if (argc - optind != 1)
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usage(wget_usage);
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/*
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* Parse url into components.
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*/
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parse_url(argv[optind], &uri_host, &uri_port, &uri_path);
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/*
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* Open socket to server.
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*/
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sfp = open_socket(uri_host, uri_port);
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/*
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* Open the output stream.
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*/
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if (fname_out != NULL) {
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/* Check if the file is supposed to go to stdout */
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if (!strcmp(fname_out, "-") == 0) {
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/* Nope -- so open the output file */
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if (freopen(fname_out, (do_continue ? "a" : "w"), stdout) == NULL)
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fatalError("wget: freopen(%s): %s\n", fname_out, strerror(errno));
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}
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}
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/*
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* Determine where to start transfer.
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*/
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if (do_continue) {
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struct stat sbuf;
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if (fstat(fileno(stdout), &sbuf) < 0)
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fatalError("wget: fstat(): %s\n", strerror(errno));
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if (sbuf.st_size > 0)
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beg_range = sbuf.st_size;
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else
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do_continue = 0;
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}
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/*
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* Send HTTP request.
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*/
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fprintf(sfp, "GET %s HTTP/1.1\r\nHost: %s\r\n", uri_path, uri_host);
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if (do_continue)
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fprintf(sfp, "Range: bytes=%ld-\r\n", beg_range);
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fputs("Connection: close\r\n\r\n", sfp);
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/*
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* Retrieve HTTP response line and check for "200" status code.
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*/
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if (fgets(buf, sizeof(buf), sfp) == NULL)
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fatalError("wget: no response from server\n");
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for (s = buf ; *s != '\0' && !isspace(*s) ; ++s)
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;
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for ( ; isspace(*s) ; ++s)
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;
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switch (atoi(s)) {
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case 200:
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if (!do_continue)
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break;
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fatalError("wget: cannot continue - server does not properly support ranges\n");
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case 206:
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if (do_continue)
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break;
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/*FALLTHRU*/
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default:
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fatalError("wget: server returned error: %s", buf);
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}
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/*
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* Retrieve HTTP headers.
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*/
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while ((s = gethdr(buf, sizeof(buf), sfp, &n)) != NULL) {
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if (strcmp(buf, "content-length") == 0) {
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clen = atol(s);
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got_clen = 1;
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continue;
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}
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if (strcmp(buf, "transfer-encoding") == 0) {
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fatalError("wget: i do not do transfer encodings, server wants to do: %s\n", s);
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continue;
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}
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}
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/*
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* Retrieve HTTP body.
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*/
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while (clen > 0 && (n = fread(buf, 1, sizeof(buf), sfp)) > 0) {
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fwrite(buf, 1, n, stdout);
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if (got_clen)
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clen -= n;
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}
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if (n == 0 && ferror(sfp))
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fatalError("wget: network read error: %s", strerror(errno));
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exit(0);
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}
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void parse_url(char *url, char **uri_host, int *uri_port, char **uri_path)
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{
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char *s, *h;
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*uri_port = 80;
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if (strncmp(url, "http://", 7) != 0)
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fatalError("wget: not an http url: %s\n", url);
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/* pull the host portion to the front of the buffer */
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for (s = url, h = url+7 ; *h != '/' ; ++h) {
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if (*h == '\0')
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fatalError("wget: cannot parse url: %s\n", url);
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if (*h == ':') {
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*uri_port = atoi(h+1);
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*h = '\0';
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}
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*s++ = *h;
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}
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*s = '\0';
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*uri_host = url;
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*uri_path = h;
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}
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FILE *open_socket(char *host, int port)
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{
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struct sockaddr_in sin;
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struct hostent *hp;
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int fd;
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FILE *fp;
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memzero(&sin, sizeof(sin));
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sin.sin_family = AF_INET;
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if ((hp = (struct hostent *) gethostbyname(host)) == NULL)
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fatalError("wget: cannot resolve %s\n", host);
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memcpy(&sin.sin_addr, hp->h_addr_list[0], hp->h_length);
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sin.sin_port = htons(port);
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/*
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* Get the server onto a stdio stream.
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*/
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if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
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fatalError("wget: socket(): %s\n", strerror(errno));
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if (connect(fd, (struct sockaddr *) &sin, sizeof(sin)) < 0)
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fatalError("wget: connect(%s): %s\n", host, strerror(errno));
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if ((fp = fdopen(fd, "r+")) == NULL)
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fatalError("wget: fdopen(): %s\n", strerror(errno));
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return fp;
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}
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char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc)
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{
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char *s, *hdrval;
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int c;
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*istrunc = 0;
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/* retrieve header line */
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if (fgets(buf, bufsiz, fp) == NULL)
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return NULL;
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/* see if we are at the end of the headers */
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for (s = buf ; *s == '\r' ; ++s)
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;
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if (s[0] == '\n')
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return NULL;
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/* convert the header name to lower case */
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for (s = buf ; isalnum(*s) || *s == '-' ; ++s)
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*s = tolower(*s);
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/* verify we are at the end of the header name */
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if (*s != ':')
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fatalError("wget: bad header line: %s\n", buf);
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/* locate the start of the header value */
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for (*s++ = '\0' ; *s == ' ' || *s == '\t' ; ++s)
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;
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hdrval = s;
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/* locate the end of header */
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while (*s != '\0' && *s != '\r' && *s != '\n')
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++s;
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/* end of header found */
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if (*s != '\0') {
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*s = '\0';
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return hdrval;
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}
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/* Rat! The buffer isn't big enough to hold the entire header value. */
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while (c = getc(fp), c != EOF && c != '\n')
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;
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*istrunc = 1;
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return hdrval;
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}
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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264
wget.c
Normal file
264
wget.c
Normal file
@ -0,0 +1,264 @@
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/* vi: set sw=4 ts=4: */
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/*
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* wget - retrieve a file using HTTP
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*
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* Chip Rosenthal
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* Covad Communications
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* <chip@laserlink.net>
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*/
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#include "internal.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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void parse_url(char *url, char **uri_host, int *uri_port, char **uri_path);
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FILE *open_socket(char *host, int port);
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char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc);
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int wget_main(int argc, char **argv)
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{
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FILE *sfp; /* socket to web server */
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char *uri_host, *uri_path; /* parsed from command line url */
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int uri_port;
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char *s, buf[512];
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int n;
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char *fname_out = NULL; /* where to direct output (-O) */
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int do_continue = 0; /* continue a prev transfer (-c) */
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long beg_range = 0L; /* range at which continue begins */
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int got_clen = 0; /* got content-length: from server */
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long clen = 1L; /* the content length */
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/*
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* Crack command line.
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*/
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while ((n = getopt(argc, argv, "cO:")) != EOF) {
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switch (n) {
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case 'c':
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++do_continue;
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break;
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case 'O':
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fname_out = optarg;
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break;
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default:
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usage(wget_usage);
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}
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}
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if (do_continue && !fname_out)
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fatalError("wget: cannot specify continue (-c) without a filename (-O)\n");
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if (argc - optind != 1)
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usage(wget_usage);
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/*
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* Parse url into components.
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*/
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parse_url(argv[optind], &uri_host, &uri_port, &uri_path);
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/*
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* Open socket to server.
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*/
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sfp = open_socket(uri_host, uri_port);
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/*
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* Open the output stream.
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*/
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if (fname_out != NULL) {
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/* Check if the file is supposed to go to stdout */
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if (!strcmp(fname_out, "-") == 0) {
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/* Nope -- so open the output file */
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if (freopen(fname_out, (do_continue ? "a" : "w"), stdout) == NULL)
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fatalError("wget: freopen(%s): %s\n", fname_out, strerror(errno));
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}
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}
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/*
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* Determine where to start transfer.
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*/
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if (do_continue) {
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struct stat sbuf;
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if (fstat(fileno(stdout), &sbuf) < 0)
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fatalError("wget: fstat(): %s\n", strerror(errno));
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if (sbuf.st_size > 0)
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beg_range = sbuf.st_size;
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else
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do_continue = 0;
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}
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/*
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* Send HTTP request.
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*/
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fprintf(sfp, "GET %s HTTP/1.1\r\nHost: %s\r\n", uri_path, uri_host);
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if (do_continue)
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fprintf(sfp, "Range: bytes=%ld-\r\n", beg_range);
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fputs("Connection: close\r\n\r\n", sfp);
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/*
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* Retrieve HTTP response line and check for "200" status code.
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*/
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if (fgets(buf, sizeof(buf), sfp) == NULL)
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fatalError("wget: no response from server\n");
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for (s = buf ; *s != '\0' && !isspace(*s) ; ++s)
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;
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for ( ; isspace(*s) ; ++s)
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;
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switch (atoi(s)) {
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case 200:
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if (!do_continue)
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break;
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fatalError("wget: cannot continue - server does not properly support ranges\n");
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case 206:
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if (do_continue)
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break;
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/*FALLTHRU*/
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default:
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fatalError("wget: server returned error: %s", buf);
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}
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/*
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* Retrieve HTTP headers.
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*/
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while ((s = gethdr(buf, sizeof(buf), sfp, &n)) != NULL) {
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if (strcmp(buf, "content-length") == 0) {
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clen = atol(s);
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got_clen = 1;
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continue;
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}
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if (strcmp(buf, "transfer-encoding") == 0) {
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fatalError("wget: i do not do transfer encodings, server wants to do: %s\n", s);
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continue;
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}
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}
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/*
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* Retrieve HTTP body.
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*/
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while (clen > 0 && (n = fread(buf, 1, sizeof(buf), sfp)) > 0) {
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fwrite(buf, 1, n, stdout);
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if (got_clen)
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clen -= n;
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}
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if (n == 0 && ferror(sfp))
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fatalError("wget: network read error: %s", strerror(errno));
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exit(0);
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}
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void parse_url(char *url, char **uri_host, int *uri_port, char **uri_path)
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{
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char *s, *h;
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*uri_port = 80;
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if (strncmp(url, "http://", 7) != 0)
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fatalError("wget: not an http url: %s\n", url);
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/* pull the host portion to the front of the buffer */
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for (s = url, h = url+7 ; *h != '/' ; ++h) {
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if (*h == '\0')
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fatalError("wget: cannot parse url: %s\n", url);
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||||
if (*h == ':') {
|
||||
*uri_port = atoi(h+1);
|
||||
*h = '\0';
|
||||
}
|
||||
*s++ = *h;
|
||||
}
|
||||
*s = '\0';
|
||||
*uri_host = url;
|
||||
*uri_path = h;
|
||||
}
|
||||
|
||||
|
||||
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)
|
||||
fatalError("wget: 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)
|
||||
fatalError("wget: socket(): %s\n", strerror(errno));
|
||||
if (connect(fd, (struct sockaddr *) &sin, sizeof(sin)) < 0)
|
||||
fatalError("wget: connect(%s): %s\n", host, strerror(errno));
|
||||
if ((fp = fdopen(fd, "r+")) == NULL)
|
||||
fatalError("wget: fdopen(): %s\n", strerror(errno));
|
||||
|
||||
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 != ':')
|
||||
fatalError("wget: 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;
|
||||
}
|
||||
|
||||
/* Rat! The buffer isn't big enough to hold the entire header value. */
|
||||
while (c = getc(fp), c != EOF && c != '\n')
|
||||
;
|
||||
*istrunc = 1;
|
||||
return hdrval;
|
||||
}
|
||||
|
||||
/*
|
||||
Local Variables:
|
||||
c-file-style: "linux"
|
||||
c-basic-offset: 4
|
||||
tab-width: 4
|
||||
End:
|
||||
*/
|
||||
Loading…
Reference in New Issue
Block a user