diff options
Diffstat (limited to 'wget.c')
| -rw-r--r-- | wget.c | 379 |
1 files changed, 282 insertions, 97 deletions
@@ -1,6 +1,6 @@ /* vi: set sw=4 ts=4: */ /* - * wget - retrieve a file using HTTP + * wget - retrieve a file using HTTP or FTP * * Chip Rosenthal Covad Communications <chip@laserlink.net> * @@ -47,9 +47,18 @@ } while (0) #endif -static void parse_url(char *url, char **uri_host, int *uri_port, char **uri_path); +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(char *host, int port); static char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc); +static int ftpcmd(char *s1, char *s2, FILE *fp, char *buf); static void progressmeter(int flag); /* Globals (can be accessed from signal handlers */ @@ -70,16 +79,52 @@ static void close_and_delete_outfile(FILE* output, char *fname_out, int do_conti } } +#define close_delete_and_die(s...) { \ + close_and_delete_outfile(output, fname_out, do_continue); \ + error_msg_and_die(s); } + + +#ifdef BB_FEATURE_WGET_AUTHENTICATION +/* + * Base64-encode character string + * oops... isn't something similar in uuencode.c? + * It would be better to use already existing code + */ +char *base64enc(char *p, char *buf, int len) { + + char al[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" + "0123456789+/"; + char *s = buf; + + while(*p) { + if (s >= buf+len-4) + 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 + int wget_main(int argc, char **argv) { - int n; - char *proxy, *proxy_host; - int uri_port, proxy_port; + int n, try=5, status; + int port; + char *proxy; char *s, buf[512]; struct stat sbuf; - FILE *sfp; /* socket to web server */ - char *uri_host, *uri_path; /* parsed from command line url */ + struct host_info server, target; + + 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 */ @@ -113,21 +158,16 @@ int wget_main(int argc, char **argv) if (argc - optind != 1) show_usage(); + parse_url(argv[optind], &target); + server.host = target.host; + server.port = target.port; + /* * 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; - } + proxy = getenv(target.is_ftp ? "ftp_proxy" : "http_proxy"); + if (proxy) + parse_url(xstrdup(proxy), &server); /* Guess an output filename */ if (!fname_out) { @@ -135,7 +175,7 @@ int wget_main(int argc, char **argv) #ifdef BB_FEATURE_WGET_STATUSBAR curfile = #endif - get_last_path_component(uri_path); + get_last_path_component(target.path); if (fname_out==NULL || strlen(fname_out)<1) { fname_out = #ifdef BB_FEATURE_WGET_STATUSBAR @@ -145,7 +185,7 @@ int wget_main(int argc, char **argv) } #ifdef BB_FEATURE_WGET_STATUSBAR } else { - curfile=argv[optind]; + curfile = get_last_path_component(fname_out); #endif } if (do_continue && !fname_out) @@ -153,18 +193,6 @@ int wget_main(int argc, char **argv) /* - * 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) { @@ -185,67 +213,185 @@ int wget_main(int argc, char **argv) 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 (proxy || !target.is_ftp) { + /* + * HTTP session + */ + do { + if (! --try) + close_delete_and_die("too many redirections"); - if (do_continue) - fprintf(sfp, "Range: bytes=%ld-\r\n", beg_range); - fprintf(sfp,"Connection: close\r\n\r\n"); + /* + * Open socket to http server + */ + if (sfp) fclose(sfp); + sfp = open_socket(server.host, server.port); + + /* + * Send HTTP request. + */ + if (proxy) { + fprintf(sfp, "GET %stp://%s:%d/%s HTTP/1.0\r\n", + target.is_ftp ? "f" : "ht", target.host, + target.port, target.path); + } else { + fprintf(sfp, "GET /%s HTTP/1.0\r\n", target.path); + } + + fprintf(sfp, "Host: %s\r\nUser-Agent: Wget\r\n", target.host); + +#ifdef BB_FEATURE_WGET_AUTHENTICATION + if (target.user) { + fprintf(sfp, "Authorization: Basic %s\r\n", + base64enc(target.user, buf, sizeof(buf))); + } + if (proxy && server.user) { + fprintf(sfp, "Proxy-Authorization: Basic %s\r\n", + base64enc(server.user, buf, sizeof(buf))); + } +#endif - /* - * 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"); - } - 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); - chomp(buf); - error_msg_and_die("server returned error %d: %s", atoi(s), buf); + 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_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 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) { + filesize = atol(s); + got_clen = 1; + continue; + } + if (strcasecmp(buf, "transfer-encoding") == 0) + close_delete_and_die("server wants to do %s transfer encoding", s); + + if (strcasecmp(buf, "location") == 0) { + if (s[0] == '/') + target.path = xstrdup(s+1); + else { + parse_url(xstrdup(s), &target); + if (!proxy) { + server.host = target.host; + server.port = target.port; + } + } + } + } + } while(status >= 300); + + dfp = sfp; } + else + { + /* + * FTP session + */ + if (! target.user) + target.user = xstrdup("anonymous:busybox@"); - /* - * Retrieve HTTP headers. - */ - while ((s = gethdr(buf, sizeof(buf), sfp, &n)) != NULL) { - if (strcasecmp(buf, "content-length") == 0) { - filesize = atol(s); + sfp = open_socket(server.host, server.port); + 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("CDUP", NULL, sfp, buf); + ftpcmd("TYPE I", NULL, sfp, buf); + + /* + * Querying file size + */ + if (ftpcmd("SIZE /", target.path, sfp, buf) == 213) { + filesize = atol(buf+4); 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", s); - continue; + + /* + * 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; + dfp = open_socket(server.host, port); + + 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 HTTP body. + * Retrieve file */ #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) { + while ((filesize > 0 || !got_clen) && (n = fread(buf, 1, sizeof(buf), dfp)) > 0) { fwrite(buf, 1, n, output); #ifdef BB_FEATURE_WGET_STATUSBAR statbytes+=n; @@ -255,37 +401,57 @@ int wget_main(int argc, char **argv) if (got_clen) filesize -= n; } - if (n == 0 && ferror(sfp)) + + if (n == 0 && ferror(dfp)) perror_msg_and_die("network read error"); - exit(0); + if (!proxy && target.is_ftp) { + fclose(dfp); + if (ftpcmd(NULL, NULL, sfp, buf) != 226) + error_msg_and_die("ftp error: %s", buf+4); + ftpcmd("QUIT", NULL, sfp, buf); + } + + exit(EXIT_SUCCESS); } -void parse_url(char *url, char **uri_host, int *uri_port, char **uri_path) +void parse_url(char *url, struct host_info *h) { - char *cp, *sp; - - *uri_port = 80; - - if (strncmp(url, "http://", 7) != 0) - error_msg_and_die("not an http url: %s", url); + char *cp, *sp, *up; + + if (strncmp(url, "http://", 7) == 0) { + h->port = 80; + h->host = url + 7; + h->is_ftp = 0; + } else if (strncmp(url, "ftp://", 6) == 0) { + h->port = 21; + h->host = url + 6; + h->is_ftp = 1; + } else + error_msg_and_die("not an http or ftp url: %s", url); - *uri_host = url + 7; + sp = strchr(h->host, '/'); + if (sp != NULL) { + *sp++ = '\0'; + h->path = sp; + } else + h->path = ""; - cp = strchr(*uri_host, ':'); - sp = strchr(*uri_host, '/'); + up = strrchr(h->host, '@'); + if (up != NULL) { + h->user = h->host; + *up++ = '\0'; + h->host = up; + } else + h->user = NULL; - if (cp != NULL && (sp == NULL || cp < sp)) { + cp = strchr(h->host, ':'); + if (cp != NULL) { *cp++ = '\0'; - *uri_port = atoi(cp); + h->port = atoi(cp); } - if (sp != NULL) { - *sp++ = '\0'; - *uri_path = sp; - } else - *uri_path = ""; } @@ -364,6 +530,25 @@ char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc) return hdrval; } +static int ftpcmd(char *s1, char *s2, FILE *fp, char *buf) +{ + char *p; + + if (s1) { + if (!s2) s2=""; + fprintf(fp, "%s%s\n", s1, s2); + fflush(fp); + } + + do { + p = fgets(buf, 510, fp); + if (!p) + perror_msg_and_die("fgets()"); + } while (! isdigit(buf[0]) || buf[3] != ' '); + + return atoi(buf); +} + #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. @@ -534,7 +719,7 @@ progressmeter(int flag) * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * $Id: wget.c,v 1.30 2001/03/21 07:34:26 andersen Exp $ + * $Id: wget.c,v 1.31 2001/04/05 21:45:53 andersen Exp $ */ |