diff options
| -rw-r--r-- | networking/wget.c | 335 |
1 files changed, 174 insertions, 161 deletions
diff --git a/networking/wget.c b/networking/wget.c index ca3acd0..5e38789 100644 --- a/networking/wget.c +++ b/networking/wget.c @@ -32,7 +32,8 @@ struct globals { unsigned lastupdate_sec; unsigned start_sec; #endif - smallint chunked; /* chunked transfer encoding */ + smallint chunked; /* chunked transfer encoding */ + smallint got_clen; /* got content-length: from server */ }; #define G (*(struct globals*)&bb_common_bufsiz1) struct BUG_G_too_big { @@ -46,7 +47,6 @@ struct BUG_G_too_big { #define curfile (G.curfile ) #define lastupdate_sec (G.lastupdate_sec ) #define start_sec (G.start_sec ) -#define chunked (G.chunked ) #define INIT_G() do { } while (0) @@ -79,7 +79,7 @@ static void progress_meter(int flag) } ratio = 100; - if (totalsize != 0 && !chunked) { + if (totalsize != 0 && !G.chunked) { /* long long helps to have it working even if !LFS */ ratio = (unsigned) (100ULL * (transferred+beg_range) / totalsize); if (ratio > 100) ratio = 100; @@ -127,7 +127,7 @@ static void progress_meter(int flag) fprintf(stderr, " - stalled -"); } else { off_t to_download = totalsize - beg_range; - if (transferred <= 0 || (int)elapsed <= 0 || transferred > to_download || chunked) { + if (transferred <= 0 || (int)elapsed <= 0 || transferred > to_download || G.chunked) { fprintf(stderr, "--:--:-- ETA"); } else { /* to_download / (transferred/elapsed) - elapsed: */ @@ -239,7 +239,6 @@ static char *base64enc_512(char buf[512], const char *str) } #endif - static FILE *open_socket(len_and_sockaddr *lsa) { FILE *fp; @@ -253,7 +252,6 @@ static FILE *open_socket(len_and_sockaddr *lsa) return fp; } - static int ftpcmd(const char *s1, const char *s2, FILE *fp, char *buf) { int result; @@ -281,7 +279,6 @@ static int ftpcmd(const char *s1, const char *s2, FILE *fp, char *buf) return result; } - static void parse_url(char *src_url, struct host_info *h) { char *url, *p, *sp; @@ -340,7 +337,6 @@ static void parse_url(char *src_url, struct host_info *h) sp = h->host; } - static char *gethdr(char *buf, size_t bufsiz, FILE *fp /*, int *istrunc*/) { char *s, *hdrval; @@ -380,7 +376,7 @@ static char *gethdr(char *buf, size_t bufsiz, FILE *fp /*, int *istrunc*/) return hdrval; } - /* Rats! The buffer isn't big enough to hold the entire header value. */ + /* Rats! The buffer isn't big enough to hold the entire header value */ while (c = getc(fp), c != EOF && c != '\n') continue; /* *istrunc = 1; */ @@ -425,30 +421,171 @@ static char *URL_escape(const char *str) } #endif +static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_sockaddr *lsa) +{ + char buf[512]; + FILE *sfp; + char *str; + int port; + + if (!target->user) + target->user = xstrdup("anonymous:busybox@"); + + sfp = open_socket(lsa); + if (ftpcmd(NULL, NULL, sfp, buf) != 220) + bb_error_msg_and_die("%s", buf+4); + + /* + * Splitting username:password pair, + * trying to log in + */ + str = strchr(target->user, ':'); + if (str) + *str++ = '\0'; + switch (ftpcmd("USER ", target->user, sfp, buf)) { + case 230: + break; + case 331: + if (ftpcmd("PASS ", str, sfp, buf) == 230) + break; + /* fall through (failed login) */ + default: + bb_error_msg_and_die("ftp login: %s", buf+4); + } + + ftpcmd("TYPE I", NULL, sfp, buf); + + /* + * Querying file size + */ + if (ftpcmd("SIZE ", target->path, sfp, buf) == 213) { + content_len = BB_STRTOOFF(buf+4, NULL, 10); + if (errno || content_len < 0) { + bb_error_msg_and_die("SIZE value is garbage"); + } + G.got_clen = 1; + } + + /* + * Entering passive mode + */ + if (ftpcmd("PASV", NULL, sfp, buf) != 227) { + pasv_error: + bb_error_msg_and_die("bad response to %s: %s", "PASV", buf); + } + // Response is "227 garbageN1,N2,N3,N4,P1,P2[)garbage] + // Server's IP is N1.N2.N3.N4 (we ignore it) + // Server's port for data connection is P1*256+P2 + str = strrchr(buf, ')'); + if (str) str[0] = '\0'; + str = strrchr(buf, ','); + if (!str) goto pasv_error; + port = xatou_range(str+1, 0, 255); + *str = '\0'; + str = strrchr(buf, ','); + if (!str) goto pasv_error; + port += xatou_range(str+1, 0, 255) * 256; + set_nport(lsa, htons(port)); + + *dfpp = open_socket(lsa); + + if (beg_range) { + sprintf(buf, "REST %"OFF_FMT"d", beg_range); + if (ftpcmd(buf, NULL, sfp, buf) == 350) + content_len -= beg_range; + } + + if (ftpcmd("RETR ", target->path, sfp, buf) > 150) + bb_error_msg_and_die("bad response to %s: %s", "RETR", buf); + + return sfp; +} + +/* Must match option string! */ +enum { + WGET_OPT_CONTINUE = (1 << 0), + WGET_OPT_SPIDER = (1 << 1), + WGET_OPT_QUIET = (1 << 2), + WGET_OPT_OUTNAME = (1 << 3), + WGET_OPT_PREFIX = (1 << 4), + WGET_OPT_PROXY = (1 << 5), + WGET_OPT_USER_AGENT = (1 << 6), + WGET_OPT_RETRIES = (1 << 7), + WGET_OPT_NETWORK_READ_TIMEOUT = (1 << 8), + WGET_OPT_PASSIVE = (1 << 9), + WGET_OPT_HEADER = (1 << 10) * ENABLE_FEATURE_WGET_LONG_OPTIONS, + WGET_OPT_POST_DATA = (1 << 11) * ENABLE_FEATURE_WGET_LONG_OPTIONS, +}; + +static void NOINLINE retrieve_file_data(FILE *dfp, int output_fd) +{ + char buf[512]; + + if (!(option_mask32 & WGET_OPT_QUIET)) + progress_meter(-1); + + if (G.chunked) + goto get_clen; + + /* Loops only if chunked */ + while (1) { + while (content_len > 0 || !G.got_clen) { + int n; + unsigned rdsz = sizeof(buf); + + if (content_len < sizeof(buf) && (G.chunked || G.got_clen)) + rdsz = (unsigned)content_len; + n = safe_fread(buf, rdsz, dfp); + if (n <= 0) { + if (ferror(dfp)) { + /* perror will not work: ferror doesn't set errno */ + bb_error_msg_and_die(bb_msg_read_error); + } + break; + } + xwrite(output_fd, buf, n); +#if ENABLE_FEATURE_WGET_STATUSBAR + transferred += n; +#endif + if (G.got_clen) + content_len -= n; + } + + if (!G.chunked) + break; + + safe_fgets(buf, sizeof(buf), dfp); /* This is a newline */ + get_clen: + safe_fgets(buf, sizeof(buf), dfp); + content_len = STRTOOFF(buf, NULL, 16); + /* FIXME: error check? */ + if (content_len == 0) + break; /* all done! */ + } + + if (!(option_mask32 & WGET_OPT_QUIET)) + progress_meter(0); +} + int wget_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int wget_main(int argc UNUSED_PARAM, char **argv) { char buf[512]; struct host_info server, target; len_and_sockaddr *lsa; - int status; - int port; - int try = 5; unsigned opt; - char *str; - char *proxy = 0; + char *proxy = NULL; char *dir_prefix = NULL; #if ENABLE_FEATURE_WGET_LONG_OPTIONS char *post_data; char *extra_headers = NULL; llist_t *headers_llist = NULL; #endif - FILE *sfp = NULL; /* socket to web/ftp server */ + FILE *sfp; /* socket to web/ftp server */ FILE *dfp; /* socket to ftp server (data) */ char *fname_out; /* where to direct output (-O) */ - bool got_clen = 0; /* got content-length: from server */ int output_fd = -1; - bool use_proxy = 1; /* Use proxies if env vars are set */ + bool use_proxy; /* Use proxies if env vars are set */ const char *proxy_flag = "on"; /* Use proxies if env vars are set */ const char *user_agent = "Wget";/* "User-Agent" header field */ @@ -457,20 +594,6 @@ int wget_main(int argc UNUSED_PARAM, char **argv) enum { KEY_content_length = 1, KEY_transfer_encoding, KEY_chunked, KEY_location }; - enum { - WGET_OPT_CONTINUE = (1 << 0), - WGET_OPT_SPIDER = (1 << 1), - WGET_OPT_QUIET = (1 << 2), - WGET_OPT_OUTNAME = (1 << 3), - WGET_OPT_PREFIX = (1 << 4), - WGET_OPT_PROXY = (1 << 5), - WGET_OPT_USER_AGENT = (1 << 6), - WGET_OPT_RETRIES = (1 << 7), - WGET_OPT_NETWORK_READ_TIMEOUT = (1 << 8), - WGET_OPT_PASSIVE = (1 << 9), - WGET_OPT_HEADER = (1 << 10) * ENABLE_FEATURE_WGET_LONG_OPTIONS, - WGET_OPT_POST_DATA = (1 << 11) * ENABLE_FEATURE_WGET_LONG_OPTIONS, - }; #if ENABLE_FEATURE_WGET_LONG_OPTIONS static const char wget_longopts[] ALIGN1 = /* name, has_arg, val */ @@ -506,10 +629,6 @@ int wget_main(int argc UNUSED_PARAM, char **argv) IF_FEATURE_WGET_LONG_OPTIONS(, &headers_llist) IF_FEATURE_WGET_LONG_OPTIONS(, &post_data) ); - if (strcmp(proxy_flag, "off") == 0) { - /* Use the proxy if necessary */ - use_proxy = 0; - } #if ENABLE_FEATURE_WGET_LONG_OPTIONS if (headers_llist) { int size = 1; @@ -526,11 +645,13 @@ int wget_main(int argc UNUSED_PARAM, char **argv) } #endif + /* TODO: compat issue: should handle "wget URL1 URL2..." */ parse_url(argv[optind], &target); server.host = target.host; server.port = target.port; /* Use the proxy if necessary */ + use_proxy = (strcmp(proxy_flag, "off") != 0); if (use_proxy) { proxy = getenv(target.is_ftp ? "ftp_proxy" : "http_proxy"); if (proxy && *proxy) { @@ -562,7 +683,8 @@ int wget_main(int argc UNUSED_PARAM, char **argv) /* Impossible? if ((opt & WGET_OPT_CONTINUE) && !fname_out) - bb_error_msg_and_die("cannot specify continue (-c) without a filename (-O)"); */ + bb_error_msg_and_die("cannot specify continue (-c) without a filename (-O)"); + */ /* Determine where to start transfer */ if (opt & WGET_OPT_CONTINUE) { @@ -571,7 +693,7 @@ int wget_main(int argc UNUSED_PARAM, char **argv) beg_range = xlseek(output_fd, 0, SEEK_END); } /* File doesn't exist. We do not create file here yet. - We are not sure it exists on remove side */ + * We are not sure it exists on remove side */ } /* We want to do exactly _one_ DNS lookup, since some @@ -584,13 +706,20 @@ int wget_main(int argc UNUSED_PARAM, char **argv) /* We leak result of xmalloc_sockaddr2dotted */ } + /* G.got_clen = 0; - already is */ + sfp = NULL; if (use_proxy || !target.is_ftp) { /* * HTTP session */ + int status; + int try = 5; + do { - got_clen = 0; - chunked = 0; + char *str; + + G.got_clen = 0; + G.chunked = 0; if (!--try) bb_error_msg_and_die("too many redirections"); @@ -599,7 +728,7 @@ int wget_main(int argc UNUSED_PARAM, char **argv) if (sfp) fclose(sfp); sfp = open_socket(lsa); - /* Send HTTP request. */ + /* Send HTTP request */ if (use_proxy) { fprintf(sfp, "GET %stp://%s/%s HTTP/1.1\r\n", target.is_ftp ? "f" : "ht", target.host, @@ -710,20 +839,20 @@ However, in real world it was observed that some web servers * Retrieve HTTP headers. */ while ((str = gethdr(buf, sizeof(buf), sfp /*, &n*/)) != NULL) { - /* gethdr did already convert the "FOO:" string to lowercase */ + /* gethdr converted "FOO:" string to lowercase */ smalluint key = index_in_strings(keywords, *&buf) + 1; if (key == KEY_content_length) { content_len = BB_STRTOOFF(str, NULL, 10); if (errno || content_len < 0) { bb_error_msg_and_die("content-length %s is garbage", str); } - got_clen = 1; + G.got_clen = 1; continue; } if (key == KEY_transfer_encoding) { if (index_in_strings(keywords, str_tolower(str)) + 1 != KEY_chunked) bb_error_msg_and_die("transfer encoding '%s' is not supported", str); - chunked = got_clen = 1; + G.chunked = G.got_clen = 1; } if (key == KEY_location) { if (str[0] == '/') @@ -746,78 +875,10 @@ However, in real world it was observed that some web servers dfp = sfp; } else { - /* * FTP session */ - if (!target.user) - target.user = xstrdup("anonymous:busybox@"); - - sfp = open_socket(lsa); - if (ftpcmd(NULL, NULL, sfp, buf) != 220) - bb_error_msg_and_die("%s", buf+4); - - /* - * Splitting username:password pair, - * trying to log in - */ - str = strchr(target.user, ':'); - if (str) - *(str++) = '\0'; - switch (ftpcmd("USER ", target.user, sfp, buf)) { - case 230: - break; - case 331: - if (ftpcmd("PASS ", str, sfp, buf) == 230) - break; - /* fall through (failed login) */ - default: - bb_error_msg_and_die("ftp login: %s", buf+4); - } - - ftpcmd("TYPE I", NULL, sfp, buf); - - /* - * Querying file size - */ - if (ftpcmd("SIZE ", target.path, sfp, buf) == 213) { - content_len = BB_STRTOOFF(buf+4, NULL, 10); - if (errno || content_len < 0) { - bb_error_msg_and_die("SIZE value is garbage"); - } - got_clen = 1; - } - - /* - * Entering passive mode - */ - if (ftpcmd("PASV", NULL, sfp, buf) != 227) { - pasv_error: - bb_error_msg_and_die("bad response to %s: %s", "PASV", buf); - } - // Response is "227 garbageN1,N2,N3,N4,P1,P2[)garbage] - // Server's IP is N1.N2.N3.N4 (we ignore it) - // Server's port for data connection is P1*256+P2 - str = strrchr(buf, ')'); - if (str) str[0] = '\0'; - str = strrchr(buf, ','); - if (!str) goto pasv_error; - port = xatou_range(str+1, 0, 255); - *str = '\0'; - str = strrchr(buf, ','); - if (!str) goto pasv_error; - port += xatou_range(str+1, 0, 255) * 256; - set_nport(lsa, htons(port)); - dfp = open_socket(lsa); - - if (beg_range) { - sprintf(buf, "REST %"OFF_FMT"d", beg_range); - if (ftpcmd(buf, NULL, sfp, buf) == 350) - content_len -= beg_range; - } - - if (ftpcmd("RETR ", target.path, sfp, buf) > 150) - bb_error_msg_and_die("bad response to %s: %s", "RETR", buf); + sfp = prepare_ftp_session(&dfp, &target, lsa); } if (opt & WGET_OPT_SPIDER) { @@ -826,11 +887,6 @@ However, in real world it was observed that some web servers return EXIT_SUCCESS; } - /* - * Retrieve file - */ - - /* Do it before progress_meter (want to have nice error message) */ if (output_fd < 0) { int o_flags = O_WRONLY | O_CREAT | O_TRUNC | O_EXCL; /* compat with wget: -O FILE can overwrite */ @@ -839,50 +895,7 @@ However, in real world it was observed that some web servers output_fd = xopen(fname_out, o_flags); } - if (!(opt & WGET_OPT_QUIET)) - progress_meter(-1); - - if (chunked) - goto get_clen; - - /* Loops only if chunked */ - while (1) { - while (content_len > 0 || !got_clen) { - int n; - unsigned rdsz = sizeof(buf); - - if (content_len < sizeof(buf) && (chunked || got_clen)) - rdsz = (unsigned)content_len; - n = safe_fread(buf, rdsz, dfp); - if (n <= 0) { - if (ferror(dfp)) { - /* perror will not work: ferror doesn't set errno */ - bb_error_msg_and_die(bb_msg_read_error); - } - break; - } - xwrite(output_fd, buf, n); -#if ENABLE_FEATURE_WGET_STATUSBAR - transferred += n; -#endif - if (got_clen) - content_len -= n; - } - - if (!chunked) - break; - - safe_fgets(buf, sizeof(buf), dfp); /* This is a newline */ - get_clen: - safe_fgets(buf, sizeof(buf), dfp); - content_len = STRTOOFF(buf, NULL, 16); - /* FIXME: error check? */ - if (content_len == 0) - break; /* all done! */ - } - - if (!(opt & WGET_OPT_QUIET)) - progress_meter(0); + retrieve_file_data(dfp, output_fd); if ((use_proxy == 0) && target.is_ftp) { fclose(dfp); |