/* This software was written by Dirk Engling It is considered beerware. Prost. Skol. Cheers or whatever. $id$ */ /* System */ #include #include #define _GNU_SOURCE #include #include #include #include #include /* Libowfat */ #include "array.h" #include "byte.h" #include "case.h" #include "iob.h" #include "ip6.h" #include "scan.h" /* Opentracker */ #include "ot_accesslist.h" #include "ot_fullscrape.h" #include "ot_http.h" #include "ot_iovec.h" #include "ot_mutex.h" #include "ot_stats.h" #include "scan_urlencoded_query.h" #include "trackerlogic.h" #ifdef WANT_NO_AUTO_FREE #define OT_IOB_INIT(B) bzero(B, sizeof(io_batch)) #else #define OT_IOB_INIT(B) iob_init_autofree(B, 0) #endif #define OT_MAXMULTISCRAPE_COUNT 64 #define OT_BATCH_LIMIT (1024 * 1024 * 16) extern char *g_redirecturl; char *g_stats_path; ssize_t g_stats_path_len; enum { SUCCESS_HTTP_HEADER_LENGTH = 80, SUCCESS_HTTP_SIZE_OFF = 17 }; static void http_senddata(const int64 sock, struct ot_workstruct *ws) { struct http_data *cookie = io_getcookie(sock); ssize_t written_size; if (!cookie) { io_close(sock); return; } /* whoever sends data is not interested in its input-array */ if (ws->keep_alive && ws->header_size != ws->request_size) { size_t rest = ws->request_size - ws->header_size; if (array_start(&cookie->request)) { memmove(array_start(&cookie->request), ws->request + ws->header_size, rest); array_truncate(&cookie->request, 1, rest); } else array_catb(&cookie->request, ws->request + ws->header_size, rest); } else array_reset(&cookie->request); written_size = write(sock, ws->reply, ws->reply_size); if ((written_size < 0) || ((written_size == ws->reply_size) && !ws->keep_alive)) { array_reset(&cookie->request); free(cookie); io_close(sock); return; } if (written_size < ws->reply_size) { char *outbuf; tai6464 t; if (!(outbuf = malloc(ws->reply_size - written_size))) { array_reset(&cookie->request); free(cookie); io_close(sock); return; } memcpy(outbuf, ws->reply + written_size, ws->reply_size - written_size); if (!cookie->batch) { cookie->batch = malloc(sizeof(io_batch)); OT_IOB_INIT(cookie->batch); cookie->batches = 1; } iob_addbuf_free(cookie->batch, outbuf, ws->reply_size - written_size); /* writeable short data sockets just have a tcp timeout */ if (!ws->keep_alive) { taia_uint(&t, 0); io_timeout(sock, t); io_dontwantread(sock); } io_wantwrite(sock); } } #define HTTPERROR_302 return http_issue_error(sock, ws, CODE_HTTPERROR_302) #define HTTPERROR_400 return http_issue_error(sock, ws, CODE_HTTPERROR_400) #define HTTPERROR_400_PARAM return http_issue_error(sock, ws, CODE_HTTPERROR_400_PARAM) #define HTTPERROR_400_COMPACT return http_issue_error(sock, ws, CODE_HTTPERROR_400_COMPACT) #define HTTPERROR_400_DOUBLEHASH return http_issue_error(sock, ws, CODE_HTTPERROR_400_PARAM) #define HTTPERROR_402_NOTMODEST return http_issue_error(sock, ws, CODE_HTTPERROR_402_NOTMODEST) #define HTTPERROR_403_IP return http_issue_error(sock, ws, CODE_HTTPERROR_403_IP) #define HTTPERROR_404 return http_issue_error(sock, ws, CODE_HTTPERROR_404) #define HTTPERROR_500 return http_issue_error(sock, ws, CODE_HTTPERROR_500) ssize_t http_issue_error(const int64 sock, struct ot_workstruct *ws, int code) { char *error_code[] = {"302 Found", "400 Invalid Request", "400 Invalid Request", "400 Invalid Request", "402 Payment Required", "403 Not Modest", "403 Access Denied", "404 Not Found", "500 Internal Server Error"}; char *title = error_code[code]; ws->reply = ws->outbuf; if (code == CODE_HTTPERROR_302) ws->reply_size = snprintf(ws->reply, G_OUTBUF_SIZE, "HTTP/1.0 302 Found\r\nContent-Length: 0\r\nLocation: %s\r\n\r\n", g_redirecturl); else ws->reply_size = snprintf(ws->reply, G_OUTBUF_SIZE, "HTTP/1.0 %s\r\nContent-Type: text/html\r\nContent-Length: %zd\r\n\r\n%s\n", title, strlen(title) + 16 - 4, title + 4); #ifdef _DEBUG_HTTPERROR fprintf(stderr, "DEBUG: invalid request was: %s\n", ws->debugbuf); #endif stats_issue_event(EVENT_FAILED, FLAG_TCP, code); http_senddata(sock, ws); return ws->reply_size = -2; } ssize_t http_sendiovecdata(const int64 sock, struct ot_workstruct *ws, int iovec_entries, struct iovec *iovector, int is_partial) { struct http_data *cookie = io_getcookie(sock); io_batch *current; char *header; const char *encoding = ""; int i; size_t header_size, size = iovec_length(&iovec_entries, (const struct iovec **)&iovector); tai6464 t; /* No cookie? Bad socket. Leave. */ if (!cookie) { iovec_free(&iovec_entries, &iovector); HTTPERROR_500; } /* If this socket collected request in a buffer, free it now */ array_reset(&cookie->request); /* If we came here, wait for the answer is over */ if (cookie->flag & STRUCT_HTTP_FLAG_WAITINGFORTASK) { io_dontwantread(sock); cookie->flag &= ~STRUCT_HTTP_FLAG_WAITINGFORTASK; } if (iovec_entries) { if (cookie->flag & STRUCT_HTTP_FLAG_GZIP) encoding = "Content-Encoding: gzip\r\n"; else if (cookie->flag & STRUCT_HTTP_FLAG_BZIP2) encoding = "Content-Encoding: bzip2\r\n"; if (!(cookie->flag & STRUCT_HTTP_FLAG_CHUNKED)) header_size = asprintf(&header, "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\n%sContent-Length: %zd\r\n\r\n", encoding, size); else { if (!(cookie->flag & STRUCT_HTTP_FLAG_CHUNKED_IN_TRANSFER)) { header_size = asprintf(&header, "HTTP/1.0 200 OK\r\nContent-Type: application/octet-stream\r\n%sTransfer-Encoding: chunked\r\n\r\n%zx\r\n", encoding, size); cookie->flag |= STRUCT_HTTP_FLAG_CHUNKED_IN_TRANSFER; } else header_size = asprintf(&header, "%zx\r\n", size); } if (!header) { iovec_free(&iovec_entries, &iovector); HTTPERROR_500; } if (!cookie->batch) { cookie->batch = malloc(sizeof(io_batch)); if (!cookie->batch) { free(header); iovec_free(&iovec_entries, &iovector); HTTPERROR_500; } OT_IOB_INIT(cookie->batch); cookie->batches = 1; } current = cookie->batch + cookie->batches - 1; iob_addbuf_free(current, header, header_size); /* Split huge iovectors into separate io_batches */ for (i = 0; i < iovec_entries; ++i) { /* If the current batch's limit is reached, try to reallocate a new batch to work on */ if (current->bytesleft > OT_BATCH_LIMIT) { io_batch *new_batch = realloc(cookie->batch, (cookie->batches + 1) * sizeof(io_batch)); if (new_batch) { cookie->batch = new_batch; current = cookie->batch + cookie->batches++; OT_IOB_INIT(current); } } iob_addbuf_free(current, iovector[i].iov_base, iovector[i].iov_len); } free(iovector); if (cookie->flag & STRUCT_HTTP_FLAG_CHUNKED_IN_TRANSFER) iob_addbuf(current, "\r\n", 2); } if ((cookie->flag & STRUCT_HTTP_FLAG_CHUNKED_IN_TRANSFER) && cookie->batch && !is_partial) { current = cookie->batch + cookie->batches - 1; iob_addbuf(current, "0\r\n\r\n", 5); cookie->flag &= ~STRUCT_HTTP_FLAG_CHUNKED_IN_TRANSFER; } /* writeable sockets timeout after 10 minutes */ taia_now(&t); taia_addsec(&t, &t, OT_CLIENT_TIMEOUT_SEND); io_timeout(sock, t); io_wantwrite(sock); return 0; } static ssize_t http_handle_stats(const int64 sock, struct ot_workstruct *ws, char *read_ptr) { static const ot_keywords keywords_main[] = {{"mode", 1}, {"format", 2}, {"info_hash", 3}, {NULL, -3}}; static const ot_keywords keywords_mode[] = {{"peer", TASK_STATS_PEERS}, {"conn", TASK_STATS_CONNS}, {"scrp", TASK_STATS_SCRAPE}, {"udp4", TASK_STATS_UDP}, {"tcp4", TASK_STATS_TCP}, {"busy", TASK_STATS_BUSY_NETWORKS}, {"torr", TASK_STATS_TORRENTS}, {"fscr", TASK_STATS_FULLSCRAPE}, {"s24s", TASK_STATS_SLASH24S}, {"tpbs", TASK_STATS_TPB}, {"herr", TASK_STATS_HTTPERRORS}, {"completed", TASK_STATS_COMPLETED}, {"top100", TASK_STATS_TOP100}, {"top10", TASK_STATS_TOP10}, {"renew", TASK_STATS_RENEW}, {"syncs", TASK_STATS_SYNCS}, {"version", TASK_STATS_VERSION}, {"everything", TASK_STATS_EVERYTHING}, {"statedump", TASK_FULLSCRAPE_TRACKERSTATE}, {"fulllog", TASK_STATS_FULLLOG}, {"woodpeckers", TASK_STATS_WOODPECKERS}, #ifdef WANT_LOG_NUMWANT {"numwants", TASK_STATS_NUMWANTS}, #endif {NULL, -3}}; static const ot_keywords keywords_format[] = {{"bin", TASK_FULLSCRAPE_TPB_BINARY}, {"ben", TASK_FULLSCRAPE}, {"url", TASK_FULLSCRAPE_TPB_URLENCODED}, {"txt", TASK_FULLSCRAPE_TPB_ASCII}, {"txtp", TASK_FULLSCRAPE_TPB_ASCII_PLUS}, {NULL, -3}}; int mode = TASK_STATS_PEERS, scanon = 1, format = 0; #ifdef WANT_RESTRICT_STATS struct http_data *cookie = io_getcookie(sock); if (!cookie || !accesslist_is_blessed(cookie->ip, OT_PERMISSION_MAY_STAT)) HTTPERROR_403_IP; #endif while (scanon) { switch (scan_find_keywords(keywords_main, &read_ptr, SCAN_SEARCHPATH_PARAM)) { case -2: scanon = 0; break; /* TERMINATOR */ case -1: HTTPERROR_400_PARAM; /* PARSE ERROR */ case -3: scan_urlencoded_skipvalue(&read_ptr); break; case 1: /* matched "mode" */ if ((mode = scan_find_keywords(keywords_mode, &read_ptr, SCAN_SEARCHPATH_VALUE)) <= 0) HTTPERROR_400_PARAM; break; case 2: /* matched "format" */ if ((format = scan_find_keywords(keywords_format, &read_ptr, SCAN_SEARCHPATH_VALUE)) <= 0) HTTPERROR_400_PARAM; break; case 3: HTTPERROR_400_PARAM; /* If the stats URL was mistakenly added as announce URL, return a 400 */ } } #ifdef WANT_FULLSCRAPE if (mode == TASK_FULLSCRAPE_TRACKERSTATE) { format = mode; mode = TASK_STATS_TPB; } if (mode == TASK_STATS_TPB) { struct http_data *cookie = io_getcookie(sock); tai6464 t; #ifdef WANT_COMPRESSION_GZIP ws->request[ws->request_size] = 0; #ifndef WANT_COMPRESSION_GZIP_ALWAYS if (strstr(read_ptr - 1, "gzip")) { #endif cookie->flag |= STRUCT_HTTP_FLAG_GZIP; format |= TASK_FLAG_GZIP; #ifndef WANT_COMPRESSION_GZIP_ALWAYS } #endif #endif /* Pass this task to the worker thread */ cookie->flag |= STRUCT_HTTP_FLAG_WAITINGFORTASK | STRUCT_HTTP_FLAG_CHUNKED; /* Clients waiting for us should not easily timeout */ taia_uint(&t, 0); io_timeout(sock, t); fullscrape_deliver(sock, format); io_dontwantread(sock); return ws->reply_size = -2; } #endif /* default format for now */ if ((mode & TASK_CLASS_MASK) == TASK_STATS) { tai6464 t; /* Complex stats also include expensive memory debugging tools */ taia_uint(&t, 0); io_timeout(sock, t); stats_deliver(sock, mode); return ws->reply_size = -2; } /* Simple stats can be answerred immediately */ return ws->reply_size = return_stats_for_tracker(ws->reply, mode, 0); } #ifdef WANT_MODEST_FULLSCRAPES static pthread_mutex_t g_modest_fullscrape_mutex = PTHREAD_MUTEX_INITIALIZER; static ot_vector g_modest_fullscrape_timeouts; typedef struct { ot_ip6 ip; ot_time last_fullscrape; } ot_scrape_log; #endif #ifdef WANT_FULLSCRAPE static ssize_t http_handle_fullscrape(const int64 sock, struct ot_workstruct *ws) { struct http_data *cookie = io_getcookie(sock); int format = 0; tai6464 t; #ifdef WANT_MODEST_FULLSCRAPES { ot_scrape_log this_peer, *new_peer; int exactmatch; memcpy(this_peer.ip, cookie->ip, sizeof(ot_ip6)); this_peer.last_fullscrape = g_now_seconds; pthread_mutex_lock(&g_modest_fullscrape_mutex); new_peer = vector_find_or_insert(&g_modest_fullscrape_timeouts, &this_peer, sizeof(ot_scrape_log), sizeof(ot_ip6), &exactmatch); if (!new_peer) { pthread_mutex_unlock(&g_modest_fullscrape_mutex); HTTPERROR_500; } if (exactmatch && (this_peer.last_fullscrape - new_peer->last_fullscrape) < OT_MODEST_PEER_TIMEOUT) { pthread_mutex_unlock(&g_modest_fullscrape_mutex); HTTPERROR_402_NOTMODEST; } memcpy(new_peer, &this_peer, sizeof(ot_scrape_log)); pthread_mutex_unlock(&g_modest_fullscrape_mutex); } #endif #ifdef WANT_COMPRESSION_GZIP ws->request[ws->request_size - 1] = 0; #ifndef WANT_COMPRESSION_GZIP_ALWAYS if (strstr(ws->request, "gzip")) { #endif cookie->flag |= STRUCT_HTTP_FLAG_GZIP; format = TASK_FLAG_GZIP; stats_issue_event(EVENT_FULLSCRAPE_REQUEST_GZIP, 0, (uintptr_t)cookie->ip); #ifndef WANT_COMPRESSION_GZIP_ALWAYS } else #endif #endif stats_issue_event(EVENT_FULLSCRAPE_REQUEST, 0, (uintptr_t)cookie->ip); #ifdef _DEBUG_HTTPERROR fprintf(stderr, "%s", ws->debugbuf); #endif /* Pass this task to the worker thread */ cookie->flag |= STRUCT_HTTP_FLAG_WAITINGFORTASK | STRUCT_HTTP_FLAG_CHUNKED; /* Clients waiting for us should not easily timeout */ taia_uint(&t, 0); io_timeout(sock, t); fullscrape_deliver(sock, TASK_FULLSCRAPE | format); io_dontwantread(sock); return ws->reply_size = -2; } #endif static ssize_t http_handle_scrape(const int64 sock, struct ot_workstruct *ws, char *read_ptr) { static const ot_keywords keywords_scrape[] = {{"info_hash", 1}, {NULL, -3}}; ot_hash *multiscrape_buf = (ot_hash *)ws->request; int scanon = 1, numwant = 0; /* This is to hack around stupid clients that send "scrape ?info_hash" */ if (read_ptr[-1] != '?') { while ((*read_ptr != '?') && (*read_ptr != '\n')) ++read_ptr; if (*read_ptr == '\n') HTTPERROR_400_PARAM; ++read_ptr; } while (scanon) { switch (scan_find_keywords(keywords_scrape, &read_ptr, SCAN_SEARCHPATH_PARAM)) { case -2: scanon = 0; break; /* TERMINATOR */ default: HTTPERROR_400_PARAM; /* PARSE ERROR */ case -3: scan_urlencoded_skipvalue(&read_ptr); break; case 1: /* matched "info_hash" */ /* ignore this, when we have less than 20 bytes */ if (scan_urlencoded_query(&read_ptr, (char *)(multiscrape_buf + numwant++), SCAN_SEARCHPATH_VALUE) != (ssize_t)sizeof(ot_hash)) HTTPERROR_400_PARAM; break; } } /* No info_hash found? Inform user */ if (!numwant) HTTPERROR_400_PARAM; /* Limit number of hashes to process */ if (numwant > OT_MAXMULTISCRAPE_COUNT) numwant = OT_MAXMULTISCRAPE_COUNT; /* Enough for http header + whole scrape string */ ws->reply_size = return_tcp_scrape_for_torrent((const ot_hash *)multiscrape_buf, numwant, ws->reply); stats_issue_event(EVENT_SCRAPE, FLAG_TCP, ws->reply_size); return ws->reply_size; } #ifdef WANT_LOG_NUMWANT unsigned long long numwants[201]; #endif #if defined(WANT_KEEPALIVE) || defined(WANT_IP_FROM_PROXY) static char *http_header(char *data, size_t byte_count, char *header) { size_t i; long sl = strlen(header); for (i = 0; i + sl + 2 < byte_count; ++i) { if (data[i] != '\n' || data[i + sl + 1] != ':') continue; if (!case_equalb(data + i + 1, sl, header)) continue; data += i + sl + 2; while (*data == ' ' || *data == '\t') ++data; return data; } return 0; } #endif static ot_keywords keywords_announce[] = {{"port", 1}, {"left", 2}, {"event", 3}, {"numwant", 4}, {"compact", 5}, {"compact6", 5}, {"info_hash", 6}, #ifdef WANT_IP_FROM_QUERY_STRING {"ip", 7}, #endif #ifdef WANT_FULLLOG_NETWORKS {"lognet", 8}, #endif {"peer_id", 9}, {NULL, -3}}; static ot_keywords keywords_announce_event[] = {{"completed", 1}, {"stopped", 2}, {NULL, -3}}; static ssize_t http_handle_announce(const int64 sock, struct ot_workstruct *ws, char *read_ptr) { int numwant, tmp, scanon; unsigned short port = 0; char *write_ptr; ssize_t len; struct http_data *cookie = io_getcookie(sock); /* This is to hack around stupid clients that send "announce ?info_hash" */ if (read_ptr[-1] != '?') { while ((*read_ptr != '?') && (*read_ptr != '\n')) ++read_ptr; if (*read_ptr == '\n') HTTPERROR_400_PARAM; ++read_ptr; } #ifdef WANT_IP_FROM_PROXY if (accesslist_is_blessed(cookie->ip, OT_PERMISSION_MAY_PROXY)) { ot_ip6 proxied_ip; char *fwd = http_header(ws->request, ws->header_size, "x-forwarded-for"); if (fwd && scan_ip6(fwd, proxied_ip)) { OT_SETIP(ws->peer, proxied_ip); } else OT_SETIP(ws->peer, cookie->ip); } else #endif OT_SETIP(ws->peer, cookie->ip); ws->peer_id = NULL; ws->hash = NULL; OT_SETPORT(ws->peer, &port); OT_PEERFLAG(ws->peer) = 0; numwant = 50; scanon = 1; while (scanon) { switch (scan_find_keywords(keywords_announce, &read_ptr, SCAN_SEARCHPATH_PARAM)) { case -2: scanon = 0; break; /* TERMINATOR */ case -1: HTTPERROR_400_PARAM; /* PARSE ERROR */ case -3: scan_urlencoded_skipvalue(&read_ptr); break; case 1: /* matched "port" */ len = scan_urlencoded_query(&read_ptr, write_ptr = read_ptr, SCAN_SEARCHPATH_VALUE); if ((len <= 0) || scan_fixed_int(write_ptr, len, &tmp) || (tmp > 0xffff)) HTTPERROR_400_PARAM; port = htons(tmp); OT_SETPORT(&ws->peer, &port); break; case 2: /* matched "left" */ if ((len = scan_urlencoded_query(&read_ptr, write_ptr = read_ptr, SCAN_SEARCHPATH_VALUE)) <= 0) HTTPERROR_400_PARAM; if (scan_fixed_int(write_ptr, len, &tmp)) tmp = 0; if (!tmp) OT_PEERFLAG(&ws->peer) |= PEER_FLAG_SEEDING; break; case 3: /* matched "event" */ switch (scan_find_keywords(keywords_announce_event, &read_ptr, SCAN_SEARCHPATH_VALUE)) { case -1: HTTPERROR_400_PARAM; case 1: /* matched "completed" */ OT_PEERFLAG(&ws->peer) |= PEER_FLAG_COMPLETED; break; case 2: /* matched "stopped" */ OT_PEERFLAG(&ws->peer) |= PEER_FLAG_STOPPED; break; default: break; } break; case 4: /* matched "numwant" */ len = scan_urlencoded_query(&read_ptr, write_ptr = read_ptr, SCAN_SEARCHPATH_VALUE); if ((len <= 0) || scan_fixed_int(write_ptr, len, &numwant)) HTTPERROR_400_PARAM; if (numwant < 0) numwant = 50; if (numwant > 200) numwant = 200; break; case 5: /* matched "compact" */ len = scan_urlencoded_query(&read_ptr, write_ptr = read_ptr, SCAN_SEARCHPATH_VALUE); if ((len <= 0) || scan_fixed_int(write_ptr, len, &tmp)) HTTPERROR_400_PARAM; if (!tmp) HTTPERROR_400_COMPACT; break; case 6: /* matched "info_hash" */ if (ws->hash) HTTPERROR_400_DOUBLEHASH; /* ignore this, when we have less than 20 bytes */ if (scan_urlencoded_query(&read_ptr, write_ptr = read_ptr, SCAN_SEARCHPATH_VALUE) != 20) HTTPERROR_400_PARAM; ws->hash = (ot_hash *)write_ptr; break; #ifdef WANT_IP_FROM_QUERY_STRING case 7: /* matched "ip" */ { char *tmp_buf1 = ws->reply, *tmp_buf2 = ws->reply + 16; len = scan_urlencoded_query(&read_ptr, tmp_buf2, SCAN_SEARCHPATH_VALUE); tmp_buf2[len] = 0; if ((len <= 0) || !scan_ip6(tmp_buf2, tmp_buf1)) HTTPERROR_400_PARAM; OT_SETIP(&ws->peer, tmp_buf1); } break; #endif #ifdef WANT_FULLLOG_NETWORKS case 8: /* matched "lognet" */ { // if( accesslist_is_blessed( cookie->ip, OT_PERMISSION_MAY_STAT ) ) { char *tmp_buf = ws->reply; ot_net net; signed short parsed, bits; len = scan_urlencoded_query(&read_ptr, tmp_buf, SCAN_SEARCHPATH_VALUE); tmp_buf[len] = 0; if (len <= 0) HTTPERROR_400_PARAM; if (*tmp_buf == '-') { loglist_reset(); return ws->reply_size = sprintf(ws->reply, "Successfully removed.\n"); } parsed = scan_ip6(tmp_buf, net.address); if (!parsed) HTTPERROR_400_PARAM; if (tmp_buf[parsed++] != '/') bits = 128; else { parsed = scan_short(tmp_buf + parsed, &bits); if (!parsed) HTTPERROR_400_PARAM; if (ip6_isv4mapped(net.address)) bits += 96; } net.bits = bits; loglist_add_network(&net); return ws->reply_size = sprintf(ws->reply, "Successfully added.\n"); //} } break; #endif case 9: /* matched "peer_id" */ /* ignore this, when we have less than 20 bytes */ if (scan_urlencoded_query(&read_ptr, write_ptr = read_ptr, SCAN_SEARCHPATH_VALUE) != 20) HTTPERROR_400_PARAM; ws->peer_id = write_ptr; break; } } #ifdef WANT_LOG_NUMWANT numwants[numwant]++; #endif /* XXX DEBUG stats_issue_event( EVENT_ACCEPT, FLAG_TCP, (uintptr_t)ws->reply ); */ /* Scanned whole query string */ if (!ws->hash) return ws->reply_size = sprintf(ws->reply, "d14:failure reason80:Your client forgot to send your torrent's info_hash. Please upgrade your client.e"); if (OT_PEERFLAG(&ws->peer) & PEER_FLAG_STOPPED) ws->reply_size = remove_peer_from_torrent(FLAG_TCP, ws); else ws->reply_size = add_peer_to_torrent_and_return_peers(FLAG_TCP, ws, numwant); stats_issue_event(EVENT_ANNOUNCE, FLAG_TCP, ws->reply_size); return ws->reply_size; } ssize_t http_handle_request(const int64 sock, struct ot_workstruct *ws) { ssize_t reply_off, len; char *read_ptr = ws->request, *write_ptr; #ifdef WANT_FULLLOG_NETWORKS struct http_data *cookie = io_getcookie(sock); if (loglist_check_address(cookie->ip)) { ot_log *log = malloc(sizeof(ot_log)); if (log) { log->size = ws->request_size; log->data = malloc(ws->request_size); log->next = 0; log->time = g_now_seconds; memcpy(log->ip, cookie->ip, sizeof(ot_ip6)); if (log->data) { memcpy(log->data, ws->request, ws->request_size); if (!g_logchain_first) g_logchain_first = g_logchain_last = log; else { g_logchain_last->next = log; g_logchain_last = log; } } else free(log); } } #endif #ifdef _DEBUG_HTTPERROR reply_off = ws->request_size; if (ws->request_size >= G_DEBUGBUF_SIZE) reply_off = G_DEBUGBUF_SIZE - 1; memcpy(ws->debugbuf, ws->request, reply_off); ws->debugbuf[reply_off] = 0; #endif /* Tell subroutines where to put reply data */ ws->reply = ws->outbuf + SUCCESS_HTTP_HEADER_LENGTH; /* This one implicitely tests strlen < 5, too -- remember, it is \n terminated */ if (memcmp(read_ptr, "GET /", 5)) HTTPERROR_400; /* Skip leading '/' */ for (read_ptr += 4; *read_ptr == '/'; ++read_ptr) ; /* Try to parse the request. In reality we abandoned requiring the url to be correct. This now only decodes url encoded characters, we check for announces and scrapes by looking for "a*" or "sc" */ len = scan_urlencoded_query(&read_ptr, write_ptr = read_ptr, SCAN_PATH); /* If parsing returned an error, leave with not found */ if (g_redirecturl && (len == -2)) HTTPERROR_302; if (len <= 0) HTTPERROR_404; /* This is the hardcore match for announce*/ if ((*write_ptr == 'a') || (*write_ptr == '?')) http_handle_announce(sock, ws, read_ptr); #ifdef WANT_FULLSCRAPE else if (!memcmp(write_ptr, "scrape HTTP/", 12)) http_handle_fullscrape(sock, ws); #endif /* This is the hardcore match for scrape */ else if (!memcmp(write_ptr, "sc", 2)) http_handle_scrape(sock, ws, read_ptr); /* All the rest is matched the standard way */ else if (len == g_stats_path_len && !memcmp(write_ptr, g_stats_path, len)) http_handle_stats(sock, ws, read_ptr); else HTTPERROR_404; /* Find out if the client wants to keep this connection alive */ ws->keep_alive = 0; #ifdef WANT_KEEPALIVE read_ptr = http_header(ws->request, ws->header_size, "connection"); if (read_ptr && (*read_ptr == 'K' || *read_ptr == 'k')) ws->keep_alive = 1; #endif /* If routines handled sending themselves, just return */ if (ws->reply_size == -2) return 0; /* If routine failed, let http error take over */ if (ws->reply_size <= 0) HTTPERROR_500; /* This one is rather ugly, so I take you step by step through it. 1. In order to avoid having two buffers, one for header and one for content, we allow all above functions from trackerlogic to write to a fixed location, leaving SUCCESS_HTTP_HEADER_LENGTH bytes in our work buffer, which is enough for the static string plus dynamic space needed to expand our Content-Length value. We reserve SUCCESS_HTTP_SIZE_OFF for its expansion and calculate the space NOT needed to expand in reply_off */ reply_off = SUCCESS_HTTP_SIZE_OFF - snprintf(ws->outbuf, 0, "%zd", ws->reply_size); ws->reply = ws->outbuf + reply_off; /* 2. Now we sprintf our header so that sprintf writes its terminating '\0' exactly one byte before content starts. Complete packet size is increased by size of header plus one byte '\n', we will copy over '\0' in next step */ ws->reply_size += 1 + sprintf(ws->reply, "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nContent-Length: %zd\r\n\r", ws->reply_size); /* 3. Finally we join both blocks neatly */ ws->outbuf[SUCCESS_HTTP_HEADER_LENGTH - 1] = '\n'; http_senddata(sock, ws); return ws->reply_size; }