4 * Copyright (C) 2011-2013 Simon Ruderich
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include "connection.h"
30 /* Maximum length of a HTTP request line. Longer request lines are aborted
31 * with an error. The standard doesn't specify a maximum line length but this
32 * should be a good limit to make processing simpler. As HTTPS is used this
33 * doesn't limit long GET requests. */
34 #define MAX_REQUEST_LINE 4096
36 /* Format string used to send HTTP/1.0 error responses to the client.
38 * %s is used 4 times, first three are the error code (no %n$s!), the last is
40 #define HTTP_RESPONSE_FORMAT "HTTP/1.0 %s\r\n\
41 Content-Type: text/html; charset=US-ASCII\r\n\
43 <!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n\
45 <head><title>%s</title></head>\n\
53 static int initialize_tls_session_client(int peer_socket,
55 gnutls_session_t *session,
56 gnutls_certificate_credentials_t *x509_cred);
57 static int initialize_tls_session_server(int peer_socket,
58 gnutls_session_t *session,
59 gnutls_certificate_credentials_t *x509_cred);
61 static int read_http_request(FILE *client_fd, char *request, size_t length);
62 static void send_bad_request(FILE *client_fd);
63 static void send_forwarding_failure(FILE *client_fd);
64 static void tls_send_invalid_cert_message(gnutls_session_t session);
66 static void transfer_data(int client, int server);
67 static int read_from_write_to(int from, int to);
68 static void transfer_data_tls(int client, int server,
69 gnutls_session_t client_session,
70 gnutls_session_t server_session);
71 static int read_from_write_to_tls(gnutls_session_t from, gnutls_session_t to,
74 static int connect_to_host(const char *hostname, const char *port);
76 static int parse_request(const char *buffer, char *host, char *port,
80 void handle_connection(int client_socket) {
82 FILE *client_fd, *server_fd;
84 char buffer[MAX_REQUEST_LINE];
85 char host[MAX_REQUEST_LINE];
88 int version_minor; /* x in HTTP/1.x */
91 /* client_x509_cred is used when talking to the client (acting as a TSL
92 * server), server_x509_cred is used when talking to the server (acting as
94 gnutls_certificate_credentials_t client_x509_cred, server_x509_cred;
96 gnutls_session_t client_session, server_session;
97 /* initialize_tls_session_*() called? - used for goto out */
98 int client_session_init, server_session_init;
99 /* gnutls_handshake() called? - used for goto out */
100 int client_session_started, server_session_started;
101 /* Validation failed? If yes we need to send the special "invalid"
103 int validation_failed;
105 LOG(LOG_DEBUG, "new connection");
110 client_session_init = 0;
111 server_session_init = 0;
112 client_session_started = 0;
113 server_session_started = 0;
114 validation_failed = 0;
116 client_fd = fdopen(client_socket, "a+");
117 if (client_fd == NULL) {
118 LOG_PERROR(LOG_WARNING, "fdopen(): client failed");
122 /* Read request line (CONNECT ..) and headers (they are discarded). */
123 result = read_http_request(client_fd, buffer, sizeof(buffer));
125 LOG(LOG_WARNING, "read_http_request(): client read error");
127 } else if (result == -2) {
128 LOG(LOG_WARNING, "read_http_request(): client EOF");
129 send_bad_request(client_fd);
133 if (parse_request(buffer, host, port, &version_minor) != 0) {
134 LOG(LOG_WARNING, "bad request: %s", buffer);
135 send_bad_request(client_fd);
139 LOG(LOG_DEBUG, "target: %s:%s (HTTP 1.%d)", host, port, version_minor);
141 /* Connect to proxy server or directly to server. */
142 if (global_proxy_host != NULL && global_proxy_port != NULL) {
143 LOG(LOG_DEBUG, "connecting to %s:%s", global_proxy_host,
145 server_socket = connect_to_host(global_proxy_host, global_proxy_port);
147 LOG(LOG_DEBUG, "connecting to %s:%s", host, port);
148 server_socket = connect_to_host(host, port);
151 if (server_socket == -1) {
152 LOG(LOG_WARNING, "failed to connect to server");
153 send_forwarding_failure(client_fd);
156 server_fd = fdopen(server_socket, "a+");
157 if (server_fd == NULL) {
158 LOG_PERROR(LOG_WARNING, "fdopen(): server failed");
159 send_forwarding_failure(client_fd);
163 /* Connect to proxy if requested (command line option). */
164 if (global_proxy_host != NULL && global_proxy_port != NULL) {
165 fprintf(server_fd, "CONNECT %s:%s HTTP/1.0\r\n", host, port);
166 fprintf(server_fd, "\r\n");
169 /* Read response line from proxy server. */
170 result = read_http_request(server_fd, buffer, sizeof(buffer));
172 LOG(LOG_WARNING, "read_http_request(): proxy read error");
173 send_forwarding_failure(client_fd);
175 } else if (result == -2) {
176 LOG(LOG_WARNING, "read_http_request(): proxy EOF");
177 send_forwarding_failure(client_fd);
181 /* Check response of proxy server. */
182 if (strncmp(buffer, "HTTP/1.0 200", 12)) {
183 LOG(LOG_WARNING, "bad proxy response: %s", buffer);
184 send_forwarding_failure(client_fd);
189 LOG(LOG_DEBUG, "connection to server established");
191 /* If the -u option is used and we don't know this hostname's server
192 * certificate then just pass through the connection and let the client
193 * verify the server certificate. */
194 if (global_passthrough_unknown) {
195 char path[TLSPROXY_MAX_PATH_LENGTH];
198 if (server_certificate_file(&file, host, path, sizeof(path)) == -2) {
199 /* We've established a connection, tell the client. */
200 fprintf(client_fd, "HTTP/1.0 200 Connection established\r\n");
201 fprintf(client_fd, "\r\n");
204 LOG(LOG_DEBUG, "transferring data");
206 /* Proxy data between client and server until one side is done
208 transfer_data(client_socket, server_socket);
210 LOG(LOG_DEBUG, "finished transferring data");
214 /* server_certificate_file() may have opened the file, close it. */
220 /* Initialize TLS client credentials to talk to the server. */
221 result = initialize_tls_session_server(server_socket, &server_session,
224 LOG(LOG_WARNING, "initialize_tls_session_server() failed");
225 send_forwarding_failure(client_fd);
228 server_session_init = 1;
230 LOG(LOG_DEBUG, "starting server TLS handshake");
232 /* Try to establish TLS handshake between us and server. */
233 result = gnutls_handshake(server_session);
234 if (result != GNUTLS_E_SUCCESS) {
235 LOG(LOG_WARNING, "server TLS handshake failed: %s",
236 gnutls_strerror(result));
237 send_forwarding_failure(client_fd);
240 server_session_started = 1;
242 LOG(LOG_DEBUG, "server TLS handshake finished");
244 /* Make sure the server certificate is valid and known. */
245 if (verify_tls_connection(server_session, host) != 0) {
246 LOG(LOG_ERROR, "server certificate validation failed!");
247 /* We'll send the error message over our TLS connection to the client,
248 * but with an invalid certificate. No data is transfered from/to the
250 validation_failed = 1;
253 /* Initialize TLS server credentials to talk to the client. */
254 result = initialize_tls_session_client(client_socket,
255 /* use a special host if the server
256 * certificate was invalid */
257 (validation_failed) ? "invalid"
262 LOG(LOG_WARNING, "initialize_tls_session_client() failed");
263 send_forwarding_failure(client_fd);
266 client_session_init = 1;
268 /* We've established a connection, tell the client. */
269 fprintf(client_fd, "HTTP/1.0 200 Connection established\r\n");
270 fprintf(client_fd, "\r\n");
273 LOG(LOG_DEBUG, "starting client TLS handshake");
275 /* Try to establish TLS handshake between client and us. */
276 result = gnutls_handshake(client_session);
277 if (result != GNUTLS_E_SUCCESS) {
278 LOG(LOG_WARNING, "client TLS handshake failed: %s",
279 gnutls_strerror(result));
280 send_forwarding_failure(client_fd);
283 client_session_started = 1;
285 LOG(LOG_DEBUG, "client TLS handshake finished");
287 /* Tell the client that the verification failed. Shouldn't be necessary as
288 * the client should terminate the connection because he received the
289 * invalid certificate but better be sure. */
290 if (validation_failed) {
291 tls_send_invalid_cert_message(client_session);
295 LOG(LOG_DEBUG, "transferring TLS data");
297 /* Proxy data between client and server until one side is done (EOF or
299 transfer_data_tls(client_socket, server_socket,
300 client_session, server_session);
302 LOG(LOG_DEBUG, "finished transferring TLS data");
305 /* Close TLS sessions if necessary. Use GNUTLS_SHUT_RDWR so the data is
306 * reliable transmitted. */
307 if (server_session_started) {
308 gnutls_bye(server_session, GNUTLS_SHUT_RDWR);
310 if (client_session_started) {
311 gnutls_bye(client_session, GNUTLS_SHUT_RDWR);
313 if (server_session_init) {
314 gnutls_deinit(server_session);
315 gnutls_certificate_free_credentials(server_x509_cred);
317 if (client_session_init) {
318 gnutls_deinit(client_session);
319 gnutls_certificate_free_cas(client_x509_cred);
320 gnutls_certificate_free_keys(client_x509_cred);
321 gnutls_certificate_free_credentials(client_x509_cred);
324 /* Close connection to server/proxy. */
325 if (server_fd != NULL) {
327 } else if (server_socket != -1) {
328 close(server_socket);
330 LOG(LOG_DEBUG, "connection to server closed");
331 /* Close connection to client. */
332 if (client_fd != NULL) {
335 close(client_socket);
337 LOG(LOG_DEBUG, "connection to client closed");
339 LOG(LOG_DEBUG, "connection finished");
343 static int initialize_tls_session_client(int peer_socket,
344 const char *hostname,
345 gnutls_session_t *session,
346 gnutls_certificate_credentials_t *x509_cred) {
348 int use_invalid_cert;
349 char path[TLSPROXY_MAX_PATH_LENGTH];
351 /* The "invalid" hostname is special. If it's used we send an invalid
352 * certificate to let the client know something is wrong. */
353 use_invalid_cert = (!strcmp(hostname, "invalid"));
355 if (proxy_certificate_path(hostname, path, sizeof(path)) != 0) {
357 "initialize_tls_session_client(): \
358 failed to get proxy certificate path");
362 result = gnutls_certificate_allocate_credentials(x509_cred);
363 if (result != GNUTLS_E_SUCCESS) {
365 "initialize_tls_session_client(): \
366 gnutls_certificate_allocate_credentials(): %s",
367 gnutls_strerror(result));
371 /* Load proxy CA file, this CA "list" is send to the client. */
372 if (!use_invalid_cert) {
373 result = gnutls_certificate_set_x509_trust_file(*x509_cred,
375 GNUTLS_X509_FMT_PEM);
378 "initialize_tls_session_client(): can't read CA file: '%s'",
380 gnutls_certificate_free_credentials(*x509_cred);
384 /* If the invalid hostname was specified do nothing, we use a self-signed
385 * certificate in this case. */
387 /* And certificate for this website and proxy's private key. */
388 if (!use_invalid_cert) {
389 result = gnutls_certificate_set_x509_key_file(*x509_cred,
390 path, PROXY_KEY_FILE,
391 GNUTLS_X509_FMT_PEM);
392 /* If the invalid hostname was specified load our special "invalid"
395 result = gnutls_certificate_set_x509_key_file(*x509_cred,
396 PROXY_INVALID_CERT_FILE,
398 GNUTLS_X509_FMT_PEM);
400 if (result != GNUTLS_E_SUCCESS) {
402 "initialize_tls_session_client(): \
403 can't read server certificate ('%s') or key file ('%s'): %s",
404 path, PROXY_KEY_FILE, gnutls_strerror(result));
405 gnutls_certificate_free_credentials(*x509_cred);
406 /* Could be a missing certificate. */
410 gnutls_certificate_set_dh_params(*x509_cred, global_tls_dh_params);
412 result = gnutls_init(session, GNUTLS_SERVER);
413 if (result != GNUTLS_E_SUCCESS) {
415 "initialize_tls_session_client(): gnutls_init(): %s",
416 gnutls_strerror(result));
417 gnutls_certificate_free_credentials(*x509_cred);
420 result = gnutls_priority_set(*session, global_tls_priority_cache);
421 if (result != GNUTLS_E_SUCCESS) {
423 "initialize_tls_session_client(): gnutls_priority_set(): %s",
424 gnutls_strerror(result));
425 gnutls_deinit(*session);
426 gnutls_certificate_free_credentials(*x509_cred);
429 result = gnutls_credentials_set(*session,
430 GNUTLS_CRD_CERTIFICATE, *x509_cred);
431 if (result != GNUTLS_E_SUCCESS) {
433 "initialize_tls_session_client(): gnutls_credentials_set(): %s",
434 gnutls_strerror(result));
435 gnutls_deinit(*session);
436 gnutls_certificate_free_credentials(*x509_cred);
440 gnutls_transport_set_ptr(*session, (gnutls_transport_ptr_t)peer_socket);
444 static int initialize_tls_session_server(int peer_socket,
445 gnutls_session_t *session,
446 gnutls_certificate_credentials_t *x509_cred) {
449 result = gnutls_certificate_allocate_credentials(x509_cred);
450 if (result != GNUTLS_E_SUCCESS) {
452 "initialize_tls_session_server(): \
453 gnutls_certificate_allocate_credentials(): %s",
454 gnutls_strerror(result));
458 result = gnutls_init(session, GNUTLS_CLIENT);
459 if (result != GNUTLS_E_SUCCESS) {
461 "initialize_tls_session_server(): gnutls_init(): %s",
462 gnutls_strerror(result));
463 gnutls_certificate_free_credentials(*x509_cred);
466 result = gnutls_priority_set(*session, global_tls_priority_cache);
467 if (result != GNUTLS_E_SUCCESS) {
469 "initialize_tls_session_server(): gnutls_priority_set(): %s",
470 gnutls_strerror(result));
471 gnutls_deinit(*session);
472 gnutls_certificate_free_credentials(*x509_cred);
475 result = gnutls_credentials_set(*session,
476 GNUTLS_CRD_CERTIFICATE, *x509_cred);
477 if (result != GNUTLS_E_SUCCESS) {
479 "initialize_tls_session_server(): gnutls_credentials_set(): %s",
480 gnutls_strerror(result));
481 gnutls_deinit(*session);
482 gnutls_certificate_free_credentials(*x509_cred);
486 gnutls_transport_set_ptr(*session, (gnutls_transport_ptr_t)peer_socket);
492 /* Read HTTP request line and headers (ignored).
494 * On success 0 is returned, -1 on client error, -2 on unexpected EOF.
496 static int read_http_request(FILE *client_fd, char *request, size_t length) {
497 char buffer[MAX_REQUEST_LINE];
499 if (fgets(request, (int)length, client_fd) == NULL) {
500 if (ferror(client_fd)) {
501 LOG_PERROR(LOG_WARNING, "read_http_request(): fgets()");
508 while (fgets(buffer, sizeof(buffer), client_fd) != NULL) {
510 if (!strcmp(buffer, "\n") || !strcmp(buffer, "\r\n")) {
514 if (ferror(client_fd)) {
515 LOG_PERROR(LOG_WARNING, "read_http_request(): fgets()");
522 static void send_bad_request(FILE *client_fd) {
523 #define RESPONSE_ERROR "400 Bad Request"
524 #define RESPONSE_MSG "Your browser sent an invalid request."
525 fprintf(client_fd, HTTP_RESPONSE_FORMAT,
526 RESPONSE_ERROR, RESPONSE_ERROR, RESPONSE_ERROR,
529 #undef RESPONSE_ERROR
532 static void send_forwarding_failure(FILE *client_fd) {
533 #define RESPONSE_ERROR "503 Forwarding failure"
534 #define RESPONSE_MSG "Failed to connect to server, check logs."
535 fprintf(client_fd, HTTP_RESPONSE_FORMAT,
536 RESPONSE_ERROR, RESPONSE_ERROR, RESPONSE_ERROR,
539 #undef RESPONSE_ERROR
542 static void tls_send_invalid_cert_message(gnutls_session_t session) {
543 #define RESPONSE_ERROR "500 Internal Server Error"
544 #define RESPONSE_MSG "Server certificate validation failed, check logs."
547 char buffer[sizeof(HTTP_RESPONSE_FORMAT) - 1 /* '\0' */
548 - 4 * 2 /* four %s */
549 + (sizeof(RESPONSE_ERROR) - 1 /* '\0' */) * 3
550 + sizeof(RESPONSE_MSG) - 1 /* '\0' */
553 result = snprintf(buffer, sizeof(buffer),
554 HTTP_RESPONSE_FORMAT,
555 RESPONSE_ERROR, RESPONSE_ERROR, RESPONSE_ERROR,
558 LOG_PERROR(LOG_ERROR,
559 "tls_send_invalid_cert_message(): snprintf failed");
561 } else if ((size_t)result >= sizeof(buffer)) {
563 "tls_send_invalid_cert_message(): snprintf buffer too short");
567 gnutls_record_send(session, buffer, sizeof(buffer) - 1);
568 /* don't send trailing '\0' */
569 #undef RESPONSE_ERROR
574 /* Transfer data between client and server sockets until one closes the
576 static void transfer_data(int client, int server) {
577 struct pollfd fds[2];
579 fds[0].events = POLLIN | POLLPRI | POLLHUP | POLLERR;
582 fds[1].events = POLLIN | POLLPRI | POLLHUP | POLLERR;
586 int result = poll(fds, 2 /* fd count */, -1 /* no timeout */);
588 LOG_PERROR(LOG_ERROR, "transfer_data(): poll()");
592 /* Data available from client. */
593 if (fds[0].revents & POLLIN || fds[0].revents & POLLPRI) {
594 if (read_from_write_to(client, server) != 0) {
595 /* EOF (or other error) */
599 /* Data available from server. */
600 if (fds[1].revents & POLLIN || fds[1].revents & POLLPRI) {
601 if (read_from_write_to(server, client) != 0) {
602 /* EOF (or other error) */
607 /* Client closed connection. */
608 if (fds[0].revents & POLLERR || fds[0].revents & POLLHUP) {
611 /* Server closed connection. */
612 if (fds[1].revents & POLLERR || fds[1].revents & POLLHUP) {
618 /* Read available data from socket from and write it to socket to. At maximum
619 * 4096 bytes are read/written. */
620 static int read_from_write_to(int from, int to) {
622 ssize_t size_written;
625 LOG(LOG_DEBUG, "read_from_write_to(): %d -> %d", from, to);
627 size_read = read(from, buffer, sizeof(buffer));
629 LOG_PERROR(LOG_WARNING, "read_from_write_to(): read()");
632 } else if (size_read == 0) {
636 size_written = write(to, buffer, (size_t)size_read);
637 if (size_written < 0) {
638 LOG_PERROR(LOG_WARNING, "read_from_write_to(): write()");
641 if (size_read != size_written) {
642 LOG(LOG_ERROR, "read_from_write_to(): only written %ld of %ld bytes!",
643 (long int)size_written, (long int)size_read);
650 /* Transfer data between client and server TLS connection until one closes the
652 static void transfer_data_tls(int client, int server,
653 gnutls_session_t client_session,
654 gnutls_session_t server_session) {
657 struct pollfd fds[2];
659 fds[0].events = POLLIN | POLLPRI | POLLHUP | POLLERR;
662 fds[1].events = POLLIN | POLLPRI | POLLHUP | POLLERR;
665 /* Get maximum possible buffer size. */
666 buffer_size = gnutls_record_get_max_size(client_session);
667 if (gnutls_record_get_max_size(server_session) < buffer_size) {
668 buffer_size = gnutls_record_get_max_size(server_session);
670 LOG(LOG_DEBUG, "transfer_data_tls(): suggested buffer size: %ld",
671 (long int)buffer_size);
674 int result = poll(fds, 2 /* fd count */, -1 /* no timeout */);
676 LOG_PERROR(LOG_ERROR, "transfer_data(): poll()");
680 /* Data available from client. */
681 if (fds[0].revents & POLLIN || fds[0].revents & POLLPRI) {
682 if (read_from_write_to_tls(client_session, server_session,
684 /* EOF (or other error) */
688 /* Data available from server. */
689 if (fds[1].revents & POLLIN || fds[1].revents & POLLPRI) {
690 if (read_from_write_to_tls(server_session, client_session,
692 /* EOF (or other error) */
697 /* Client closed connection. */
698 if (fds[0].revents & POLLERR || fds[0].revents & POLLHUP) {
701 /* Server closed connection. */
702 if (fds[1].revents & POLLERR || fds[1].revents & POLLHUP) {
708 /* Read available data from session from and write to session to. */
709 static int read_from_write_to_tls(gnutls_session_t from,
711 size_t buffer_size) {
713 ssize_t size_written;
716 if (buffer_size > sizeof(buffer)) {
717 buffer_size = sizeof(buffer);
719 LOG(LOG_DEBUG, "read_from_write_to_tls(): used buffer size: %ld",
720 (long int)buffer_size);
722 size_read = gnutls_record_recv(from, buffer, buffer_size);
724 LOG(LOG_WARNING, "read_from_write_to_tls(): gnutls_record_recv(): %s",
725 gnutls_strerror((int)size_read));
728 } else if (size_read == 0) {
732 size_written = gnutls_record_send(to, buffer, (size_t)size_read);
733 if (size_written < 0) {
734 LOG(LOG_WARNING, "read_from_write_to_tls(): gnutls_record_send(): %s",
735 gnutls_strerror((int)size_written));
738 if (size_read != size_written) {
739 LOG(LOG_ERROR, "read_from_write_to_tls(): only written %ld of %ld bytes!",
740 (long int)size_written, (long int)size_read);
748 static int connect_to_host(const char *hostname, const char *port) {
749 struct addrinfo gai_hints;
750 struct addrinfo *gai_result;
754 struct addrinfo *server;
756 if (hostname == NULL || port == NULL) {
760 /* Get IP of hostname server. */
761 memset(&gai_hints, 0, sizeof(gai_hints));
762 gai_hints.ai_family = AF_UNSPEC;
763 gai_hints.ai_socktype = SOCK_STREAM;
764 gai_hints.ai_protocol = 0;
765 gai_hints.ai_flags = AI_NUMERICSERV /* given port is numeric */
766 | AI_ADDRCONFIG /* supported by this computer */
767 | AI_V4MAPPED; /* support IPv4 through IPv6 */
768 gai_return = getaddrinfo(hostname, port, &gai_hints, &gai_result);
769 if (gai_return != 0) {
770 if (gai_return == EAI_SYSTEM) {
771 LOG_PERROR(LOG_WARNING, "connect_to_host(): getaddrinfo()");
773 LOG(LOG_WARNING, "connect_to_host(): getaddrinfo(): %s",
774 gai_strerror(gai_return));
779 /* Now try to connect to each server returned by getaddrinfo(), use the
780 * first successful connect. */
781 for (server = gai_result; server != NULL; server = server->ai_next) {
782 server_socket = socket(server->ai_family,
784 server->ai_protocol);
785 if (server_socket == -1) {
786 LOG_PERROR(LOG_DEBUG, "connect_to_host(): socket(), trying next");
790 if (connect(server_socket, server->ai_addr, server->ai_addrlen) != -1) {
793 LOG_PERROR(LOG_DEBUG, "connect_to_host(): connect(), trying next");
795 close(server_socket);
797 /* Make sure we free the result from getaddrinfo(). */
798 freeaddrinfo(gai_result);
800 if (server == NULL) {
801 LOG_PERROR(LOG_WARNING, "connect_to_host(): no server found, abort");
805 return server_socket;
809 /* Parse HTTP CONNECT request string and save its parameters.
811 * The following format is expected: "CONNECT host:port HTTP/1.x".
813 * request and host must have the same size! port must be at least 6 bytes
816 static int parse_request(const char *request, char *host, char *port,
817 int *version_minor) {
818 int port_unused; /* just used to verify the port is numeric */
821 /* scanf() doesn't check spaces. */
822 if (strncmp(request, "CONNECT ", 8)) {
825 /* Check request and extract data, "host:port" is not yet separated. */
826 if (sscanf(request, "CONNECT %s HTTP/1.%d", host, version_minor) != 2) {
829 /* Make sure ":port" is there. */
830 if ((position = strchr(host, ':')) == NULL) {
833 /* Make sure port is numeric. */
834 if (sscanf(position + 1, "%d", &port_unused) != 1) {
837 /* Store it in *port. */
838 strncpy(port, position + 1, 5);
840 /* And remove port from host. */