2 * socket.c -- socket library functions
4 * Copyright 1998 by Eric S. Raymond.
5 * For license terms, see the file COPYING in this directory.
12 #include <ctype.h> /* isspace() */
15 #endif /* HAVE_MEMORY_H */
16 #include <sys/types.h>
18 #ifndef HAVE_NET_SOCKET_H
19 #include <sys/socket.h>
21 #include <net/socket.h>
24 #include <netinet/in.h>
25 #ifdef HAVE_ARPA_INET_H
26 #include <arpa/inet.h>
29 #if defined(STDC_HEADERS)
32 #if defined(HAVE_UNISTD_H)
35 #if defined(HAVE_STDARG_H)
40 #if TIME_WITH_SYS_TIME
41 # include <sys/time.h>
45 # include <sys/time.h>
52 #include "fetchmail.h"
55 /* Defines to allow BeOS and Cygwin to play nice... */
58 #define fm_close(a) closesocket(a)
59 #define fm_write(a,b,c) send(a,b,c,0)
60 #define fm_peek(a,b,c) recv(a,b,c,0)
61 #define fm_read(a,b,c) recv(a,b,c,0)
63 #define fm_close(a) close(a)
64 #define fm_write(a,b,c) write(a,b,c)
65 #define fm_peek(a,b,c) recv(a,b,c, MSG_PEEK)
67 #define fm_read(a,b,c) cygwin_read(a,b,c)
68 static ssize_t cygwin_read(int sock, void *buf, size_t count);
69 #else /* ! __CYGWIN__ */
70 #define fm_read(a,b,c) read(a,b,c)
71 #endif /* __CYGWIN__ */
74 /* We need to define h_errno only if it is not already */
77 #ifdef HAVE_RES_SEARCH
78 /* some versions of FreeBSD should declare this but don't */
81 /* pretend we have h_errno to avoid some #ifdef's later */
85 #endif /* ndef h_errno */
87 #ifdef HAVE_SOCKETPAIR
88 static char *const *parse_plugin(const char *plugin, const char *host, const char *service)
89 { const char **argvec;
91 char *cp, *plugin_copy;
92 unsigned int plugin_copy_len;
93 unsigned int plugin_offset = 0, plugin_copy_offset = 0;
94 unsigned int i, s = 2 * sizeof(char*), host_count = 0, service_count = 0;
95 unsigned int plugin_len = strlen(plugin);
96 unsigned int host_len = strlen(host);
97 unsigned int service_len = strlen(service);
99 for (c = p = plugin; *c; c++)
100 { if (isspace((unsigned char)*c) && !isspace((unsigned char)*p))
102 if (*p == '%' && *c == 'h')
104 if (*p == '%' && *c == 'p')
109 plugin_copy_len = plugin_len + host_len * host_count + service_len * service_count;
110 plugin_copy = malloc(plugin_copy_len + 1);
113 report(stderr, GT_("fetchmail: malloc failed\n"));
117 while (plugin_copy_offset < plugin_copy_len)
118 { if ((plugin[plugin_offset] == '%') && (plugin[plugin_offset + 1] == 'h'))
119 { strcpy(plugin_copy + plugin_copy_offset, host);
121 plugin_copy_offset += host_len;
123 else if ((plugin[plugin_offset] == '%') && (plugin[plugin_offset + 1] == 'p'))
124 { strcpy(plugin_copy + plugin_copy_offset, service);
126 plugin_copy_offset += service_len;
129 { plugin_copy[plugin_copy_offset] = plugin[plugin_offset];
131 plugin_copy_offset++;
134 plugin_copy[plugin_copy_len] = 0;
139 report(stderr, GT_("fetchmail: malloc failed\n"));
142 memset(argvec, 0, s);
143 for (c = p = plugin_copy, i = 0; *c; c++)
144 { if ((!isspace((unsigned char)*c)) && (c == p ? 1 : isspace((unsigned char)*p))) {
150 for (cp = plugin_copy; *cp; cp++)
151 { if (isspace((unsigned char)*cp))
154 return (char *const*)argvec;
157 static int handle_plugin(const char *host,
158 const char *service, const char *plugin)
159 /* get a socket mediated through a given external command */
165 * The author of this code, Felix von Leitner <felix@convergence.de>, says:
166 * he chose socketpair() instead of pipe() because socketpair creates
167 * bidirectional sockets while allegedly some pipe() implementations don't.
169 if (socketpair(AF_UNIX,SOCK_STREAM,0,fds))
171 report(stderr, GT_("fetchmail: socketpair failed\n"));
177 report(stderr, GT_("fetchmail: fork failed\n"));
180 /* fds[1] is the parent's end; close it for proper EOF
182 (void) close(fds[1]);
183 if ( (dup2(fds[0],0) == -1) || (dup2(fds[0],1) == -1) ) {
184 report(stderr, GT_("dup2 failed\n"));
187 /* fds[0] is now connected to 0 and 1; close it */
188 (void) close(fds[0]);
189 if (outlevel >= O_VERBOSE)
190 report(stderr, GT_("running %s (host %s service %s)\n"), plugin, host, service);
191 argvec = parse_plugin(plugin,host,service);
192 execvp(*argvec, argvec);
193 report(stderr, GT_("execvp(%s) failed\n"), *argvec);
196 default: /* parent */
200 /* fds[0] is the child's end; close it for proper EOF detection */
201 (void) close(fds[0]);
204 #endif /* HAVE_SOCKETPAIR */
208 int SockCheckOpen(int fd)
209 /* poll given socket; is it selectable? */
217 FD_ZERO(&r); FD_ZERO(&w); FD_ZERO(&e);
220 tv.tv_sec = 0; tv.tv_usec = 0;
221 rt = select(fd+1, &r, &w, &e, &tv);
222 if (rt == -1 && (errno != EAGAIN && errno != EINTR))
228 #endif /* __UNUSED__ */
230 int UnixOpen(const char *path)
233 struct sockaddr_un ad;
234 memset(&ad, 0, sizeof(ad));
235 ad.sun_family = AF_UNIX;
236 strncpy(ad.sun_path, path, sizeof(ad.sun_path)-1);
238 sock = socket( AF_UNIX, SOCK_STREAM, 0 );
245 /* Socket opened saved. Usefull if connect timeout
246 * because it can be closed.
248 mailserver_socket_temp = sock;
250 if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) < 0)
253 fm_close(sock); /* don't use SockClose, no traffic yet */
259 /* No connect timeout, then no need to set mailserver_socket_temp */
260 mailserver_socket_temp = -1;
266 int SockOpen(const char *host, const char *service,
269 struct addrinfo *ai, *ai0, req;
272 #ifdef HAVE_SOCKETPAIR
274 return handle_plugin(host,service,plugin);
275 #endif /* HAVE_SOCKETPAIR */
276 memset(&req, 0, sizeof(struct addrinfo));
277 req.ai_socktype = SOCK_STREAM;
279 if (getaddrinfo(host, service, &req, &ai0)) {
280 report(stderr, GT_("fetchmail: getaddrinfo(%s.%s)\n"), host,service);
285 for (ai = ai0; ai; ai = ai->ai_next) {
286 i = socket(ai->ai_family, ai->ai_socktype, 0);
290 /* Socket opened saved. Usefull if connect timeout
291 * because it can be closed.
293 mailserver_socket_temp = i;
295 if (connect(i, (struct sockaddr *) ai->ai_addr, ai->ai_addrlen) < 0) {
301 /* No connect timeout, then no need to set mailserver_socket_temp */
302 mailserver_socket_temp = -1;
311 #else /* INET6_ENABLE */
312 #ifndef HAVE_INET_ATON
314 #ifdef INADDR_BROADCAST
315 #define INADDR_NONE INADDR_BROADCAST
317 #define INADDR_NONE -1
320 #endif /* HAVE_INET_ATON */
322 int SockOpen(const char *host, const char *service,
325 int sock = -1; /* pacify -Wall */
326 #ifndef HAVE_INET_ATON
327 unsigned long inaddr;
328 #endif /* HAVE_INET_ATON */
329 struct sockaddr_in ad, **pptr;
331 int clientPort = servport(service);
333 #ifdef HAVE_SOCKETPAIR
335 return handle_plugin(host,service,plugin);
337 #endif /* HAVE_SOCKETPAIR */
342 memset(&ad, 0, sizeof(ad));
343 ad.sin_family = AF_INET;
345 /* we'll accept a quad address */
346 #ifndef HAVE_INET_ATON
347 inaddr = inet_addr((char*)host);
348 if (inaddr != INADDR_NONE)
350 memcpy(&ad.sin_addr, &inaddr, sizeof(inaddr));
352 if (inet_aton(host, &ad.sin_addr))
354 #endif /* HAVE_INET_ATON */
355 ad.sin_port = htons(clientPort);
357 sock = socket(AF_INET, SOCK_STREAM, 0);
364 /* Socket opened saved. Usefull if connect timeout because
367 mailserver_socket_temp = sock;
369 if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) < 0)
372 fm_close(sock); /* don't use SockClose, no traffic yet */
378 /* No connect timeout, then no need to set mailserver_socket_temp */
379 mailserver_socket_temp = -1;
383 hp = gethostbyname((char*)host);
391 * Add a check to make sure the address has a valid IPv4 or IPv6
392 * length. This prevents buffer spamming by a broken DNS.
394 if(hp->h_length != 4 && hp->h_length != 8)
398 GT_("fetchmail: illegal address length received for host %s\n"),host);
402 * Try all addresses of a possibly multihomed host until we get
403 * a successful connect or until we run out of addresses.
405 pptr = (struct sockaddr_in **)hp->h_addr_list;
406 for(; *pptr != NULL; pptr++)
408 sock = socket(AF_INET, SOCK_STREAM, 0);
415 /* Socket opened saved. Usefull if connect timeout because
418 mailserver_socket_temp = sock;
420 ad.sin_port = htons(clientPort);
421 memcpy(&ad.sin_addr, *pptr, sizeof(struct in_addr));
422 if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) == 0) {
423 /* No connect timeout, then no need to set mailserver_socket_temp */
424 mailserver_socket_temp = -1;
427 fm_close(sock); /* don't use SockClose, no traffic yet */
428 memset(&ad, 0, sizeof(ad));
429 ad.sin_family = AF_INET;
434 fm_close(sock); /* don't use SockClose, no traffic yet */
443 #endif /* INET6_ENABLE */
446 #if defined(HAVE_STDARG_H)
447 int SockPrintf(int sock, const char* format, ...)
450 int SockPrintf(sock,format,va_alist)
459 #if defined(HAVE_STDARG_H)
460 va_start(ap, format) ;
464 vsnprintf(buf, sizeof(buf), format, ap);
466 return SockWrite(sock, buf, strlen(buf));
471 #include <openssl/ssl.h>
472 #include <openssl/err.h>
473 #include <openssl/pem.h>
474 #include <openssl/x509.h>
475 #include <openssl/rand.h>
477 static SSL_CTX *_ctx = NULL;
478 static SSL *_ssl_context[FD_SETSIZE];
480 static SSL *SSLGetContext( int );
481 #endif /* SSL_ENABLE */
483 int SockWrite(int sock, char *buf, int len)
493 if( NULL != ( ssl = SSLGetContext( sock ) ) )
494 n = SSL_write(ssl, buf, len);
496 #endif /* SSL_ENABLE */
497 n = fm_write(sock, buf, len);
507 int SockRead(int sock, char *buf, int len)
509 char *newline, *bp = buf;
511 #ifdef FORCE_STUFFING
512 int maxavailable = 0;
530 * The reason for these gymnastics is that we want two things:
531 * (1) to read \n-terminated lines,
532 * (2) to return the true length of data read, even if the
533 * data coming in has embedded NULS.
536 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
538 /* OK... SSL_peek works a little different from MSG_PEEK
539 Problem is that SSL_peek can return 0 if there
540 is no data currently available. If, on the other
541 hand, we loose the socket, we also get a zero, but
542 the SSL_read then SEGFAULTS! To deal with this,
543 we'll check the error code any time we get a return
544 of zero from SSL_peek. If we have an error, we bail.
545 If we don't, we read one character in SSL_read and
546 loop. This should continue to work even if they
547 later change the behavior of SSL_peek
548 to "fix" this problem... :-( */
549 if ((n = SSL_peek(ssl, bp, len)) < 0) {
550 (void)SSL_get_error(ssl, n);
553 #ifdef FORCE_STUFFING
557 /* SSL_peek says no data... Does he mean no data
558 or did the connection blow up? If we got an error
560 if( 0 != ( n = SSL_get_error(ssl, n) ) ) {
563 /* We didn't get an error so read at least one
564 character at this point and loop */
566 /* Make sure newline start out NULL!
567 * We don't have a string to pass through
568 * the strchr at this point yet */
570 } else if ((newline = memchr(bp, '\n', n)) != NULL)
571 n = newline - bp + 1;
572 /* Matthias Andree: SSL_read can return 0, in that case
573 * we must cal SSL_get_error to figure if there was
574 * an error or just a "no data" condition */
575 if ((n = SSL_read(ssl, bp, n)) <= 0) {
576 if ((n = SSL_get_error(ssl, n))) {
580 /* Check for case where our single character turned out to
581 * be a newline... (It wasn't going to get caught by
582 * the strchr above if it came from the hack... ). */
583 if( NULL == newline && 1 == n && '\n' == *bp ) {
584 /* Got our newline - this will break
585 out of the loop now */
590 #endif /* SSL_ENABLE */
594 if ((n = fm_read(sock, bp, 1)) <= 0)
596 if ((n = fm_peek(sock, bp, len)) <= 0)
599 #ifdef FORCE_STUFFING
602 if ((newline = memchr(bp, '\n', n)) != NULL)
603 n = newline - bp + 1;
605 if ((n = fm_read(sock, bp, n)) == -1)
607 #endif /* __BEOS__ */
615 #ifdef FORCE_STUFFING /* too ugly to live -- besides, there's IMAP */
616 /* OK, very weird hack coming up here:
617 * When POP3 servers send us a message, they're supposed to
618 * terminate the message with a line containing only a dot. To protect
619 * against lines in the real message that might contain only a dot,
620 * they're supposed to preface any line that starts with a dot with
621 * an additional dot, which will be removed on the client side. That
622 * process, called byte-stuffing (and unstuffing) is really not the
623 * concern of this low-level routine, ordinarily, but there are some
624 * POP servers (and maybe IMAP servers too, who knows) that fail to
625 * do the byte-stuffing, and this routine is the best place to try to
626 * identify and fix that fault.
628 * Since the DOT line is supposed to come only at the end of a
629 * message, the implication is that right after we see it, the server
630 * is supposed to go back to waiting for the next command. There
631 * isn't supposed to be any more data to read after we see the dot.
632 * THEREFORE, if we see more data to be read after something that
633 * looks like the dot line, then probably the server is failing to
634 * do byte-stuffing. In that case, we'll byte-pack it for them so
635 * that the higher-level routines see things as hunky-dorey.
636 * This is not a perfect test or fix by any means (it has an
637 * obvious race condition, for one thing), but it should at least
638 * reduce the nastiness that ensues when people don't know how
639 * to write POP servers.
641 if ((maxavailable > (bp-buf)) &&
648 (buf[1] == '\n')))) {
650 memmove(buf+1, buf, (bp-buf)+1);
654 #endif /* FORCE_STUFFING */
658 int SockPeek(int sock)
659 /* peek at the next socket character without actually reading it */
668 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
669 n = SSL_peek(ssl, &ch, 1);
671 (void)SSL_get_error(ssl, n);
675 /* This code really needs to implement a "hold back"
676 * to simulate a functioning SSL_peek()... sigh...
677 * Has to be coordinated with the read code above.
678 * Next on the list todo... */
680 /* SSL_peek says 0... Does that mean no data
681 or did the connection blow up? If we got an error
683 if( 0 != ( n = SSL_get_error(ssl, n) ) ) {
687 /* Haven't seen this case actually occur, but...
688 if the problem in SockRead can occur, this should
689 be possible... Just not sure what to do here.
690 This should be a safe "punt" the "peek" but don't
691 "punt" the "session"... */
693 return 0; /* Give him a '\0' character */
697 #endif /* SSL_ENABLE */
698 n = fm_peek(sock, &ch, 1);
710 static char *_ssl_server_cname = NULL;
711 static int _check_fp;
712 static char *_check_digest;
713 static char *_server_label;
714 static int _depth0ck;
715 static int _prev_err;
717 SSL *SSLGetContext( int sock )
719 /* If SSLOpen has never initialized - just return NULL */
723 if( sock < 0 || sock > FD_SETSIZE )
725 return _ssl_context[sock];
729 /* ok_return (preverify_ok) is 1 if this stage of certificate verification
730 passed, or 0 if it failed. This callback lets us display informative
731 errors, and perform additional validation (e.g. CN matches) */
732 static int SSL_verify_callback( int ok_return, X509_STORE_CTX *ctx, int strict )
737 unsigned char digest[EVP_MAX_MD_SIZE];
738 char text[EVP_MAX_MD_SIZE * 3 + 1], *tp, *te;
739 const EVP_MD *digest_tp;
740 unsigned int dsz, i, esz;
741 X509_NAME *subj, *issuer;
743 x509_cert = X509_STORE_CTX_get_current_cert(ctx);
744 err = X509_STORE_CTX_get_error(ctx);
745 depth = X509_STORE_CTX_get_error_depth(ctx);
747 subj = X509_get_subject_name(x509_cert);
748 issuer = X509_get_issuer_name(x509_cert);
750 if (depth == 0 && !_depth0ck) {
753 if (outlevel == O_VERBOSE) {
754 if ((i = X509_NAME_get_text_by_NID(issuer, NID_organizationName, buf, sizeof(buf))) != -1) {
755 report(stdout, GT_("Issuer Organization: %s\n"), buf);
756 if (i >= sizeof(buf) - 1)
757 report(stdout, GT_("Warning: Issuer Organization Name too long (possibly truncated).\n"));
759 report(stdout, GT_("Unknown Organization\n"));
760 if ((i = X509_NAME_get_text_by_NID(issuer, NID_commonName, buf, sizeof(buf))) != -1) {
761 report(stdout, GT_("Issuer CommonName: %s\n"), buf);
762 if (i >= sizeof(buf) - 1)
763 report(stdout, GT_("Warning: Issuer CommonName too long (possibly truncated).\n"));
765 report(stdout, GT_("Unknown Issuer CommonName\n"));
767 if ((i = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, sizeof(buf))) != -1) {
768 if (outlevel == O_VERBOSE)
769 report(stdout, GT_("Server CommonName: %s\n"), buf);
770 if (i >= sizeof(buf) - 1) {
771 /* Possible truncation. In this case, this is a DNS name, so this
772 * is really bad. We do not tolerate this even in the non-strict case. */
773 report(stderr, GT_("Bad certificate: Subject CommonName too long!\n"));
776 if (_ssl_server_cname != NULL) {
778 char *p2 = _ssl_server_cname;
783 n = strlen(p2) - strlen(p1);
787 if (0 != strcasecmp(p1, p2)) {
789 GT_("Server CommonName mismatch: %s != %s\n"),
790 buf, _ssl_server_cname );
791 if (ok_return && strict)
794 } else if (ok_return) {
795 report(stderr, GT_("Server name not set, could not verify certificate!\n"));
796 if (strict) return (0);
799 if (outlevel == O_VERBOSE)
800 report(stdout, GT_("Unknown Server CommonName\n"));
801 if (ok_return && strict) {
802 report(stderr, GT_("Server name not specified in certificate!\n"));
806 /* Print the finger print. Note that on errors, we might print it more than once
807 * normally; we kluge around that by using a global variable. */
810 digest_tp = EVP_md5();
811 if (digest_tp == NULL) {
812 report(stderr, GT_("EVP_md5() failed!\n"));
815 if (!X509_digest(x509_cert, digest_tp, digest, &dsz)) {
816 report(stderr, GT_("Out of memory!\n"));
820 te = text + sizeof(text);
821 for (i = 0; i < dsz; i++) {
822 esz = snprintf(tp, te - tp, i > 0 ? ":%02X" : "%02X", digest[i]);
823 if (esz >= te - tp) {
824 report(stderr, GT_("Digest text buffer too small!\n"));
829 if (outlevel > O_NORMAL)
830 report(stdout, GT_("%s key fingerprint: %s\n"), _server_label, text);
831 if (_check_digest != NULL) {
832 if (strcmp(text, _check_digest) == 0) {
833 if (outlevel > O_NORMAL)
834 report(stdout, GT_("%s fingerprints match.\n"), _server_label);
836 if (outlevel > O_SILENT)
837 report(stderr, GT_("%s fingerprints do not match!\n"), _server_label);
844 if (err != X509_V_OK && err != _prev_err) {
846 report(stderr, GT_("Server certificate verification error: %s\n"), X509_verify_cert_error_string(err));
847 /* We gave the error code, but maybe we can add some more details for debugging */
849 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
850 X509_NAME_oneline(issuer, buf, sizeof(buf));
851 buf[sizeof(buf) - 1] = '\0';
852 report(stderr, GT_("unknown issuer (first %d characters): %s\n"), sizeof(buf)-1, buf);
861 static int SSL_nock_verify_callback( int ok_return, X509_STORE_CTX *ctx )
863 return SSL_verify_callback(ok_return, ctx, 0);
866 static int SSL_ck_verify_callback( int ok_return, X509_STORE_CTX *ctx )
868 return SSL_verify_callback(ok_return, ctx, 1);
871 /* performs initial SSL handshake over the connected socket
872 * uses SSL *ssl global variable, which is currently defined
875 int SSLOpen(int sock, char *mycert, char *mykey, char *myproto, int certck, char *certpath,
876 char *fingerprint, char *servercname, char *label)
878 struct stat randstat;
881 SSL_load_error_strings();
882 SSLeay_add_ssl_algorithms();
885 if (stat("/dev/random", &randstat) &&
886 stat("/dev/urandom", &randstat)) {
887 /* Neither /dev/random nor /dev/urandom are present, so add
888 entropy to the SSL PRNG a hard way. */
889 for (i = 0; i < 10000 && ! RAND_status (); ++i) {
892 gettimeofday (&tv, 0);
893 buf[0] = tv.tv_usec & 0xF;
894 buf[2] = (tv.tv_usec & 0xF0) >> 4;
895 buf[3] = (tv.tv_usec & 0xF00) >> 8;
896 buf[1] = (tv.tv_usec & 0xF000) >> 12;
897 RAND_add (buf, sizeof buf, 0.1);
900 #endif /* SSL_ENABLE */
903 if( sock < 0 || sock > FD_SETSIZE ) {
904 report(stderr, GT_("File descriptor out of range for SSL") );
909 /* Be picky and make sure the memory is cleared */
910 memset( _ssl_context, 0, sizeof( _ssl_context ) );
912 if(!strcmp("ssl2",myproto)) {
913 _ctx = SSL_CTX_new(SSLv2_client_method());
914 } else if(!strcmp("ssl3",myproto)) {
915 _ctx = SSL_CTX_new(SSLv3_client_method());
916 } else if(!strcmp("tls1",myproto)) {
917 _ctx = SSL_CTX_new(TLSv1_client_method());
918 } else if (!strcmp("ssl23",myproto)) {
921 fprintf(stderr,GT_("Invalid SSL protocol '%s' specified, using default (SSLv23).\n"), myproto);
926 _ctx = SSL_CTX_new(SSLv23_client_method());
929 ERR_print_errors_fp(stderr);
935 SSL_CTX_set_verify(_ctx, SSL_VERIFY_PEER, SSL_ck_verify_callback);
937 /* In this case, we do not fail if verification fails. However,
938 * we provide the callback for output and possible fingerprint checks. */
939 SSL_CTX_set_verify(_ctx, SSL_VERIFY_PEER, SSL_nock_verify_callback);
942 SSL_CTX_load_verify_locations(_ctx, NULL, certpath);
944 _ssl_context[sock] = SSL_new(_ctx);
946 if(_ssl_context[sock] == NULL) {
947 ERR_print_errors_fp(stderr);
951 /* This static is for the verify callback */
952 _ssl_server_cname = servercname;
953 _server_label = label;
955 _check_digest = fingerprint;
959 if( mycert || mykey ) {
961 /* Ok... He has a certificate file defined, so lets declare it. If
962 * he does NOT have a separate certificate and private key file then
963 * assume that it's a combined key and certificate file.
969 SSL_use_certificate_file(_ssl_context[sock], mycert, SSL_FILETYPE_PEM);
970 SSL_use_RSAPrivateKey_file(_ssl_context[sock], mykey, SSL_FILETYPE_PEM);
973 SSL_set_fd(_ssl_context[sock], sock);
975 if(SSL_connect(_ssl_context[sock]) < 1) {
976 ERR_print_errors_fp(stderr);
980 /* Paranoia: was the callback not called as we expected? */
982 report(stderr, GT_("Certificate/fingerprint verification was somehow skipped!\n"));
984 if (fingerprint != NULL || certck) {
985 if( NULL != SSLGetContext( sock ) ) {
986 /* Clean up the SSL stack */
987 SSL_free( _ssl_context[sock] );
988 _ssl_context[sock] = NULL;
998 int SockClose(int sock)
999 /* close a socket gracefully */
1002 if( NULL != SSLGetContext( sock ) ) {
1003 /* Clean up the SSL stack */
1004 SSL_free( _ssl_context[sock] );
1005 _ssl_context[sock] = NULL;
1011 * This hangs in RedHat 6.2 after fetchmail runs for a while a
1012 * FIN_WAIT2 comes up in netstat and fetchmail never returns from
1013 * the recv system call. (Reported from jtnews
1014 * <jtnews@bellatlantic.net>, Wed, 24 May 2000 21:26:02.)
1016 * Half-close the connection first so the other end gets notified.
1018 * This stops sends but allows receives (effectively, it sends a
1020 if (shutdown(sock, 1) == 0) {
1022 /* If there is any data still waiting in the queue, discard it.
1023 * Call recv() until either it returns 0 (meaning we received a FIN)
1024 * or any error occurs. This makes sure all data sent by the other
1025 * side is acknowledged at the TCP level.
1027 if (fm_peek(sock, &ch, 1) > 0)
1028 while (fm_read(sock, &ch, 1) > 0)
1031 #endif /* __UNUSED__ */
1033 /* if there's an error closing at this point, not much we can do */
1034 return(fm_close(sock)); /* this is guarded */
1039 * Workaround Microsoft Winsock recv/WSARecv(..., MSG_PEEK) bug.
1040 * See http://sources.redhat.com/ml/cygwin/2001-08/msg00628.html
1043 static ssize_t cygwin_read(int sock, void *buf, size_t count)
1048 if ((n = read(sock, bp, count)) == -1)
1053 if (outlevel >= O_VERBOSE)
1054 report(stdout, GT_("Cygwin socket read retry\n"));
1055 n2 = read(sock, bp + n, count - n);
1056 if (n2 == -1 || n + n2 != count) {
1057 report(stderr, GT_("Cygwin socket read retry failed!\n"));
1064 #endif /* __CYGWIN__ */
1068 * Use the chargen service to test input buffering directly.
1069 * You may have to uncomment the `chargen' service description in your
1070 * inetd.conf (and then SIGHUP inetd) for this to work. */
1073 int sock = SockOpen("localhost", "chargen", NULL);
1076 while (SockRead(sock, buf, sizeof(buf)-1))
1077 SockWrite(1, buf, strlen(buf));
1082 /* socket.c ends here */