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"
53 #include "getaddrinfo.h"
57 /* Defines to allow BeOS and Cygwin to play nice... */
60 #define fm_close(a) closesocket(a)
61 #define fm_write(a,b,c) send(a,b,c,0)
62 #define fm_peek(a,b,c) recv(a,b,c,0)
63 #define fm_read(a,b,c) recv(a,b,c,0)
65 #define fm_close(a) close(a)
66 #define fm_write(a,b,c) write(a,b,c)
67 #define fm_peek(a,b,c) recv(a,b,c, MSG_PEEK)
69 #define fm_read(a,b,c) cygwin_read(a,b,c)
70 static ssize_t cygwin_read(int sock, void *buf, size_t count);
71 #else /* ! __CYGWIN__ */
72 #define fm_read(a,b,c) read(a,b,c)
73 #endif /* __CYGWIN__ */
76 /* We need to define h_errno only if it is not already */
78 # if !HAVE_DECL_H_ERRNO
81 #endif /* ndef h_errno */
83 #ifdef HAVE_SOCKETPAIR
84 static char *const *parse_plugin(const char *plugin, const char *host, const char *service)
85 { const char **argvec;
87 char *cp, *plugin_copy;
88 unsigned int plugin_copy_len;
89 unsigned int plugin_offset = 0, plugin_copy_offset = 0;
90 unsigned int i, s = 2 * sizeof(char*), host_count = 0, service_count = 0;
91 unsigned int plugin_len = strlen(plugin);
92 unsigned int host_len = strlen(host);
93 unsigned int service_len = strlen(service);
95 for (c = p = plugin; *c; c++)
96 { if (isspace((unsigned char)*c) && !isspace((unsigned char)*p))
98 if (*p == '%' && *c == 'h')
100 if (*p == '%' && *c == 'p')
105 plugin_copy_len = plugin_len + host_len * host_count + service_len * service_count;
106 plugin_copy = (char *)malloc(plugin_copy_len + 1);
109 report(stderr, GT_("fetchmail: malloc failed\n"));
113 while (plugin_copy_offset < plugin_copy_len)
114 { if ((plugin[plugin_offset] == '%') && (plugin[plugin_offset + 1] == 'h'))
115 { strcpy(plugin_copy + plugin_copy_offset, host);
117 plugin_copy_offset += host_len;
119 else if ((plugin[plugin_offset] == '%') && (plugin[plugin_offset + 1] == 'p'))
120 { strcpy(plugin_copy + plugin_copy_offset, service);
122 plugin_copy_offset += service_len;
125 { plugin_copy[plugin_copy_offset] = plugin[plugin_offset];
127 plugin_copy_offset++;
130 plugin_copy[plugin_copy_len] = 0;
132 argvec = (const char **)malloc(s);
135 report(stderr, GT_("fetchmail: malloc failed\n"));
138 memset(argvec, 0, s);
139 for (c = p = plugin_copy, i = 0; *c; c++)
140 { if ((!isspace((unsigned char)*c)) && (c == p ? 1 : isspace((unsigned char)*p))) {
146 for (cp = plugin_copy; *cp; cp++)
147 { if (isspace((unsigned char)*cp))
150 return (char *const*)argvec;
153 static int handle_plugin(const char *host,
154 const char *service, const char *plugin)
155 /* get a socket mediated through a given external command */
161 * The author of this code, Felix von Leitner <felix@convergence.de>, says:
162 * he chose socketpair() instead of pipe() because socketpair creates
163 * bidirectional sockets while allegedly some pipe() implementations don't.
165 if (socketpair(AF_UNIX,SOCK_STREAM,0,fds))
167 report(stderr, GT_("fetchmail: socketpair failed\n"));
173 report(stderr, GT_("fetchmail: fork failed\n"));
176 /* fds[1] is the parent's end; close it for proper EOF
178 (void) close(fds[1]);
179 if ( (dup2(fds[0],0) == -1) || (dup2(fds[0],1) == -1) ) {
180 report(stderr, GT_("dup2 failed\n"));
183 /* fds[0] is now connected to 0 and 1; close it */
184 (void) close(fds[0]);
185 if (outlevel >= O_VERBOSE)
186 report(stderr, GT_("running %s (host %s service %s)\n"), plugin, host, service);
187 argvec = parse_plugin(plugin,host,service);
188 execvp(*argvec, argvec);
189 report(stderr, GT_("execvp(%s) failed\n"), *argvec);
192 default: /* parent */
196 /* fds[0] is the child's end; close it for proper EOF detection */
197 (void) close(fds[0]);
200 #endif /* HAVE_SOCKETPAIR */
204 int SockCheckOpen(int fd)
205 /* poll given socket; is it selectable? */
213 FD_ZERO(&r); FD_ZERO(&w); FD_ZERO(&e);
216 tv.tv_sec = 0; tv.tv_usec = 0;
217 rt = select(fd+1, &r, &w, &e, &tv);
218 if (rt == -1 && (errno != EAGAIN && errno != EINTR))
224 #endif /* __UNUSED__ */
226 int UnixOpen(const char *path)
229 struct sockaddr_un ad;
230 memset(&ad, 0, sizeof(ad));
231 ad.sun_family = AF_UNIX;
232 strncpy(ad.sun_path, path, sizeof(ad.sun_path)-1);
234 sock = socket( AF_UNIX, SOCK_STREAM, 0 );
241 /* Socket opened saved. Usefull if connect timeout
242 * because it can be closed.
244 mailserver_socket_temp = sock;
246 if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) < 0)
249 fm_close(sock); /* don't use SockClose, no traffic yet */
255 /* No connect timeout, then no need to set mailserver_socket_temp */
256 mailserver_socket_temp = -1;
261 int SockOpen(const char *host, const char *service,
262 const char *plugin, struct addrinfo **ai0)
264 struct addrinfo *ai, req;
267 #ifdef HAVE_SOCKETPAIR
269 return handle_plugin(host,service,plugin);
270 #endif /* HAVE_SOCKETPAIR */
272 memset(&req, 0, sizeof(struct addrinfo));
273 req.ai_socktype = SOCK_STREAM;
275 req.ai_flags = AI_ADDRCONFIG;
278 i = fm_getaddrinfo(host, service, &req, ai0);
280 report(stderr, GT_("getaddrinfo(\"%s\",\"%s\") error: %s\n"),
281 host, service, gai_strerror(i));
282 if (i == EAI_SERVICE)
283 report(stderr, GT_("Try adding the --service option (see also FAQ item R12).\n"));
288 for (ai = *ai0; ai; ai = ai->ai_next) {
292 gnie = getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof(buf), NULL, 0, NI_NUMERICHOST);
294 snprintf(buf, sizeof(buf), GT_("unknown (%s)"), gai_strerror(gnie));
295 gnie = getnameinfo(ai->ai_addr, ai->ai_addrlen, NULL, 0, pb, sizeof(pb), NI_NUMERICSERV);
297 snprintf(pb, sizeof(pb), GT_("unknown (%s)"), gai_strerror(gnie));
299 if (outlevel >= O_VERBOSE)
300 report_build(stdout, GT_("Trying to connect to %s/%s..."), buf, pb);
301 i = socket(ai->ai_family, ai->ai_socktype, 0);
303 /* mask EAFNOSUPPORT errors, they confuse users for
304 * multihomed hosts */
305 if (errno != EAFNOSUPPORT)
307 if (outlevel >= O_VERBOSE)
308 report_complete(stdout, GT_("cannot create socket: %s\n"), strerror(errno));
312 /* Save socket descriptor.
313 * Used to close the socket after connect timeout. */
314 mailserver_socket_temp = i;
316 if (connect(i, (struct sockaddr *) ai->ai_addr, ai->ai_addrlen) < 0) {
319 /* additionally, suppress IPv4 network unreach errors */
320 if (e != EAFNOSUPPORT)
323 if (outlevel >= O_VERBOSE)
324 report_complete(stdout, GT_("connection failed.\n"));
325 if (outlevel > O_SILENT)
326 report(stderr, GT_("connection to %s:%s [%s/%s] failed: %s.\n"), host, service, buf, pb, strerror(e));
331 if (outlevel >= O_VERBOSE)
332 report_complete(stdout, GT_("connected.\n"));
335 /* No connect timeout, then no need to set mailserver_socket_temp */
336 mailserver_socket_temp = -1;
341 fm_freeaddrinfo(*ai0);
351 #if defined(HAVE_STDARG_H)
352 int SockPrintf(int sock, const char* format, ...)
355 int SockPrintf(sock,format,va_alist)
364 #if defined(HAVE_STDARG_H)
365 va_start(ap, format) ;
369 vsnprintf(buf, sizeof(buf), format, ap);
371 return SockWrite(sock, buf, strlen(buf));
376 #include <openssl/ssl.h>
377 #include <openssl/err.h>
378 #include <openssl/pem.h>
379 #include <openssl/x509v3.h>
380 #include <openssl/rand.h>
382 static SSL_CTX *_ctx[FD_SETSIZE];
383 static SSL *_ssl_context[FD_SETSIZE];
385 static SSL *SSLGetContext( int );
386 #endif /* SSL_ENABLE */
388 int SockWrite(int sock, char *buf, int len)
398 if( NULL != ( ssl = SSLGetContext( sock ) ) )
399 n = SSL_write(ssl, buf, len);
401 #endif /* SSL_ENABLE */
402 n = fm_write(sock, buf, len);
412 int SockRead(int sock, char *buf, int len)
414 char *newline, *bp = buf;
432 * The reason for these gymnastics is that we want two things:
433 * (1) to read \n-terminated lines,
434 * (2) to return the true length of data read, even if the
435 * data coming in has embedded NULS.
438 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
440 /* OK... SSL_peek works a little different from MSG_PEEK
441 Problem is that SSL_peek can return 0 if there
442 is no data currently available. If, on the other
443 hand, we loose the socket, we also get a zero, but
444 the SSL_read then SEGFAULTS! To deal with this,
445 we'll check the error code any time we get a return
446 of zero from SSL_peek. If we have an error, we bail.
447 If we don't, we read one character in SSL_read and
448 loop. This should continue to work even if they
449 later change the behavior of SSL_peek
450 to "fix" this problem... :-( */
451 if ((n = SSL_peek(ssl, bp, len)) < 0) {
452 (void)SSL_get_error(ssl, n);
456 /* SSL_peek says no data... Does he mean no data
457 or did the connection blow up? If we got an error
459 if (0 != SSL_get_error(ssl, n)) {
462 /* We didn't get an error so read at least one
463 character at this point and loop */
465 /* Make sure newline start out NULL!
466 * We don't have a string to pass through
467 * the strchr at this point yet */
469 } else if ((newline = (char *)memchr(bp, '\n', n)) != NULL)
470 n = newline - bp + 1;
471 /* Matthias Andree: SSL_read can return 0, in that case
472 * we must call SSL_get_error to figure if there was
473 * an error or just a "no data" condition */
474 if ((n = SSL_read(ssl, bp, n)) <= 0) {
475 if ((n = SSL_get_error(ssl, n))) {
479 /* Check for case where our single character turned out to
480 * be a newline... (It wasn't going to get caught by
481 * the strchr above if it came from the hack... ). */
482 if( NULL == newline && 1 == n && '\n' == *bp ) {
483 /* Got our newline - this will break
484 out of the loop now */
489 #endif /* SSL_ENABLE */
493 if ((n = fm_read(sock, bp, 1)) <= 0)
495 if ((n = fm_peek(sock, bp, len)) <= 0)
498 if ((newline = (char *)memchr(bp, '\n', n)) != NULL)
499 n = newline - bp + 1;
501 if ((n = fm_read(sock, bp, n)) == -1)
503 #endif /* __BEOS__ */
514 int SockPeek(int sock)
515 /* peek at the next socket character without actually reading it */
524 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
525 n = SSL_peek(ssl, &ch, 1);
527 (void)SSL_get_error(ssl, n);
531 /* This code really needs to implement a "hold back"
532 * to simulate a functioning SSL_peek()... sigh...
533 * Has to be coordinated with the read code above.
534 * Next on the list todo... */
536 /* SSL_peek says 0... Does that mean no data
537 or did the connection blow up? If we got an error
539 if(0 != SSL_get_error(ssl, n)) {
543 /* Haven't seen this case actually occur, but...
544 if the problem in SockRead can occur, this should
545 be possible... Just not sure what to do here.
546 This should be a safe "punt" the "peek" but don't
547 "punt" the "session"... */
549 return 0; /* Give him a '\0' character */
553 #endif /* SSL_ENABLE */
554 n = fm_peek(sock, &ch, 1);
566 static char *_ssl_server_cname = NULL;
567 static int _check_fp;
568 static char *_check_digest;
569 static char *_server_label;
570 static int _depth0ck;
571 static int _prev_err;
573 SSL *SSLGetContext( int sock )
575 if( sock < 0 || (unsigned)sock > FD_SETSIZE )
577 if( _ctx[sock] == NULL )
579 return _ssl_context[sock];
583 /* ok_return (preverify_ok) is 1 if this stage of certificate verification
584 passed, or 0 if it failed. This callback lets us display informative
585 errors, and perform additional validation (e.g. CN matches) */
586 static int SSL_verify_callback( int ok_return, X509_STORE_CTX *ctx, int strict )
591 unsigned char digest[EVP_MAX_MD_SIZE];
592 char text[EVP_MAX_MD_SIZE * 3 + 1], *tp, *te;
593 const EVP_MD *digest_tp;
594 unsigned int dsz, esz;
595 X509_NAME *subj, *issuer;
598 x509_cert = X509_STORE_CTX_get_current_cert(ctx);
599 err = X509_STORE_CTX_get_error(ctx);
600 depth = X509_STORE_CTX_get_error_depth(ctx);
602 subj = X509_get_subject_name(x509_cert);
603 issuer = X509_get_issuer_name(x509_cert);
605 if (depth == 0 && !_depth0ck) {
608 if (outlevel >= O_VERBOSE) {
609 if ((i = X509_NAME_get_text_by_NID(issuer, NID_organizationName, buf, sizeof(buf))) != -1) {
610 report(stdout, GT_("Issuer Organization: %s\n"), (tt = sdump(buf, i)));
612 if ((size_t)i >= sizeof(buf) - 1)
613 report(stdout, GT_("Warning: Issuer Organization Name too long (possibly truncated).\n"));
615 report(stdout, GT_("Unknown Organization\n"));
616 if ((i = X509_NAME_get_text_by_NID(issuer, NID_commonName, buf, sizeof(buf))) != -1) {
617 report(stdout, GT_("Issuer CommonName: %s\n"), (tt = sdump(buf, i)));
619 if ((size_t)i >= sizeof(buf) - 1)
620 report(stdout, GT_("Warning: Issuer CommonName too long (possibly truncated).\n"));
622 report(stdout, GT_("Unknown Issuer CommonName\n"));
624 if ((i = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, sizeof(buf))) != -1) {
625 if (outlevel >= O_VERBOSE) {
626 report(stdout, GT_("Server CommonName: %s\n"), (tt = sdump(buf, i)));
629 if ((size_t)i >= sizeof(buf) - 1) {
630 /* Possible truncation. In this case, this is a DNS name, so this
631 * is really bad. We do not tolerate this even in the non-strict case. */
632 report(stderr, GT_("Bad certificate: Subject CommonName too long!\n"));
635 if ((size_t)i > strlen(buf)) {
636 /* Name contains embedded NUL characters, so we complain. This is likely
637 * a certificate spoofing attack. */
638 report(stderr, GT_("Bad certificate: Subject CommonName contains NUL, aborting!\n"));
641 if (_ssl_server_cname != NULL) {
643 char *p2 = _ssl_server_cname;
646 STACK_OF(GENERAL_NAME) *gens;
648 /* RFC 2595 section 2.4: find a matching name
649 * first find a match among alternative names */
650 gens = (STACK_OF(GENERAL_NAME) *)X509_get_ext_d2i(x509_cert, NID_subject_alt_name, NULL, NULL);
653 for (j = 0, r = sk_GENERAL_NAME_num(gens); j < r; ++j) {
654 const GENERAL_NAME *gn = sk_GENERAL_NAME_value(gens, j);
655 if (gn->type == GEN_DNS) {
656 char *p1 = (char *)gn->d.ia5->data;
657 char *p2 = _ssl_server_cname;
658 if (outlevel >= O_VERBOSE) {
659 report(stdout, GT_("Subject Alternative Name: %s\n"), (tt = sdump(p1, (size_t)gn->d.ia5->length)));
662 /* Name contains embedded NUL characters, so we complain. This
663 * is likely a certificate spoofing attack. */
664 if ((size_t)gn->d.ia5->length != strlen(p1)) {
665 report(stderr, GT_("Bad certificate: Subject Alternative Name contains NUL, aborting!\n"));
666 sk_GENERAL_NAME_free(gens);
671 n = strlen(p2) - strlen(p1);
675 if (0 == strcasecmp(p1, p2)) {
680 sk_GENERAL_NAME_free(gens);
684 n = strlen(p2) - strlen(p1);
688 if (0 == strcasecmp(p1, p2)) {
693 GT_("Server CommonName mismatch: %s != %s\n"),
694 (tt = sdump(buf, i)), _ssl_server_cname );
696 if (ok_return && strict)
699 } else if (ok_return) {
700 report(stderr, GT_("Server name not set, could not verify certificate!\n"));
701 if (strict) return (0);
704 if (outlevel >= O_VERBOSE)
705 report(stdout, GT_("Unknown Server CommonName\n"));
706 if (ok_return && strict) {
707 report(stderr, GT_("Server name not specified in certificate!\n"));
711 /* Print the finger print. Note that on errors, we might print it more than once
712 * normally; we kluge around that by using a global variable. */
713 if (_check_fp == 1) {
717 digest_tp = EVP_md5();
718 if (digest_tp == NULL) {
719 report(stderr, GT_("EVP_md5() failed!\n"));
722 if (!X509_digest(x509_cert, digest_tp, digest, &dsz)) {
723 report(stderr, GT_("Out of memory!\n"));
727 te = text + sizeof(text);
728 for (dp = 0; dp < dsz; dp++) {
729 esz = snprintf(tp, te - tp, dp > 0 ? ":%02X" : "%02X", digest[dp]);
730 if (esz >= (size_t)(te - tp)) {
731 report(stderr, GT_("Digest text buffer too small!\n"));
736 if (outlevel > O_NORMAL)
737 report(stdout, GT_("%s key fingerprint: %s\n"), _server_label, text);
738 if (_check_digest != NULL) {
739 if (strcasecmp(text, _check_digest) == 0) {
740 if (outlevel > O_NORMAL)
741 report(stdout, GT_("%s fingerprints match.\n"), _server_label);
743 report(stderr, GT_("%s fingerprints do not match!\n"), _server_label);
746 } /* if (_check_digest != NULL) */
747 } /* if (_check_fp) */
748 } /* if (depth == 0 && !_depth0ck) */
750 if (err != X509_V_OK && err != _prev_err && !(_check_fp != 0 && _check_digest && !strict)) {
752 report(stderr, GT_("Server certificate verification error: %s\n"), X509_verify_cert_error_string(err));
753 /* We gave the error code, but maybe we can add some more details for debugging */
755 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
756 X509_NAME_oneline(issuer, buf, sizeof(buf));
757 buf[sizeof(buf) - 1] = '\0';
758 report(stderr, GT_("unknown issuer (first %d characters): %s\n"), (int)(sizeof(buf)-1), buf);
763 * If not in strict checking mode (--sslcertck), override this
764 * and pretend that verification had succeeded.
771 static int SSL_nock_verify_callback( int ok_return, X509_STORE_CTX *ctx )
773 return SSL_verify_callback(ok_return, ctx, 0);
776 static int SSL_ck_verify_callback( int ok_return, X509_STORE_CTX *ctx )
778 return SSL_verify_callback(ok_return, ctx, 1);
782 /* get commonName from certificate set in file.
783 * commonName is stored in buffer namebuffer, limited with namebufferlen
785 static const char *SSLCertGetCN(const char *mycert,
786 char *namebuffer, size_t namebufferlen)
788 const char *ret = NULL;
790 X509 *x509_cert = NULL;
791 X509_NAME *certname = NULL;
793 if (namebuffer && namebufferlen > 0) {
794 namebuffer[0] = 0x00;
795 certBio = BIO_new_file(mycert,"r");
797 x509_cert = PEM_read_bio_X509(certBio,NULL,NULL,NULL);
801 certname = X509_get_subject_name(x509_cert);
803 X509_NAME_get_text_by_NID(certname, NID_commonName,
804 namebuffer, namebufferlen) > 0)
806 X509_free(x509_cert);
812 /* performs initial SSL handshake over the connected socket
813 * uses SSL *ssl global variable, which is currently defined
816 int SSLOpen(int sock, char *mycert, char *mykey, char *myproto, int certck, char *certpath,
817 char *fingerprint, char *servercname, char *label, char **remotename)
819 struct stat randstat;
822 SSL_load_error_strings();
823 SSLeay_add_ssl_algorithms(); /* synonym for SSL_library_init() */
826 if (stat("/dev/random", &randstat) &&
827 stat("/dev/urandom", &randstat)) {
828 /* Neither /dev/random nor /dev/urandom are present, so add
829 entropy to the SSL PRNG a hard way. */
830 for (i = 0; i < 10000 && ! RAND_status (); ++i) {
833 gettimeofday (&tv, 0);
834 buf[0] = tv.tv_usec & 0xF;
835 buf[2] = (tv.tv_usec & 0xF0) >> 4;
836 buf[3] = (tv.tv_usec & 0xF00) >> 8;
837 buf[1] = (tv.tv_usec & 0xF000) >> 12;
838 RAND_add (buf, sizeof buf, 0.1);
841 #endif /* SSL_ENABLE */
844 if( sock < 0 || (unsigned)sock > FD_SETSIZE ) {
845 report(stderr, GT_("File descriptor out of range for SSL") );
849 /* Make sure a connection referring to an older context is not left */
850 _ssl_context[sock] = NULL;
852 if(!strcasecmp("ssl2",myproto)) {
853 _ctx[sock] = SSL_CTX_new(SSLv2_client_method());
854 } else if(!strcasecmp("ssl3",myproto)) {
855 _ctx[sock] = SSL_CTX_new(SSLv3_client_method());
856 } else if(!strcasecmp("tls1",myproto)) {
857 _ctx[sock] = SSL_CTX_new(TLSv1_client_method());
858 } else if (!strcasecmp("ssl23",myproto)) {
861 fprintf(stderr,GT_("Invalid SSL protocol '%s' specified, using default (SSLv23).\n"), myproto);
866 _ctx[sock] = SSL_CTX_new(SSLv23_client_method());
868 if(_ctx[sock] == NULL) {
869 ERR_print_errors_fp(stderr);
873 SSL_CTX_set_options(_ctx[sock], SSL_OP_ALL);
876 SSL_CTX_set_verify(_ctx[sock], SSL_VERIFY_PEER, SSL_ck_verify_callback);
878 /* In this case, we do not fail if verification fails. However,
879 * we provide the callback for output and possible fingerprint checks. */
880 SSL_CTX_set_verify(_ctx[sock], SSL_VERIFY_PEER, SSL_nock_verify_callback);
883 SSL_CTX_load_verify_locations(_ctx[sock], NULL, certpath);
885 SSL_CTX_set_default_verify_paths(_ctx[sock]);
887 _ssl_context[sock] = SSL_new(_ctx[sock]);
889 if(_ssl_context[sock] == NULL) {
890 ERR_print_errors_fp(stderr);
891 SSL_CTX_free(_ctx[sock]);
896 /* This static is for the verify callback */
897 _ssl_server_cname = servercname;
898 _server_label = label;
900 _check_digest = fingerprint;
904 if( mycert || mykey ) {
906 /* Ok... He has a certificate file defined, so lets declare it. If
907 * he does NOT have a separate certificate and private key file then
908 * assume that it's a combined key and certificate file.
917 if ((!*remotename || !**remotename) && SSLCertGetCN(mycert, buffer, sizeof(buffer))) {
919 *remotename = xstrdup(buffer);
921 SSL_use_certificate_file(_ssl_context[sock], mycert, SSL_FILETYPE_PEM);
922 SSL_use_RSAPrivateKey_file(_ssl_context[sock], mykey, SSL_FILETYPE_PEM);
925 if (SSL_set_fd(_ssl_context[sock], sock) == 0
926 || SSL_connect(_ssl_context[sock]) < 1) {
927 ERR_print_errors_fp(stderr);
928 SSL_free( _ssl_context[sock] );
929 _ssl_context[sock] = NULL;
930 SSL_CTX_free(_ctx[sock]);
935 /* Paranoia: was the callback not called as we expected? */
937 report(stderr, GT_("Certificate/fingerprint verification was somehow skipped!\n"));
939 if (fingerprint != NULL || certck) {
940 if( NULL != SSLGetContext( sock ) ) {
941 /* Clean up the SSL stack */
942 SSL_shutdown( _ssl_context[sock] );
943 SSL_free( _ssl_context[sock] );
944 _ssl_context[sock] = NULL;
945 SSL_CTX_free(_ctx[sock]);
956 int SockClose(int sock)
957 /* close a socket gracefully */
960 if( NULL != SSLGetContext( sock ) ) {
961 /* Clean up the SSL stack */
962 SSL_shutdown( _ssl_context[sock] );
963 SSL_free( _ssl_context[sock] );
964 _ssl_context[sock] = NULL;
965 SSL_CTX_free(_ctx[sock]);
972 * This hangs in RedHat 6.2 after fetchmail runs for a while a
973 * FIN_WAIT2 comes up in netstat and fetchmail never returns from
974 * the recv system call. (Reported from jtnews
975 * <jtnews@bellatlantic.net>, Wed, 24 May 2000 21:26:02.)
977 * Half-close the connection first so the other end gets notified.
979 * This stops sends but allows receives (effectively, it sends a
981 if (shutdown(sock, 1) == 0) {
983 /* If there is any data still waiting in the queue, discard it.
984 * Call recv() until either it returns 0 (meaning we received a FIN)
985 * or any error occurs. This makes sure all data sent by the other
986 * side is acknowledged at the TCP level.
988 if (fm_peek(sock, &ch, 1) > 0)
989 while (fm_read(sock, &ch, 1) > 0)
992 #endif /* __UNUSED__ */
994 /* if there's an error closing at this point, not much we can do */
995 return(fm_close(sock)); /* this is guarded */
1000 * Workaround Microsoft Winsock recv/WSARecv(..., MSG_PEEK) bug.
1001 * See http://sources.redhat.com/ml/cygwin/2001-08/msg00628.html
1004 static ssize_t cygwin_read(int sock, void *buf, size_t count)
1009 if ((n = read(sock, bp, count)) == -1)
1014 if (outlevel >= O_VERBOSE)
1015 report(stdout, GT_("Cygwin socket read retry\n"));
1016 n2 = read(sock, bp + n, count - n);
1017 if (n2 == -1 || n + n2 != count) {
1018 report(stderr, GT_("Cygwin socket read retry failed!\n"));
1025 #endif /* __CYGWIN__ */
1029 * Use the chargen service to test input buffering directly.
1030 * You may have to uncomment the `chargen' service description in your
1031 * inetd.conf (and then SIGHUP inetd) for this to work. */
1034 int sock = SockOpen("localhost", "chargen", NULL);
1037 while (SockRead(sock, buf, sizeof(buf)-1))
1038 SockWrite(1, buf, strlen(buf));
1043 /* socket.c ends here */