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"
56 /* Defines to allow BeOS and Cygwin to play nice... */
59 #define fm_close(a) closesocket(a)
60 #define fm_write(a,b,c) send(a,b,c,0)
61 #define fm_peek(a,b,c) recv(a,b,c,0)
62 #define fm_read(a,b,c) recv(a,b,c,0)
64 #define fm_close(a) close(a)
65 #define fm_write(a,b,c) write(a,b,c)
66 #define fm_peek(a,b,c) recv(a,b,c, MSG_PEEK)
68 #define fm_read(a,b,c) cygwin_read(a,b,c)
69 static ssize_t cygwin_read(int sock, void *buf, size_t count);
70 #else /* ! __CYGWIN__ */
71 #define fm_read(a,b,c) read(a,b,c)
72 #endif /* __CYGWIN__ */
75 /* We need to define h_errno only if it is not already */
78 #ifdef HAVE_RES_SEARCH
79 /* some versions of FreeBSD should declare this but don't */
82 /* pretend we have h_errno to avoid some #ifdef's later */
86 #endif /* ndef h_errno */
88 #ifdef HAVE_SOCKETPAIR
89 static char *const *parse_plugin(const char *plugin, const char *host, const char *service)
90 { const char **argvec;
92 char *cp, *plugin_copy;
93 unsigned int plugin_copy_len;
94 unsigned int plugin_offset = 0, plugin_copy_offset = 0;
95 unsigned int i, s = 2 * sizeof(char*), host_count = 0, service_count = 0;
96 unsigned int plugin_len = strlen(plugin);
97 unsigned int host_len = strlen(host);
98 unsigned int service_len = strlen(service);
100 for (c = p = plugin; *c; c++)
101 { if (isspace((unsigned char)*c) && !isspace((unsigned char)*p))
103 if (*p == '%' && *c == 'h')
105 if (*p == '%' && *c == 'p')
110 plugin_copy_len = plugin_len + host_len * host_count + service_len * service_count;
111 plugin_copy = (char *)malloc(plugin_copy_len + 1);
114 report(stderr, GT_("fetchmail: malloc failed\n"));
118 while (plugin_copy_offset < plugin_copy_len)
119 { if ((plugin[plugin_offset] == '%') && (plugin[plugin_offset + 1] == 'h'))
120 { strcpy(plugin_copy + plugin_copy_offset, host);
122 plugin_copy_offset += host_len;
124 else if ((plugin[plugin_offset] == '%') && (plugin[plugin_offset + 1] == 'p'))
125 { strcpy(plugin_copy + plugin_copy_offset, service);
127 plugin_copy_offset += service_len;
130 { plugin_copy[plugin_copy_offset] = plugin[plugin_offset];
132 plugin_copy_offset++;
135 plugin_copy[plugin_copy_len] = 0;
137 argvec = (const char **)malloc(s);
140 report(stderr, GT_("fetchmail: malloc failed\n"));
143 memset(argvec, 0, s);
144 for (c = p = plugin_copy, i = 0; *c; c++)
145 { if ((!isspace((unsigned char)*c)) && (c == p ? 1 : isspace((unsigned char)*p))) {
151 for (cp = plugin_copy; *cp; cp++)
152 { if (isspace((unsigned char)*cp))
155 return (char *const*)argvec;
158 static int handle_plugin(const char *host,
159 const char *service, const char *plugin)
160 /* get a socket mediated through a given external command */
166 * The author of this code, Felix von Leitner <felix@convergence.de>, says:
167 * he chose socketpair() instead of pipe() because socketpair creates
168 * bidirectional sockets while allegedly some pipe() implementations don't.
170 if (socketpair(AF_UNIX,SOCK_STREAM,0,fds))
172 report(stderr, GT_("fetchmail: socketpair failed\n"));
178 report(stderr, GT_("fetchmail: fork failed\n"));
181 /* fds[1] is the parent's end; close it for proper EOF
183 (void) close(fds[1]);
184 if ( (dup2(fds[0],0) == -1) || (dup2(fds[0],1) == -1) ) {
185 report(stderr, GT_("dup2 failed\n"));
188 /* fds[0] is now connected to 0 and 1; close it */
189 (void) close(fds[0]);
190 if (outlevel >= O_VERBOSE)
191 report(stderr, GT_("running %s (host %s service %s)\n"), plugin, host, service);
192 argvec = parse_plugin(plugin,host,service);
193 execvp(*argvec, argvec);
194 report(stderr, GT_("execvp(%s) failed\n"), *argvec);
197 default: /* parent */
201 /* fds[0] is the child's end; close it for proper EOF detection */
202 (void) close(fds[0]);
205 #endif /* HAVE_SOCKETPAIR */
209 int SockCheckOpen(int fd)
210 /* poll given socket; is it selectable? */
218 FD_ZERO(&r); FD_ZERO(&w); FD_ZERO(&e);
221 tv.tv_sec = 0; tv.tv_usec = 0;
222 rt = select(fd+1, &r, &w, &e, &tv);
223 if (rt == -1 && (errno != EAGAIN && errno != EINTR))
229 #endif /* __UNUSED__ */
231 int UnixOpen(const char *path)
234 struct sockaddr_un ad;
235 memset(&ad, 0, sizeof(ad));
236 ad.sun_family = AF_UNIX;
237 strncpy(ad.sun_path, path, sizeof(ad.sun_path)-1);
239 sock = socket( AF_UNIX, SOCK_STREAM, 0 );
246 /* Socket opened saved. Usefull if connect timeout
247 * because it can be closed.
249 mailserver_socket_temp = sock;
251 if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) < 0)
254 fm_close(sock); /* don't use SockClose, no traffic yet */
260 /* No connect timeout, then no need to set mailserver_socket_temp */
261 mailserver_socket_temp = -1;
266 int SockOpen(const char *host, const char *service,
267 const char *plugin, struct addrinfo **ai0)
269 struct addrinfo *ai, req;
272 #ifdef HAVE_SOCKETPAIR
274 return handle_plugin(host,service,plugin);
275 #endif /* HAVE_SOCKETPAIR */
277 memset(&req, 0, sizeof(struct addrinfo));
278 req.ai_socktype = SOCK_STREAM;
280 i = fm_getaddrinfo(host, service, &req, ai0);
282 report(stderr, GT_("getaddrinfo(\"%s\",\"%s\") error: %s\n"),
283 host, service, gai_strerror(i));
284 if (i == EAI_SERVICE)
285 report(stderr, GT_("Try adding the --service option (see also FAQ item R12).\n"));
290 for (ai = *ai0; ai; ai = ai->ai_next) {
294 gnie = getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof(buf), NULL, 0, NI_NUMERICHOST);
296 snprintf(buf, sizeof(buf), GT_("unknown (%s)"), gai_strerror(gnie));
297 gnie = getnameinfo(ai->ai_addr, ai->ai_addrlen, NULL, 0, pb, sizeof(pb), NI_NUMERICSERV);
299 snprintf(pb, sizeof(pb), GT_("unknown (%s)"), gai_strerror(gnie));
301 if (outlevel >= O_VERBOSE)
302 report_build(stdout, GT_("Trying to connect to %s/%s..."), buf, pb);
303 i = socket(ai->ai_family, ai->ai_socktype, 0);
305 /* mask EAFNOSUPPORT errors, they confuse users for
306 * multihomed hosts */
307 if (errno != EAFNOSUPPORT)
309 if (outlevel >= O_VERBOSE)
310 report_complete(stdout, GT_("cannot create socket: %s\n"), strerror(errno));
314 /* Save socket descriptor.
315 * Used to close the socket after connect timeout. */
316 mailserver_socket_temp = i;
318 if (connect(i, (struct sockaddr *) ai->ai_addr, ai->ai_addrlen) < 0) {
321 /* additionally, suppress IPv4 network unreach errors */
322 if (e != EAFNOSUPPORT)
325 if (outlevel >= O_VERBOSE)
326 report_complete(stdout, GT_("connection failed.\n"));
327 if (outlevel > O_SILENT)
328 report(stderr, GT_("connection to %s:%s [%s/%s] failed: %s.\n"), host, service, buf, pb, strerror(e));
333 if (outlevel >= O_VERBOSE)
334 report_complete(stdout, GT_("connected.\n"));
337 /* No connect timeout, then no need to set mailserver_socket_temp */
338 mailserver_socket_temp = -1;
343 fm_freeaddrinfo(*ai0);
353 #if defined(HAVE_STDARG_H)
354 int SockPrintf(int sock, const char* format, ...)
357 int SockPrintf(sock,format,va_alist)
366 #if defined(HAVE_STDARG_H)
367 va_start(ap, format) ;
371 vsnprintf(buf, sizeof(buf), format, ap);
373 return SockWrite(sock, buf, strlen(buf));
378 #include <openssl/ssl.h>
379 #include <openssl/err.h>
380 #include <openssl/pem.h>
381 #include <openssl/x509v3.h>
382 #include <openssl/rand.h>
384 static SSL_CTX *_ctx[FD_SETSIZE];
385 static SSL *_ssl_context[FD_SETSIZE];
387 static SSL *SSLGetContext( int );
388 #endif /* SSL_ENABLE */
390 int SockWrite(int sock, char *buf, int len)
400 if( NULL != ( ssl = SSLGetContext( sock ) ) )
401 n = SSL_write(ssl, buf, len);
403 #endif /* SSL_ENABLE */
404 n = fm_write(sock, buf, len);
414 int SockRead(int sock, char *buf, int len)
416 char *newline, *bp = buf;
418 #ifdef FORCE_STUFFING
419 int maxavailable = 0;
437 * The reason for these gymnastics is that we want two things:
438 * (1) to read \n-terminated lines,
439 * (2) to return the true length of data read, even if the
440 * data coming in has embedded NULS.
443 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
445 /* OK... SSL_peek works a little different from MSG_PEEK
446 Problem is that SSL_peek can return 0 if there
447 is no data currently available. If, on the other
448 hand, we loose the socket, we also get a zero, but
449 the SSL_read then SEGFAULTS! To deal with this,
450 we'll check the error code any time we get a return
451 of zero from SSL_peek. If we have an error, we bail.
452 If we don't, we read one character in SSL_read and
453 loop. This should continue to work even if they
454 later change the behavior of SSL_peek
455 to "fix" this problem... :-( */
456 if ((n = SSL_peek(ssl, bp, len)) < 0) {
457 (void)SSL_get_error(ssl, n);
460 #ifdef FORCE_STUFFING
464 /* SSL_peek says no data... Does he mean no data
465 or did the connection blow up? If we got an error
467 if( 0 != ( n = SSL_get_error(ssl, n) ) ) {
470 /* We didn't get an error so read at least one
471 character at this point and loop */
473 /* Make sure newline start out NULL!
474 * We don't have a string to pass through
475 * the strchr at this point yet */
477 } else if ((newline = memchr(bp, '\n', n)) != NULL)
478 n = newline - bp + 1;
479 /* Matthias Andree: SSL_read can return 0, in that case
480 * we must call SSL_get_error to figure if there was
481 * an error or just a "no data" condition */
482 if ((n = SSL_read(ssl, bp, n)) <= 0) {
483 if ((n = SSL_get_error(ssl, n))) {
487 /* Check for case where our single character turned out to
488 * be a newline... (It wasn't going to get caught by
489 * the strchr above if it came from the hack... ). */
490 if( NULL == newline && 1 == n && '\n' == *bp ) {
491 /* Got our newline - this will break
492 out of the loop now */
497 #endif /* SSL_ENABLE */
501 if ((n = fm_read(sock, bp, 1)) <= 0)
503 if ((n = fm_peek(sock, bp, len)) <= 0)
506 #ifdef FORCE_STUFFING
509 if ((newline = (char *)memchr(bp, '\n', n)) != NULL)
510 n = newline - bp + 1;
512 if ((n = fm_read(sock, bp, n)) == -1)
514 #endif /* __BEOS__ */
522 #ifdef FORCE_STUFFING /* too ugly to live -- besides, there's IMAP */
523 /* OK, very weird hack coming up here:
524 * When POP3 servers send us a message, they're supposed to
525 * terminate the message with a line containing only a dot. To protect
526 * against lines in the real message that might contain only a dot,
527 * they're supposed to preface any line that starts with a dot with
528 * an additional dot, which will be removed on the client side. That
529 * process, called byte-stuffing (and unstuffing) is really not the
530 * concern of this low-level routine, ordinarily, but there are some
531 * POP servers (and maybe IMAP servers too, who knows) that fail to
532 * do the byte-stuffing, and this routine is the best place to try to
533 * identify and fix that fault.
535 * Since the DOT line is supposed to come only at the end of a
536 * message, the implication is that right after we see it, the server
537 * is supposed to go back to waiting for the next command. There
538 * isn't supposed to be any more data to read after we see the dot.
539 * THEREFORE, if we see more data to be read after something that
540 * looks like the dot line, then probably the server is failing to
541 * do byte-stuffing. In that case, we'll byte-pack it for them so
542 * that the higher-level routines see things as hunky-dorey.
543 * This is not a perfect test or fix by any means (it has an
544 * obvious race condition, for one thing), but it should at least
545 * reduce the nastiness that ensues when people don't know how
546 * to write POP servers.
548 if ((maxavailable > (bp-buf)) &&
555 (buf[1] == '\n')))) {
557 memmove(buf+1, buf, (bp-buf)+1);
561 #endif /* FORCE_STUFFING */
565 int SockPeek(int sock)
566 /* peek at the next socket character without actually reading it */
575 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
576 n = SSL_peek(ssl, &ch, 1);
578 (void)SSL_get_error(ssl, n);
582 /* This code really needs to implement a "hold back"
583 * to simulate a functioning SSL_peek()... sigh...
584 * Has to be coordinated with the read code above.
585 * Next on the list todo... */
587 /* SSL_peek says 0... Does that mean no data
588 or did the connection blow up? If we got an error
590 if( 0 != ( n = SSL_get_error(ssl, n) ) ) {
594 /* Haven't seen this case actually occur, but...
595 if the problem in SockRead can occur, this should
596 be possible... Just not sure what to do here.
597 This should be a safe "punt" the "peek" but don't
598 "punt" the "session"... */
600 return 0; /* Give him a '\0' character */
604 #endif /* SSL_ENABLE */
605 n = fm_peek(sock, &ch, 1);
617 static char *_ssl_server_cname = NULL;
618 static int _check_fp;
619 static char *_check_digest;
620 static char *_server_label;
621 static int _depth0ck;
622 static int _prev_err;
624 SSL *SSLGetContext( int sock )
626 if( sock < 0 || (unsigned)sock > FD_SETSIZE )
628 if( _ctx[sock] == NULL )
630 return _ssl_context[sock];
634 /* ok_return (preverify_ok) is 1 if this stage of certificate verification
635 passed, or 0 if it failed. This callback lets us display informative
636 errors, and perform additional validation (e.g. CN matches) */
637 static int SSL_verify_callback( int ok_return, X509_STORE_CTX *ctx, int strict )
642 unsigned char digest[EVP_MAX_MD_SIZE];
643 char text[EVP_MAX_MD_SIZE * 3 + 1], *tp, *te;
644 const EVP_MD *digest_tp;
645 unsigned int dsz, esz;
646 X509_NAME *subj, *issuer;
648 x509_cert = X509_STORE_CTX_get_current_cert(ctx);
649 err = X509_STORE_CTX_get_error(ctx);
650 depth = X509_STORE_CTX_get_error_depth(ctx);
652 subj = X509_get_subject_name(x509_cert);
653 issuer = X509_get_issuer_name(x509_cert);
655 if (depth == 0 && !_depth0ck) {
658 if (outlevel >= O_VERBOSE) {
659 if ((i = X509_NAME_get_text_by_NID(issuer, NID_organizationName, buf, sizeof(buf))) != -1) {
660 report(stdout, GT_("Issuer Organization: %s\n"), buf);
661 if ((size_t)i >= sizeof(buf) - 1)
662 report(stdout, GT_("Warning: Issuer Organization Name too long (possibly truncated).\n"));
664 report(stdout, GT_("Unknown Organization\n"));
665 if ((i = X509_NAME_get_text_by_NID(issuer, NID_commonName, buf, sizeof(buf))) != -1) {
666 report(stdout, GT_("Issuer CommonName: %s\n"), buf);
667 if ((size_t)i >= sizeof(buf) - 1)
668 report(stdout, GT_("Warning: Issuer CommonName too long (possibly truncated).\n"));
670 report(stdout, GT_("Unknown Issuer CommonName\n"));
672 if ((i = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, sizeof(buf))) != -1) {
673 if (outlevel >= O_VERBOSE)
674 report(stdout, GT_("Server CommonName: %s\n"), buf);
675 if ((size_t)i >= sizeof(buf) - 1) {
676 /* Possible truncation. In this case, this is a DNS name, so this
677 * is really bad. We do not tolerate this even in the non-strict case. */
678 report(stderr, GT_("Bad certificate: Subject CommonName too long!\n"));
681 if (_ssl_server_cname != NULL) {
683 char *p2 = _ssl_server_cname;
686 STACK_OF(GENERAL_NAME) *gens;
688 /* RFC 2595 section 2.4: find a matching name
689 * first find a match among alternative names */
690 gens = X509_get_ext_d2i(x509_cert, NID_subject_alt_name, NULL, NULL);
693 for (i = 0, r = sk_GENERAL_NAME_num(gens); i < r; ++i) {
694 const GENERAL_NAME *gn = sk_GENERAL_NAME_value(gens, i);
695 if (gn->type == GEN_DNS) {
696 char *p1 = (char *)gn->d.ia5->data;
697 char *p2 = _ssl_server_cname;
698 if (outlevel >= O_VERBOSE)
699 report(stderr, "Subject Alternative Name: %s\n", p1);
702 n = strlen(p2) - strlen(p1);
706 if (0 == strcasecmp(p1, p2)) {
711 sk_GENERAL_NAME_free(gens);
715 n = strlen(p2) - strlen(p1);
719 if (0 == strcasecmp(p1, p2)) {
724 GT_("Server CommonName mismatch: %s != %s\n"),
725 buf, _ssl_server_cname );
726 if (ok_return && strict)
729 } else if (ok_return) {
730 report(stderr, GT_("Server name not set, could not verify certificate!\n"));
731 if (strict) return (0);
734 if (outlevel >= O_VERBOSE)
735 report(stdout, GT_("Unknown Server CommonName\n"));
736 if (ok_return && strict) {
737 report(stderr, GT_("Server name not specified in certificate!\n"));
741 /* Print the finger print. Note that on errors, we might print it more than once
742 * normally; we kluge around that by using a global variable. */
743 if (_check_fp == 1) {
747 digest_tp = EVP_md5();
748 if (digest_tp == NULL) {
749 report(stderr, GT_("EVP_md5() failed!\n"));
752 if (!X509_digest(x509_cert, digest_tp, digest, &dsz)) {
753 report(stderr, GT_("Out of memory!\n"));
757 te = text + sizeof(text);
758 for (dp = 0; dp < dsz; dp++) {
759 esz = snprintf(tp, te - tp, dp > 0 ? ":%02X" : "%02X", digest[dp]);
760 if (esz >= (size_t)(te - tp)) {
761 report(stderr, GT_("Digest text buffer too small!\n"));
766 if (outlevel > O_NORMAL)
767 report(stdout, GT_("%s key fingerprint: %s\n"), _server_label, text);
768 if (_check_digest != NULL) {
769 if (strcmp(text, _check_digest) == 0) {
770 if (outlevel > O_NORMAL)
771 report(stdout, GT_("%s fingerprints match.\n"), _server_label);
773 report(stderr, GT_("%s fingerprints do not match!\n"), _server_label);
776 } /* if (_check_digest != NULL) */
777 } /* if (_check_fp) */
778 } /* if (depth == 0 && !_depth0ck) */
780 if (err != X509_V_OK && err != _prev_err && !(_check_fp != 0 && _check_digest && !strict)) {
782 report(stderr, GT_("Server certificate verification error: %s\n"), X509_verify_cert_error_string(err));
783 /* We gave the error code, but maybe we can add some more details for debugging */
785 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
786 X509_NAME_oneline(issuer, buf, sizeof(buf));
787 buf[sizeof(buf) - 1] = '\0';
788 report(stderr, GT_("unknown issuer (first %d characters): %s\n"), (int)(sizeof(buf)-1), buf);
793 * If not in strict checking mode (--sslcertck), override this
794 * and pretend that verification had succeeded.
801 static int SSL_nock_verify_callback( int ok_return, X509_STORE_CTX *ctx )
803 return SSL_verify_callback(ok_return, ctx, 0);
806 static int SSL_ck_verify_callback( int ok_return, X509_STORE_CTX *ctx )
808 return SSL_verify_callback(ok_return, ctx, 1);
812 /* get commonName from certificate set in file.
813 * commonName is stored in buffer namebuffer, limited with namebufferlen
815 static const char *SSLCertGetCN(const char *mycert,
816 char *namebuffer, size_t namebufferlen)
818 const char *ret = NULL;
820 X509 *x509_cert = NULL;
821 X509_NAME *certname = NULL;
823 if (namebuffer && namebufferlen > 0) {
824 namebuffer[0] = 0x00;
825 certBio = BIO_new_file(mycert,"r");
827 x509_cert = PEM_read_bio_X509(certBio,NULL,NULL,NULL);
831 certname = X509_get_subject_name(x509_cert);
833 X509_NAME_get_text_by_NID(certname, NID_commonName,
834 namebuffer, namebufferlen) > 0)
836 X509_free(x509_cert);
842 /* performs initial SSL handshake over the connected socket
843 * uses SSL *ssl global variable, which is currently defined
846 int SSLOpen(int sock, char *mycert, char *mykey, char *myproto, int certck, char *certpath,
847 char *fingerprint, char *servercname, char *label, char **remotename)
849 struct stat randstat;
852 SSL_load_error_strings();
853 SSLeay_add_ssl_algorithms();
856 if (stat("/dev/random", &randstat) &&
857 stat("/dev/urandom", &randstat)) {
858 /* Neither /dev/random nor /dev/urandom are present, so add
859 entropy to the SSL PRNG a hard way. */
860 for (i = 0; i < 10000 && ! RAND_status (); ++i) {
863 gettimeofday (&tv, 0);
864 buf[0] = tv.tv_usec & 0xF;
865 buf[2] = (tv.tv_usec & 0xF0) >> 4;
866 buf[3] = (tv.tv_usec & 0xF00) >> 8;
867 buf[1] = (tv.tv_usec & 0xF000) >> 12;
868 RAND_add (buf, sizeof buf, 0.1);
871 #endif /* SSL_ENABLE */
874 if( sock < 0 || (unsigned)sock > FD_SETSIZE ) {
875 report(stderr, GT_("File descriptor out of range for SSL") );
879 /* Make sure a connection referring to an older context is not left */
880 _ssl_context[sock] = NULL;
882 if(!strcasecmp("ssl2",myproto)) {
883 _ctx[sock] = SSL_CTX_new(SSLv2_client_method());
884 } else if(!strcasecmp("ssl3",myproto)) {
885 _ctx[sock] = SSL_CTX_new(SSLv3_client_method());
886 } else if(!strcasecmp("tls1",myproto)) {
887 _ctx[sock] = SSL_CTX_new(TLSv1_client_method());
888 } else if (!strcasecmp("ssl23",myproto)) {
891 fprintf(stderr,GT_("Invalid SSL protocol '%s' specified, using default (SSLv23).\n"), myproto);
896 _ctx[sock] = SSL_CTX_new(SSLv23_client_method());
898 if(_ctx[sock] == NULL) {
899 ERR_print_errors_fp(stderr);
904 SSL_CTX_set_verify(_ctx[sock], SSL_VERIFY_PEER, SSL_ck_verify_callback);
906 /* In this case, we do not fail if verification fails. However,
907 * we provide the callback for output and possible fingerprint checks. */
908 SSL_CTX_set_verify(_ctx[sock], SSL_VERIFY_PEER, SSL_nock_verify_callback);
911 SSL_CTX_load_verify_locations(_ctx[sock], NULL, certpath);
913 SSL_CTX_set_default_verify_paths(_ctx[sock]);
915 _ssl_context[sock] = SSL_new(_ctx[sock]);
917 if(_ssl_context[sock] == NULL) {
918 ERR_print_errors_fp(stderr);
919 SSL_CTX_free(_ctx[sock]);
924 /* This static is for the verify callback */
925 _ssl_server_cname = servercname;
926 _server_label = label;
928 _check_digest = fingerprint;
932 if( mycert || mykey ) {
934 /* Ok... He has a certificate file defined, so lets declare it. If
935 * he does NOT have a separate certificate and private key file then
936 * assume that it's a combined key and certificate file.
945 if ((!*remotename || !**remotename) && SSLCertGetCN(mycert, buffer, sizeof(buffer))) {
947 *remotename = xstrdup(buffer);
949 SSL_use_certificate_file(_ssl_context[sock], mycert, SSL_FILETYPE_PEM);
950 SSL_use_RSAPrivateKey_file(_ssl_context[sock], mykey, SSL_FILETYPE_PEM);
953 SSL_set_fd(_ssl_context[sock], sock);
955 if(SSL_connect(_ssl_context[sock]) < 1) {
956 ERR_print_errors_fp(stderr);
957 SSL_CTX_free(_ctx[sock]);
962 /* Paranoia: was the callback not called as we expected? */
964 report(stderr, GT_("Certificate/fingerprint verification was somehow skipped!\n"));
966 if (fingerprint != NULL || certck) {
967 if( NULL != SSLGetContext( sock ) ) {
968 /* Clean up the SSL stack */
969 SSL_shutdown( _ssl_context[sock] );
970 SSL_free( _ssl_context[sock] );
971 _ssl_context[sock] = NULL;
972 SSL_CTX_free(_ctx[sock]);
983 int SockClose(int sock)
984 /* close a socket gracefully */
987 if( NULL != SSLGetContext( sock ) ) {
988 /* Clean up the SSL stack */
989 SSL_shutdown( _ssl_context[sock] );
990 SSL_free( _ssl_context[sock] );
991 _ssl_context[sock] = NULL;
992 SSL_CTX_free(_ctx[sock]);
999 * This hangs in RedHat 6.2 after fetchmail runs for a while a
1000 * FIN_WAIT2 comes up in netstat and fetchmail never returns from
1001 * the recv system call. (Reported from jtnews
1002 * <jtnews@bellatlantic.net>, Wed, 24 May 2000 21:26:02.)
1004 * Half-close the connection first so the other end gets notified.
1006 * This stops sends but allows receives (effectively, it sends a
1008 if (shutdown(sock, 1) == 0) {
1010 /* If there is any data still waiting in the queue, discard it.
1011 * Call recv() until either it returns 0 (meaning we received a FIN)
1012 * or any error occurs. This makes sure all data sent by the other
1013 * side is acknowledged at the TCP level.
1015 if (fm_peek(sock, &ch, 1) > 0)
1016 while (fm_read(sock, &ch, 1) > 0)
1019 #endif /* __UNUSED__ */
1021 /* if there's an error closing at this point, not much we can do */
1022 return(fm_close(sock)); /* this is guarded */
1027 * Workaround Microsoft Winsock recv/WSARecv(..., MSG_PEEK) bug.
1028 * See http://sources.redhat.com/ml/cygwin/2001-08/msg00628.html
1031 static ssize_t cygwin_read(int sock, void *buf, size_t count)
1036 if ((n = read(sock, bp, count)) == -1)
1041 if (outlevel >= O_VERBOSE)
1042 report(stdout, GT_("Cygwin socket read retry\n"));
1043 n2 = read(sock, bp + n, count - n);
1044 if (n2 == -1 || n + n2 != count) {
1045 report(stderr, GT_("Cygwin socket read retry failed!\n"));
1052 #endif /* __CYGWIN__ */
1056 * Use the chargen service to test input buffering directly.
1057 * You may have to uncomment the `chargen' service description in your
1058 * inetd.conf (and then SIGHUP inetd) for this to work. */
1061 int sock = SockOpen("localhost", "chargen", NULL);
1064 while (SockRead(sock, buf, sizeof(buf)-1))
1065 SockWrite(1, buf, strlen(buf));
1070 /* socket.c ends here */