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/* this is session.c file, part of the libspopc library sources |
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* copyright © 2002- Benoit Rouits <brouits@free.fr> |
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* released under the terms of the GNU Lesser General Public Licence. |
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* |
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* libspopc offers simple API for a pop3 client. |
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* See RFC 1725 for pop3 specifications. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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/*I casted 'port' to true unsigned, now, tell me if warning continues */ |
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/*; #pragma warning(disable: 4761)*/ /* disable "integral size mismatch in argument" -warning */ |
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|
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#ifdef WIN32 |
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#include <winsock.h> |
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#include <stdio.h> |
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#else |
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#include <netdb.h> |
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#include <unistd.h> |
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#include <netinet/in.h> |
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#include <sys/socket.h> |
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#endif |
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|
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|
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#include <stdlib.h> |
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#include <string.h> /* strdup */ |
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#include <stdio.h> /* perror */ |
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#include <sys/types.h> |
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|
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#include "libspopc.h" |
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#include "mutex.h" |
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|
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#define socklen_t int /* actually true on most systems */ |
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|
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/* needs from queries.c */ |
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extern int pop3_recv (pop3sock_t sock, char* buf, int len); |
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|
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/* mutex locks for this object (must be declared in libspopc.c) */ |
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extern mutex GETHOSTBYNAME; |
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/* end mutex locks */ |
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|
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#ifdef USE_SSL |
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|
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#define SSL_USE_NEVER -1 /* never use SSL even on port 995 */ |
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#define SSL_USE_AUTO 0 /* use SSL only on port 995 (default) */ |
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#define SSL_USE_ALWAYS 1 /* force SSL whatever the port is */ |
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|
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static int SSL_UP = 0; /* prevent SSL_library_init() to be called twice */ |
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static char* SSL_CERT = NULL; /* whole application on-disk certfile */ |
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|
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/* set default behaviour as SSL_USE_AUTO for backward compatibility */ |
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static int SSL_USE = SSL_USE_AUTO; |
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|
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|
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/* let libspopc never use SSL even connecting on port 995 */ |
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DLLIMPORT void pop3_ssl_never(void) |
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{ |
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SSL_USE = SSL_USE_NEVER; |
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} |
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|
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/* let libspopc use SSL when connecting port 995 */ |
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DLLIMPORT void pop3_ssl_auto(void) |
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{ |
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SSL_USE = SSL_USE_AUTO; |
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} |
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|
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/* let libspopc use SSL connecting on any port, even 110 */ |
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DLLIMPORT void pop3_ssl_always(void) |
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{ |
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SSL_USE = SSL_USE_ALWAYS; |
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} |
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|
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/* set the filename of the certificate */ |
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DLLIMPORT void pop3_cert_setup(const char *certfile) |
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{ |
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if (SSL_CERT) free(SSL_CERT); |
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SSL_CERT=NULL; |
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if (certfile) SSL_CERT=strdup(certfile); |
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} |
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|
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/* callback for error reporting on ssl verification |
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* just return 0 on error, 1 else |
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*/ |
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DLLIMPORT int ssl_verify_callback(int ok, X509_STORE_CTX *ctx) { |
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if (!ok) { /* bad identification */ |
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int err; |
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err = X509_STORE_CTX_get_error(ctx); |
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return 0; |
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} |
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return 1; |
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} |
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|
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/* init ssl library and context |
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* depending on port and SSL_USE_* |
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*/ |
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DLLIMPORT pop3sock_t ssl_prepare(const int port){ |
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pop3sock_t sock; |
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|
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sock =(pop3sock_t)malloc(sizeof(pop3sock)); |
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sock->sock=socket(AF_INET,SOCK_STREAM,0); |
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if(-1==sock->sock){ |
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perror("ssl_prepare.socket"); |
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free(sock); |
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return(NULL); |
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} |
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if (( (995 == port) && (SSL_USE == SSL_USE_AUTO)) |
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|| (SSL_USE == SSL_USE_ALWAYS) ) { |
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if (0 == SSL_UP) SSL_UP=SSL_library_init(); |
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|
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if (1 != SSL_UP) { |
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#ifdef WIN32 |
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closesocket(sock->sock); |
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#else |
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close(sock->sock); |
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#endif |
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free(sock); |
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perror("ssl_prepare.SSL_library_init"); |
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return(NULL); |
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} |
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SSL_load_error_strings(); |
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sock->ctx = SSL_CTX_new(SSLv23_client_method()); |
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if (NULL == sock->ctx) { |
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#ifdef WIN32 |
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closesocket(sock->sock); |
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#else |
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close(sock->sock); |
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#endif |
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free(sock); |
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perror("ssl_prepare.SSLv23_client_method"); |
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return(NULL); |
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} |
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SSL_CTX_set_mode(sock->ctx, SSL_MODE_AUTO_RETRY); |
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if ( SSL_CERT != NULL ) { |
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SSL_CTX_load_verify_locations(sock->ctx, SSL_CERT, 0); |
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SSL_CTX_set_verify(sock->ctx, SSL_VERIFY_PEER, &ssl_verify_callback); |
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} |
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sock->ssl = SSL_new(sock->ctx); |
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if (NULL == sock->ssl) { |
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#ifdef WIN32 |
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closesocket(sock->sock); |
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#else |
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close(sock->sock); |
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#endif |
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SSL_CTX_free(sock->ctx); |
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free(sock); |
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perror("ssl_prepare.SSL_new"); |
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return(NULL); |
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} |
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SSL_set_fd(sock->ssl, sock->sock); |
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} else { /* port != 995 or SSL_USE_NEVER */ |
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sock->ssl=NULL; |
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sock->ctx=NULL; |
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} |
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return sock; |
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} |
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|
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#endif |
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|
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/* prepares the socket options |
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* mainly set read an write timeouts |
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* this way may be either ignored |
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* or refused on some platform |
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*/ |
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DLLIMPORT int socket_prepare(int sock, int timeout){ |
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int ret=0; |
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#ifdef WIN32 |
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timeout *= 1000; |
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if (ret += setsockopt (sock, SOL_SOCKET, SO_RCVTIMEO, (void*)&timeout, sizeof timeout)) |
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perror("socket_prepare.setsockopt"); |
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if (ret += setsockopt (sock, SOL_SOCKET, SO_SNDTIMEO, (void*)&timeout, sizeof timeout)) |
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perror("socket_prepare.setsockopt"); |
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#else |
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struct timeval tv; |
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tv.tv_sec = timeout; |
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tv.tv_usec = 0 ; |
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|
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if (ret += setsockopt (sock, SOL_SOCKET, SO_RCVTIMEO, (void*)&tv, sizeof tv)) |
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perror("socket_prepare.setsockopt"); |
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if (ret += setsockopt (sock, SOL_SOCKET, SO_SNDTIMEO, (void*)&tv, sizeof tv)) |
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perror("socket_prepare.setsockopt"); |
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#endif |
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return ret; |
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} |
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|
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/* prepares the pop session and returns a socket descriptor */ |
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DLLIMPORT pop3sock_t pop3_prepare(const char* servername, const int port, struct sockaddr_in* connection, struct hostent* server){ |
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pop3sock_t sock; |
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struct hostent* hostent_buf; |
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int i; |
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#ifdef WIN32 |
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|
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WSADATA wsaData; |
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|
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if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0) |
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{ |
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exit(1); |
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} |
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|
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#endif |
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|
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memset((char*)connection,0,sizeof(struct sockaddr_in)); |
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|
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/* here, enter a critical section to perform atomic name resolution */ |
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mutex_in(&GETHOSTBYNAME); |
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hostent_buf=gethostbyname(servername); |
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if(!hostent_buf){ |
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#ifdef WIN32 |
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perror("pop3_prepare.gethostbyname"); |
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#else |
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herror("pop3_prepare.gethostbyname"); |
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#endif |
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/* we don't want somebody to go out with mutex locked */ |
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mutex_out(&GETHOSTBYNAME); |
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return BAD_SOCK; |
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} |
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/* begin hostent deep copy */ |
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memmove(server,hostent_buf,sizeof(struct hostent)); |
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server->h_name=strdup(hostent_buf->h_name); |
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server->h_aliases=NULL; |
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i=0; |
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while (hostent_buf->h_aliases[i]) |
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{ |
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server->h_aliases=realloc(server->h_aliases,(i+1)*sizeof(char*)); |
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server->h_aliases[i]=strdup(hostent_buf->h_aliases[i]); |
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i++; |
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} |
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if (i>0) { |
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server->h_aliases=realloc(server->h_aliases,(i+1)*sizeof(char*)); |
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server->h_aliases[i]=NULL; |
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} |
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|
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server->h_addr_list=NULL; |
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i=0; |
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while (hostent_buf->h_addr_list[i]) |
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{ /* has at least one adress */ |
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server->h_addr_list=realloc(server->h_addr_list,(i+1)*sizeof(char*)); |
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server->h_addr_list[i]=malloc(server->h_length); |
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memmove(server->h_addr_list[i],hostent_buf->h_addr_list[i],server->h_length); |
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i++; |
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} |
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if (i>0) { |
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server->h_addr_list=realloc(server->h_addr_list, (i+1)*sizeof(char*)); |
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server->h_addr_list[i]=NULL; |
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} |
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|
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/* end hostent deep copy */ |
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mutex_out(&GETHOSTBYNAME); |
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/* end of critical section (name resolution) */ |
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|
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memmove((char*)&(connection->sin_addr.s_addr),server->h_addr,server->h_length); |
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connection->sin_family=AF_INET; |
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connection->sin_port=htons(port?(unsigned short int)port:(unsigned short int)110); |
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/* integral size mismatch in argument - htons(port)*/ |
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|
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#ifdef USE_SSL |
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sock = ssl_prepare(port); |
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#else |
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sock=socket(AF_INET,SOCK_STREAM,0); |
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if(BAD_SOCK == sock){ |
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perror("pop3_prepare.socket"); |
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} |
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#endif |
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#ifdef USE_SSL |
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socket_prepare(sock->sock, SOCKET_TIMEOUT); |
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#else |
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socket_prepare(sock, SOCKET_TIMEOUT); |
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#endif |
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return(sock); |
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} |
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|
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/* connects to the server through the sock and returns server's welcome */ |
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DLLIMPORT char* pop3_connect(pop3sock_t sock, struct sockaddr_in* connection){ |
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int r; |
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char* buf; |
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|
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|
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#ifdef USE_SSL |
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r=connect(sock->sock,(struct sockaddr*)connection,(socklen_t)sizeof(*connection)); |
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if ( r!=-1 && sock->ssl ) { |
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if (SSL_connect(sock->ssl) == -1) { |
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#ifdef WIN32 |
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closesocket(sock->sock); |
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#else |
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close(sock->sock); |
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#endif |
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return(NULL); |
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} |
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if ( SSL_CERT ) { |
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if ( !SSL_get_peer_certificate(sock->ssl) ) { |
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#ifdef WIN32 |
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closesocket(sock->sock); |
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#else |
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close(sock->sock); |
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#endif |
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return(NULL); |
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} |
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} |
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} |
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#else |
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r=connect(sock,(struct sockaddr*)connection,(socklen_t)sizeof(*connection)); |
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#endif |
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|
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if(r==-1){ |
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perror("pop3_connect.connect"); |
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return(NULL); |
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} |
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|
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|
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buf=(char*)malloc(POPBUF); |
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if(!buf){ |
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perror("pop3_connect.malloc"); |
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return(NULL); |
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} |
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r=pop3_recv(sock,buf,POPBUF); /* 512 is enough, as say RFC 1939 */ |
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if(r==0 || r==-1){ |
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/* -1: transport error (timeout?) */ |
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/* 0: server error (busy?) */ |
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perror("pop3_connect.pop3_recv"); |
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free(buf); |
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return(NULL); |
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} |
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buf[r]='\0'; |
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return buf; |
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} |
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|
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DLLIMPORT void pop3_disconnect(pop3sock_t sock, struct hostent* server){ |
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int i; |
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/* close socket */ |
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#ifdef USE_SSL |
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if (sock->sock>0) |
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{ |
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#ifdef WIN32 |
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closesocket(sock->sock); |
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#else |
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shutdown(sock->sock,SHUT_RDWR); |
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close(sock->sock); |
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#endif |
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} |
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if (NULL != sock->ssl) { |
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/* a memory leak has been reported with: SSL_shutdown(sock->ssl);*/ |
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SSL_free(sock->ssl); |
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} |
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if ( NULL != sock->ctx ) { |
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SSL_CTX_free(sock->ctx); |
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} |
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|
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free(sock); |
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#else |
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if (sock>0) { |
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#ifdef WIN32 |
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closesocket(sock); |
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#else |
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shutdown(sock,SHUT_RDWR); |
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close(sock); |
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#endif |
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} |
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#endif |
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/* free deep copy of struct hostent */ |
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if (server->h_addr_list) { |
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i=0; |
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while(NULL != server->h_addr_list[i]) { |
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/* has at least one adress */ |
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free(server->h_addr_list[i]); |
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i++; |
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} |
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free(server->h_addr_list); |
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} |
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if (server->h_aliases) { |
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i=0; |
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while (NULL != server->h_aliases[i]) { |
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free(server->h_aliases[i]); |
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i++; |
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} |
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free(server->h_aliases); |
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} |
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free(server->h_name); |
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#ifdef WIN32 |
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WSACleanup(); |
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#endif |
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} |
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|
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/* sets the timeout in seconds for a socket descriptor */ |
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DLLIMPORT int pop3_timeout(pop3sock_t sock, int timeout){ |
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#ifdef USE_SSL |
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return socket_prepare(sock->sock, timeout); |
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#else |
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return socket_prepare(sock, timeout); |
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#endif |
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} |
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