/[imapfilter]/imapfilter/socket.c
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Annotation of /imapfilter/socket.c

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Revision 1.33 - (hide annotations)
Thu Jul 31 15:53:20 2003 UTC (20 years, 8 months ago) by lefcha
Branch: MAIN
Changes since 1.32: +19 -17 lines
File MIME type: text/plain
Broke up program files and created some new header files.

1 lefcha 1.33 #include <stdio.h>
2 lefcha 1.1 #include <string.h>
3 lefcha 1.33 #include <unistd.h>
4 lefcha 1.1 #include <errno.h>
5     #include <sys/types.h>
6     #include <sys/socket.h>
7     #include <netinet/in.h>
8     #include <netdb.h>
9     #include <fcntl.h>
10    
11     #include "config.h"
12     #include "imapfilter.h"
13    
14     #ifdef SSL_TLS
15     #include <openssl/ssl.h>
16     #include <openssl/err.h>
17 lefcha 1.3 #include <openssl/x509.h>
18 lefcha 1.13 #endif
19    
20 lefcha 1.33
21 lefcha 1.28 extern unsigned int options;
22 lefcha 1.31 extern conn_t connpri, connaux;
23 lefcha 1.1
24 lefcha 1.14 long timeout = -1; /* Server non-response timeout in seconds. */
25 lefcha 1.1
26 lefcha 1.25
27 lefcha 1.1 /*
28     * Connect to mail server.
29     */
30 lefcha 1.26 int
31 lefcha 1.31 init_connection(conn_t * conn, char *serv, unsigned short int port,
32 lefcha 1.26 unsigned int protocol)
33 lefcha 1.1 {
34 lefcha 1.26 struct sockaddr_in sa;
35     struct hostent *he;
36    
37 lefcha 1.32 #ifndef SSL_TLS
38 lefcha 1.26 if (protocol != SSL_DISABLED) {
39     error("SSL not supported by this build\n");
40     return ERROR_SSL;
41     }
42 lefcha 1.32 #endif
43    
44 lefcha 1.26 memset((char *)&sa, 0, sizeof(struct sockaddr_in));
45 lefcha 1.1
46 lefcha 1.31 conn->sock = socket(PF_INET, SOCK_STREAM, 0);
47 lefcha 1.2
48 lefcha 1.31 if (conn->sock < 0) {
49 lefcha 1.26 error("create socket; %s\n", strerror(errno));
50     return ERROR_NETWORK;
51     }
52     if (!(he = gethostbyname(serv))) {
53     error("get network host entry of %s; %s\n", serv,
54     strerror(errno));
55 lefcha 1.31 close_connection(conn);
56 lefcha 1.26 return ERROR_NETWORK;
57     }
58     sa.sin_family = AF_INET;
59     sa.sin_port = htons(port);
60     sa.sin_addr = *(struct in_addr *) he->h_addr;
61    
62 lefcha 1.31 if (connect(conn->sock, (struct sockaddr *) & sa,
63     sizeof(struct sockaddr))) {
64 lefcha 1.26 error("initiating connection to %s; %s\n", serv,
65     strerror(errno));
66 lefcha 1.31 close_connection(conn);
67 lefcha 1.26 return ERROR_NETWORK;
68     }
69 lefcha 1.28 info("Connected to %s.\n", he->h_name);
70    
71 lefcha 1.1 #ifdef SSL_TLS
72 lefcha 1.26 if (protocol != SSL_DISABLED)
73 lefcha 1.33 if (!init_secure_connection(conn, protocol))
74 lefcha 1.26 return 0;
75 lefcha 1.28 else
76 lefcha 1.26 return ERROR_SSL;
77     else
78 lefcha 1.31 conn->ssl = NULL;
79 lefcha 1.1 #endif
80    
81 lefcha 1.26 return 0;
82 lefcha 1.1 }
83    
84    
85     #ifdef SSL_TLS
86     /*
87     * Initialize Secure Socket Layer connection.
88     */
89 lefcha 1.26 int
90 lefcha 1.33 init_secure_connection(conn_t * conn, unsigned int protocol)
91 lefcha 1.1 {
92 lefcha 1.26 int e;
93     SSL_CTX *ctx;
94     SSL_METHOD *method;
95    
96     method = NULL;
97    
98     SSL_library_init();
99 lefcha 1.30 SSL_load_error_strings();
100 lefcha 1.26
101     switch (protocol) {
102 lefcha 1.30 case SSL_TLS_V1:
103     method = TLSv1_client_method();
104     break;
105 lefcha 1.26 case SSL_SSL_V2:
106     case SSL_SSL_V3:
107 lefcha 1.30 method = SSLv23_client_method();
108 lefcha 1.26 break;
109     }
110 lefcha 1.3
111 lefcha 1.26 if (!(ctx = SSL_CTX_new(method)))
112 lefcha 1.30 goto fail;
113 lefcha 1.1
114 lefcha 1.31 if (!(conn->ssl = SSL_new(ctx)))
115 lefcha 1.30 goto fail;
116 lefcha 1.26
117 lefcha 1.31 SSL_set_fd(conn->ssl, conn->sock);
118 lefcha 1.26
119 lefcha 1.31 if ((e = SSL_connect(conn->ssl)) <= 0) {
120     SSL_get_error(conn->ssl, e);
121 lefcha 1.30 error("initiating SSL connection; %s\n",
122 lefcha 1.26 ERR_error_string(ERR_get_error(), NULL));
123 lefcha 1.30 goto fail;
124 lefcha 1.26 }
125 lefcha 1.33 if (options & OPTION_DETAILS_VERBOSE) {
126     SSL_CIPHER *cipher;
127     char *ver;
128     const char *name;
129     int usebits, algbits;
130    
131     cipher = SSL_get_current_cipher(conn->ssl);
132     ver = SSL_CIPHER_get_version(cipher);
133     name = SSL_CIPHER_get_name(cipher);
134     usebits = SSL_CIPHER_get_bits(cipher, &algbits);
135     printf("SSL/TLS handshake completed: %s with cipher %s "
136     "(%d/%d bits).\n", ver, name, usebits, algbits);
137     }
138     if (get_cert(conn))
139 lefcha 1.30 goto fail;
140 lefcha 1.26
141     SSL_CTX_free(ctx);
142    
143     return 0;
144 lefcha 1.30
145     fail:
146 lefcha 1.31 conn->ssl = NULL;
147 lefcha 1.30 SSL_CTX_free(ctx);
148    
149     return ERROR_SSL;
150 lefcha 1.1 }
151 lefcha 1.25 #endif /* SSL_TLS */
152 lefcha 1.1
153    
154     /*
155     * Disconnect from mail server.
156     */
157 lefcha 1.26 int
158 lefcha 1.31 close_connection(conn_t * conn)
159 lefcha 1.1 {
160 lefcha 1.31 if (conn->ssl) {
161     SSL_shutdown(conn->ssl);
162     SSL_free(conn->ssl);
163     conn->ssl = NULL;
164 lefcha 1.26 }
165 lefcha 1.31 if (conn->sock >= 0 && close(conn->sock) == -1) {
166 lefcha 1.26 error("closing socket; %s\n", strerror(errno));
167     return ERROR_NETWORK;
168     } else {
169 lefcha 1.31 conn->sock = -1;
170 lefcha 1.26 return 0;
171     }
172 lefcha 1.1 }
173    
174    
175     /*
176     * Read data from socket.
177     */
178 lefcha 1.26 int
179 lefcha 1.31 socket_read(conn_t * conn, char *buf)
180 lefcha 1.1 {
181 lefcha 1.26 int f, e, s;
182     fd_set fds;
183     struct timeval tv;
184     struct timeval *tvp;
185 lefcha 1.28
186 lefcha 1.26 e = 0;
187     s = 1;
188     tvp = NULL;
189 lefcha 1.1
190 lefcha 1.29 memset(buf, 0, RESPONSE_BUF + 1);
191 lefcha 1.1
192 lefcha 1.26 if (timeout >= 0) {
193     tv.tv_sec = timeout;
194     tv.tv_usec = 0;
195     tvp = &tv;
196     }
197 lefcha 1.31 f = fcntl(conn->sock, F_GETFL, 0);
198     fcntl(conn->sock, F_SETFL, f | O_NONBLOCK);
199 lefcha 1.1
200 lefcha 1.26 FD_ZERO(&fds);
201 lefcha 1.31 FD_SET(conn->sock, &fds);
202 lefcha 1.1
203     #ifdef SSL_TLS
204 lefcha 1.31 if (conn->ssl) {
205     while (SSL_pending(conn->ssl) > 0 ||
206     ((s = select(conn->sock + 1, &fds, NULL, NULL, tvp)) > 0 &&
207     FD_ISSET(conn->sock, &fds))) {
208     e = SSL_read(conn->ssl, buf, RESPONSE_BUF);
209 lefcha 1.26
210     if (e > 0)
211     break;
212    
213 lefcha 1.31 switch (SSL_get_error(conn->ssl, e)) {
214 lefcha 1.26 case SSL_ERROR_WANT_READ:
215     case SSL_ERROR_WANT_WRITE:
216     continue;
217     case SSL_ERROR_ZERO_RETURN:
218     return ERROR_NETWORK;
219     case SSL_ERROR_SYSCALL:
220     case SSL_ERROR_SSL:
221 lefcha 1.30 fatal(ERROR_NETWORK, "reading data; %s\n",
222 lefcha 1.26 ERR_error_string(ERR_get_error(), NULL));
223     default:
224     fatal(ERROR_NETWORK,
225     "undefined ssl error while reading data\n");
226     }
227     }
228     } else
229     #endif
230     {
231 lefcha 1.31 if ((s = select(conn->sock + 1, &fds, NULL, NULL, tvp)) > 0 &&
232     FD_ISSET(conn->sock, &fds))
233     e = read(conn->sock, buf, RESPONSE_BUF);
234 lefcha 1.26
235     if (e == -1)
236     fatal(ERROR_NETWORK, "reading data; %s",
237     strerror(errno));
238     else if (e == 0)
239     return ERROR_NETWORK;
240     }
241 lefcha 1.21
242 lefcha 1.31 fcntl(conn->sock, F_SETFL, f);
243 lefcha 1.21
244 lefcha 1.26 if (s == -1)
245     fatal(ERROR_NETWORK, "waiting to read from socket; %s\n",
246     strerror(errno));
247     else if (s == 0)
248 lefcha 1.21 fatal(ERROR_NETWORK,
249 lefcha 1.26 "timeout period expired while waiting to read "
250     "data\n");
251 lefcha 1.1
252 lefcha 1.26 return 0;
253 lefcha 1.1 }
254    
255    
256     /*
257     * Write data to socket.
258     */
259 lefcha 1.26 int
260 lefcha 1.31 socket_write(conn_t * conn, char *data)
261 lefcha 1.1 {
262 lefcha 1.26 int f, e, s;
263     fd_set fds;
264     struct timeval tv;
265     struct timeval *tvp = NULL;
266 lefcha 1.28
267 lefcha 1.26 e = 0;
268     s = 1;
269 lefcha 1.21
270 lefcha 1.26 if (timeout >= 0) {
271     tv.tv_sec = timeout;
272     tv.tv_usec = 0;
273     tvp = &tv;
274     }
275 lefcha 1.31 f = fcntl(conn->sock, F_GETFL, 0);
276     fcntl(conn->sock, F_SETFL, f | O_NONBLOCK);
277 lefcha 1.21
278 lefcha 1.26 FD_ZERO(&fds);
279 lefcha 1.31 FD_SET(conn->sock, &fds);
280 lefcha 1.1
281 lefcha 1.21 #ifdef SSL_TLS
282 lefcha 1.31 if (conn->ssl) {
283     while ((s = select(conn->sock + 1, NULL, &fds, NULL, tvp) > 0 &&
284     FD_ISSET(conn->sock, &fds))) {
285     e = SSL_write(conn->ssl, data, strlen(data));
286 lefcha 1.26
287     if (e > 0)
288     break;
289    
290 lefcha 1.31 switch (SSL_get_error(conn->ssl, e)) {
291 lefcha 1.26 case SSL_ERROR_WANT_READ:
292     case SSL_ERROR_WANT_WRITE:
293     continue;
294     case SSL_ERROR_ZERO_RETURN:
295     return ERROR_NETWORK;
296     case SSL_ERROR_SYSCALL:
297     case SSL_ERROR_SSL:
298 lefcha 1.30 fatal(ERROR_NETWORK, "writing data; %s\n",
299 lefcha 1.26 ERR_error_string(ERR_get_error(), NULL));
300     default:
301     fatal(ERROR_NETWORK,
302     "undefined ssl error while writing data\n");
303     }
304     }
305     } else
306     #endif
307     {
308 lefcha 1.31 if ((s = select(conn->sock + 1, NULL, &fds, NULL, tvp)) > 0 &&
309     FD_ISSET(conn->sock, &fds))
310     e = write(conn->sock, data, strlen(data));
311 lefcha 1.26
312     if (e == -1)
313     fatal(ERROR_NETWORK, "writing data; %s",
314     strerror(errno));
315     }
316 lefcha 1.21
317 lefcha 1.31 fcntl(conn->sock, F_SETFL, f);
318 lefcha 1.21
319 lefcha 1.26 if (s == -1)
320     fatal(ERROR_NETWORK, "waiting to write to socket; %s\n",
321     strerror(errno));
322     else if (s == 0)
323 lefcha 1.21 fatal(ERROR_NETWORK,
324 lefcha 1.26 "timeout period expired while waiting to write "
325     "data\n");
326 lefcha 1.2
327 lefcha 1.26 return 0;
328 lefcha 1.1 }

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