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

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Revision 1.34.2.1 - (show annotations)
Fri Aug 8 00:30:36 2003 UTC (20 years, 7 months ago) by lefcha
Branch: release-0_9-patches
Changes since 1.34: +4 -5 lines
File MIME type: text/plain
Changed PF_INET to AF_INET and corrected header includes.

1 #include <stdio.h>
2 #include <unistd.h>
3 #include <string.h>
4 #include <errno.h>
5 #include <netinet/in.h>
6 #include <netdb.h>
7 #include <sys/socket.h>
8 #include <sys/select.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 #endif
18
19
20 extern unsigned int options;
21 extern conn_t connpri, connaux;
22
23 long timeout = -1; /* Server non-response timeout in seconds. */
24
25
26 /*
27 * Connect to mail server.
28 */
29 int
30 init_connection(conn_t * conn, char *serv, unsigned short int port,
31 unsigned int protocol)
32 {
33 struct sockaddr_in sa;
34 struct hostent *he;
35
36 #ifndef SSL_TLS
37 if (protocol != SSL_DISABLED) {
38 error("SSL not supported by this build\n");
39 return ERROR_SSL;
40 }
41 #endif
42
43 memset((char *)&sa, 0, sizeof(struct sockaddr_in));
44
45 conn->sock = socket(AF_INET, SOCK_STREAM, 0);
46
47 if (conn->sock < 0) {
48 error("create socket; %s\n", strerror(errno));
49 return ERROR_NETWORK;
50 }
51 if (!(he = gethostbyname(serv))) {
52 error("get network host entry of %s; %s\n", serv,
53 strerror(errno));
54 close_connection(conn);
55 return ERROR_NETWORK;
56 }
57 sa.sin_family = AF_INET;
58 sa.sin_port = htons(port);
59 sa.sin_addr = *(struct in_addr *) he->h_addr;
60
61 if (connect(conn->sock, (struct sockaddr *) & sa,
62 sizeof(struct sockaddr))) {
63 error("initiating connection to %s; %s\n", serv,
64 strerror(errno));
65 close_connection(conn);
66 return ERROR_NETWORK;
67 }
68 if (conn == &connpri)
69 info("Connected to %s.\n", he->h_name);
70
71 #ifdef SSL_TLS
72 if (protocol != SSL_DISABLED)
73 if (!init_secure_connection(conn, protocol))
74 return 0;
75 else
76 return ERROR_SSL;
77 else
78 conn->ssl = NULL;
79 #endif
80
81 return 0;
82 }
83
84
85 #ifdef SSL_TLS
86 /*
87 * Initialize Secure Socket Layer connection.
88 */
89 int
90 init_secure_connection(conn_t * conn, unsigned int protocol)
91 {
92 int e;
93 SSL_CTX *ctx;
94 SSL_METHOD *method;
95
96 method = NULL;
97
98 SSL_library_init();
99 SSL_load_error_strings();
100
101 switch (protocol) {
102 case SSL_TLS_V1:
103 method = TLSv1_client_method();
104 break;
105 case SSL_SSL_V2:
106 case SSL_SSL_V3:
107 method = SSLv23_client_method();
108 break;
109 }
110
111 if (!(ctx = SSL_CTX_new(method)))
112 goto fail;
113
114 if (!(conn->ssl = SSL_new(ctx)))
115 goto fail;
116
117 SSL_set_fd(conn->ssl, conn->sock);
118
119 if ((e = SSL_connect(conn->ssl)) <= 0) {
120 SSL_get_error(conn->ssl, e);
121 error("initiating SSL connection; %s\n",
122 ERR_error_string(ERR_get_error(), NULL));
123 goto fail;
124 }
125 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 goto fail;
140
141 SSL_CTX_free(ctx);
142
143 return 0;
144
145 fail:
146 conn->ssl = NULL;
147 SSL_CTX_free(ctx);
148
149 return ERROR_SSL;
150 }
151 #endif /* SSL_TLS */
152
153
154 /*
155 * Disconnect from mail server.
156 */
157 int
158 close_connection(conn_t * conn)
159 {
160 #ifdef SSL_TLS
161 if (conn->ssl) {
162 SSL_shutdown(conn->ssl);
163 SSL_free(conn->ssl);
164 conn->ssl = NULL;
165 }
166 #endif
167 if (conn->sock >= 0 && close(conn->sock) == -1) {
168 error("closing socket; %s\n", strerror(errno));
169 return ERROR_NETWORK;
170 } else {
171 conn->sock = -1;
172 return 0;
173 }
174 }
175
176
177 /*
178 * Read data from socket.
179 */
180 int
181 socket_read(conn_t * conn, char *buf)
182 {
183 int f, e, s;
184 fd_set fds;
185 struct timeval tv;
186 struct timeval *tvp;
187
188 e = 0;
189 s = 1;
190 tvp = NULL;
191
192 memset(buf, 0, RESPONSE_BUF + 1);
193
194 if (timeout >= 0) {
195 tv.tv_sec = timeout;
196 tv.tv_usec = 0;
197 tvp = &tv;
198 }
199 f = fcntl(conn->sock, F_GETFL, 0);
200 fcntl(conn->sock, F_SETFL, f | O_NONBLOCK);
201
202 FD_ZERO(&fds);
203 FD_SET(conn->sock, &fds);
204
205 #ifdef SSL_TLS
206 if (conn->ssl) {
207 while (SSL_pending(conn->ssl) > 0 ||
208 ((s = select(conn->sock + 1, &fds, NULL, NULL, tvp)) > 0 &&
209 FD_ISSET(conn->sock, &fds))) {
210 e = SSL_read(conn->ssl, buf, RESPONSE_BUF);
211
212 if (e > 0)
213 break;
214
215 switch (SSL_get_error(conn->ssl, e)) {
216 case SSL_ERROR_WANT_READ:
217 case SSL_ERROR_WANT_WRITE:
218 continue;
219 case SSL_ERROR_ZERO_RETURN:
220 return ERROR_NETWORK;
221 case SSL_ERROR_SYSCALL:
222 case SSL_ERROR_SSL:
223 fatal(ERROR_NETWORK, "reading data; %s\n",
224 ERR_error_string(ERR_get_error(), NULL));
225 default:
226 fatal(ERROR_NETWORK,
227 "undefined ssl error while reading data\n");
228 }
229 }
230 } else
231 #endif
232 {
233 if ((s = select(conn->sock + 1, &fds, NULL, NULL, tvp)) > 0 &&
234 FD_ISSET(conn->sock, &fds))
235 e = read(conn->sock, buf, RESPONSE_BUF);
236
237 if (e == -1)
238 fatal(ERROR_NETWORK, "reading data; %s",
239 strerror(errno));
240 else if (e == 0)
241 return ERROR_NETWORK;
242 }
243
244 fcntl(conn->sock, F_SETFL, f);
245
246 if (s == -1)
247 fatal(ERROR_NETWORK, "waiting to read from socket; %s\n",
248 strerror(errno));
249 else if (s == 0)
250 fatal(ERROR_NETWORK,
251 "timeout period expired while waiting to read "
252 "data\n");
253
254 return 0;
255 }
256
257
258 /*
259 * Write data to socket.
260 */
261 int
262 socket_write(conn_t * conn, char *data)
263 {
264 int f, e, s;
265 fd_set fds;
266 struct timeval tv;
267 struct timeval *tvp = NULL;
268
269 e = 0;
270 s = 1;
271
272 if (timeout >= 0) {
273 tv.tv_sec = timeout;
274 tv.tv_usec = 0;
275 tvp = &tv;
276 }
277 f = fcntl(conn->sock, F_GETFL, 0);
278 fcntl(conn->sock, F_SETFL, f | O_NONBLOCK);
279
280 FD_ZERO(&fds);
281 FD_SET(conn->sock, &fds);
282
283 #ifdef SSL_TLS
284 if (conn->ssl) {
285 while ((s = select(conn->sock + 1, NULL, &fds, NULL, tvp) > 0 &&
286 FD_ISSET(conn->sock, &fds))) {
287 e = SSL_write(conn->ssl, data, strlen(data));
288
289 if (e > 0)
290 break;
291
292 switch (SSL_get_error(conn->ssl, e)) {
293 case SSL_ERROR_WANT_READ:
294 case SSL_ERROR_WANT_WRITE:
295 continue;
296 case SSL_ERROR_ZERO_RETURN:
297 return ERROR_NETWORK;
298 case SSL_ERROR_SYSCALL:
299 case SSL_ERROR_SSL:
300 fatal(ERROR_NETWORK, "writing data; %s\n",
301 ERR_error_string(ERR_get_error(), NULL));
302 default:
303 fatal(ERROR_NETWORK,
304 "undefined ssl error while writing data\n");
305 }
306 }
307 } else
308 #endif
309 {
310 if ((s = select(conn->sock + 1, NULL, &fds, NULL, tvp)) > 0 &&
311 FD_ISSET(conn->sock, &fds))
312 e = write(conn->sock, data, strlen(data));
313
314 if (e == -1)
315 fatal(ERROR_NETWORK, "writing data; %s",
316 strerror(errno));
317 }
318
319 fcntl(conn->sock, F_SETFL, f);
320
321 if (s == -1)
322 fatal(ERROR_NETWORK, "waiting to write to socket; %s\n",
323 strerror(errno));
324 else if (s == 0)
325 fatal(ERROR_NETWORK,
326 "timeout period expired while waiting to write "
327 "data\n");
328
329 return 0;
330 }

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