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

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Revision 1.42 - (show annotations)
Sat Feb 14 19:14:43 2004 UTC (16 years, 8 months ago) by lefcha
Branch: MAIN
CVS Tags: HEAD
Changes since 1.41: +5 -5 lines
File MIME type: text/plain
Indentation.

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/types.h> /* For POSIX.1-2001 non-conformant systems. */
9 #include <sys/time.h> /* For POSIX.1-2001 non-conformant systems. */
10 #include <sys/select.h>
11 #include <fcntl.h>
12
13 #include "config.h"
14 #include "imapfilter.h"
15
16 #ifdef SSL_TLS
17 #include <openssl/ssl.h>
18 #include <openssl/err.h>
19 #endif
20
21
22 extern options_t opts;
23 extern connection_t connpri, connaux;
24
25
26 /*
27 * Connect to mail server.
28 */
29 int
30 init_connection(connection_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(connection_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 (opts.verbosity >= 1) {
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(connection_t * conn)
159 {
160
161 #ifdef SSL_TLS
162 if (conn->ssl) {
163 SSL_shutdown(conn->ssl);
164 SSL_free(conn->ssl);
165 conn->ssl = NULL;
166 }
167 #endif
168 if (conn->sock >= 0 && close(conn->sock) == -1) {
169 error("closing socket; %s\n", strerror(errno));
170 return ERROR_NETWORK;
171 } else {
172 conn->sock = -1;
173 return 0;
174 }
175 }
176
177
178 /*
179 * Read data from socket.
180 */
181 int
182 socket_read(connection_t * conn, char *buf)
183 {
184 int f, e, s;
185 fd_set fds;
186 struct timeval tv;
187 struct timeval *tvp;
188
189 e = 0;
190 s = 1;
191 tvp = NULL;
192
193 memset(buf, 0, RESPONSE_BUF + 1);
194
195 if (opts.timeout >= 0) {
196 tv.tv_sec = opts.timeout;
197 tv.tv_usec = 0;
198 tvp = &tv;
199 }
200 f = fcntl(conn->sock, F_GETFL, 0);
201 fcntl(conn->sock, F_SETFL, f | O_NONBLOCK);
202
203 FD_ZERO(&fds);
204 FD_SET(conn->sock, &fds);
205
206 #ifdef SSL_TLS
207 if (conn->ssl) {
208 while (SSL_pending(conn->ssl) > 0 ||
209 ((s = select(conn->sock + 1, &fds, NULL, NULL, tvp)) > 0 &&
210 FD_ISSET(conn->sock, &fds))) {
211 e = SSL_read(conn->ssl, buf, RESPONSE_BUF);
212
213 if (e > 0)
214 break;
215
216 switch (SSL_get_error(conn->ssl, e)) {
217 case SSL_ERROR_WANT_READ:
218 case SSL_ERROR_WANT_WRITE:
219 continue;
220 case SSL_ERROR_ZERO_RETURN:
221 return ERROR_NETWORK;
222 case SSL_ERROR_SYSCALL:
223 case SSL_ERROR_SSL:
224 fatal(ERROR_NETWORK, "reading data; %s\n",
225 ERR_error_string(ERR_get_error(), NULL));
226 default:
227 fatal(ERROR_NETWORK,
228 "undefined ssl error while reading data\n");
229 }
230 }
231 } else
232 #endif
233 {
234 if ((s = select(conn->sock + 1, &fds, NULL, NULL, tvp)) > 0 &&
235 FD_ISSET(conn->sock, &fds))
236 e = read(conn->sock, buf, RESPONSE_BUF);
237
238 if (e == -1)
239 fatal(ERROR_NETWORK, "reading data; %s",
240 strerror(errno));
241 else if (e == 0)
242 return ERROR_NETWORK;
243 }
244
245 fcntl(conn->sock, F_SETFL, f);
246
247 if (s == -1)
248 fatal(ERROR_NETWORK, "waiting to read from socket; %s\n",
249 strerror(errno));
250 else if (s == 0)
251 fatal(ERROR_NETWORK,
252 "timeout period expired while waiting to read "
253 "data\n");
254
255 return 0;
256 }
257
258
259 /*
260 * Write data to socket.
261 */
262 int
263 socket_write(connection_t * conn, char *data)
264 {
265 int f, e, s;
266 fd_set fds;
267 struct timeval tv;
268 struct timeval *tvp = NULL;
269
270 e = 0;
271 s = 1;
272
273 if (opts.timeout >= 0) {
274 tv.tv_sec = opts.timeout;
275 tv.tv_usec = 0;
276 tvp = &tv;
277 }
278 f = fcntl(conn->sock, F_GETFL, 0);
279 fcntl(conn->sock, F_SETFL, f | O_NONBLOCK);
280
281 FD_ZERO(&fds);
282 FD_SET(conn->sock, &fds);
283
284 #ifdef SSL_TLS
285 if (conn->ssl) {
286 while ((s = select(conn->sock + 1, NULL, &fds, NULL, tvp) > 0 &&
287 FD_ISSET(conn->sock, &fds))) {
288 e = SSL_write(conn->ssl, data, strlen(data));
289
290 if (e > 0)
291 break;
292
293 switch (SSL_get_error(conn->ssl, e)) {
294 case SSL_ERROR_WANT_READ:
295 case SSL_ERROR_WANT_WRITE:
296 continue;
297 case SSL_ERROR_ZERO_RETURN:
298 return ERROR_NETWORK;
299 case SSL_ERROR_SYSCALL:
300 case SSL_ERROR_SSL:
301 fatal(ERROR_NETWORK, "writing data; %s\n",
302 ERR_error_string(ERR_get_error(), NULL));
303 default:
304 fatal(ERROR_NETWORK,
305 "undefined ssl error while writing data\n");
306 }
307 }
308 } else
309 #endif
310 {
311 if ((s = select(conn->sock + 1, NULL, &fds, NULL, tvp)) > 0 &&
312 FD_ISSET(conn->sock, &fds))
313 e = write(conn->sock, data, strlen(data));
314
315 if (e == -1)
316 fatal(ERROR_NETWORK, "writing data; %s",
317 strerror(errno));
318 }
319
320 fcntl(conn->sock, F_SETFL, f);
321
322 if (s == -1)
323 fatal(ERROR_NETWORK, "waiting to write to socket; %s\n",
324 strerror(errno));
325 else if (s == 0)
326 fatal(ERROR_NETWORK,
327 "timeout period expired while waiting to write "
328 "data\n");
329
330 return 0;
331 }

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