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

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Revision 1.42 - (hide annotations)
Sat Feb 14 19:14:43 2004 UTC (20 years, 1 month ago) by lefcha
Branch: MAIN
CVS Tags: HEAD
Changes since 1.41: +5 -5 lines
File MIME type: text/plain
Indentation.

1 lefcha 1.33 #include <stdio.h>
2 lefcha 1.35 #include <unistd.h>
3 lefcha 1.1 #include <string.h>
4     #include <errno.h>
5     #include <netinet/in.h>
6     #include <netdb.h>
7 lefcha 1.35 #include <sys/socket.h>
8 lefcha 1.41 #include <sys/types.h> /* For POSIX.1-2001 non-conformant systems. */
9     #include <sys/time.h> /* For POSIX.1-2001 non-conformant systems. */
10 lefcha 1.35 #include <sys/select.h>
11 lefcha 1.1 #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 lefcha 1.13 #endif
20    
21 lefcha 1.33
22 lefcha 1.39 extern options_t opts;
23     extern connection_t connpri, connaux;
24 lefcha 1.1
25 lefcha 1.25
26 lefcha 1.1 /*
27     * Connect to mail server.
28     */
29 lefcha 1.26 int
30 lefcha 1.39 init_connection(connection_t * conn, char *serv, unsigned short int port,
31 lefcha 1.26 unsigned int protocol)
32 lefcha 1.1 {
33 lefcha 1.26 struct sockaddr_in sa;
34     struct hostent *he;
35    
36 lefcha 1.32 #ifndef SSL_TLS
37 lefcha 1.26 if (protocol != SSL_DISABLED) {
38     error("SSL not supported by this build\n");
39     return ERROR_SSL;
40     }
41 lefcha 1.32 #endif
42    
43 lefcha 1.26 memset((char *)&sa, 0, sizeof(struct sockaddr_in));
44 lefcha 1.1
45 lefcha 1.35 conn->sock = socket(AF_INET, SOCK_STREAM, 0);
46 lefcha 1.2
47 lefcha 1.31 if (conn->sock < 0) {
48 lefcha 1.26 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 lefcha 1.31 close_connection(conn);
55 lefcha 1.26 return ERROR_NETWORK;
56     }
57     sa.sin_family = AF_INET;
58     sa.sin_port = htons(port);
59 lefcha 1.42 sa.sin_addr = *(struct in_addr *)he->h_addr;
60 lefcha 1.26
61 lefcha 1.42 if (connect(conn->sock, (struct sockaddr *)&sa,
62     sizeof(struct sockaddr))) {
63 lefcha 1.26 error("initiating connection to %s; %s\n", serv,
64     strerror(errno));
65 lefcha 1.31 close_connection(conn);
66 lefcha 1.26 return ERROR_NETWORK;
67     }
68 lefcha 1.34 if (conn == &connpri)
69     info("Connected to %s.\n", he->h_name);
70 lefcha 1.28
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 1.39 init_secure_connection(connection_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 1.38 if (opts.verbosity >= 1) {
126 lefcha 1.33 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 1.39 close_connection(connection_t * conn)
159 lefcha 1.1 {
160 lefcha 1.40
161 lefcha 1.34 #ifdef SSL_TLS
162 lefcha 1.31 if (conn->ssl) {
163     SSL_shutdown(conn->ssl);
164     SSL_free(conn->ssl);
165     conn->ssl = NULL;
166 lefcha 1.26 }
167 lefcha 1.34 #endif
168 lefcha 1.31 if (conn->sock >= 0 && close(conn->sock) == -1) {
169 lefcha 1.26 error("closing socket; %s\n", strerror(errno));
170     return ERROR_NETWORK;
171     } else {
172 lefcha 1.31 conn->sock = -1;
173 lefcha 1.26 return 0;
174     }
175 lefcha 1.1 }
176    
177    
178     /*
179     * Read data from socket.
180     */
181 lefcha 1.26 int
182 lefcha 1.39 socket_read(connection_t * conn, char *buf)
183 lefcha 1.1 {
184 lefcha 1.26 int f, e, s;
185     fd_set fds;
186     struct timeval tv;
187     struct timeval *tvp;
188 lefcha 1.28
189 lefcha 1.26 e = 0;
190     s = 1;
191     tvp = NULL;
192 lefcha 1.1
193 lefcha 1.29 memset(buf, 0, RESPONSE_BUF + 1);
194 lefcha 1.1
195 lefcha 1.38 if (opts.timeout >= 0) {
196     tv.tv_sec = opts.timeout;
197 lefcha 1.26 tv.tv_usec = 0;
198     tvp = &tv;
199     }
200 lefcha 1.31 f = fcntl(conn->sock, F_GETFL, 0);
201     fcntl(conn->sock, F_SETFL, f | O_NONBLOCK);
202 lefcha 1.1
203 lefcha 1.26 FD_ZERO(&fds);
204 lefcha 1.31 FD_SET(conn->sock, &fds);
205 lefcha 1.1
206     #ifdef SSL_TLS
207 lefcha 1.31 if (conn->ssl) {
208     while (SSL_pending(conn->ssl) > 0 ||
209     ((s = select(conn->sock + 1, &fds, NULL, NULL, tvp)) > 0 &&
210 lefcha 1.42 FD_ISSET(conn->sock, &fds))) {
211 lefcha 1.31 e = SSL_read(conn->ssl, buf, RESPONSE_BUF);
212 lefcha 1.26
213     if (e > 0)
214     break;
215    
216 lefcha 1.31 switch (SSL_get_error(conn->ssl, e)) {
217 lefcha 1.26 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 lefcha 1.30 fatal(ERROR_NETWORK, "reading data; %s\n",
225 lefcha 1.26 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 lefcha 1.31 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 lefcha 1.26
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 lefcha 1.21
245 lefcha 1.31 fcntl(conn->sock, F_SETFL, f);
246 lefcha 1.21
247 lefcha 1.26 if (s == -1)
248     fatal(ERROR_NETWORK, "waiting to read from socket; %s\n",
249     strerror(errno));
250     else if (s == 0)
251 lefcha 1.21 fatal(ERROR_NETWORK,
252 lefcha 1.26 "timeout period expired while waiting to read "
253     "data\n");
254 lefcha 1.1
255 lefcha 1.26 return 0;
256 lefcha 1.1 }
257    
258    
259     /*
260     * Write data to socket.
261     */
262 lefcha 1.26 int
263 lefcha 1.39 socket_write(connection_t * conn, char *data)
264 lefcha 1.1 {
265 lefcha 1.26 int f, e, s;
266     fd_set fds;
267     struct timeval tv;
268     struct timeval *tvp = NULL;
269 lefcha 1.28
270 lefcha 1.26 e = 0;
271     s = 1;
272 lefcha 1.21
273 lefcha 1.38 if (opts.timeout >= 0) {
274     tv.tv_sec = opts.timeout;
275 lefcha 1.26 tv.tv_usec = 0;
276     tvp = &tv;
277     }
278 lefcha 1.31 f = fcntl(conn->sock, F_GETFL, 0);
279     fcntl(conn->sock, F_SETFL, f | O_NONBLOCK);
280 lefcha 1.21
281 lefcha 1.26 FD_ZERO(&fds);
282 lefcha 1.31 FD_SET(conn->sock, &fds);
283 lefcha 1.1
284 lefcha 1.21 #ifdef SSL_TLS
285 lefcha 1.31 if (conn->ssl) {
286     while ((s = select(conn->sock + 1, NULL, &fds, NULL, tvp) > 0 &&
287 lefcha 1.42 FD_ISSET(conn->sock, &fds))) {
288 lefcha 1.31 e = SSL_write(conn->ssl, data, strlen(data));
289 lefcha 1.26
290     if (e > 0)
291     break;
292    
293 lefcha 1.31 switch (SSL_get_error(conn->ssl, e)) {
294 lefcha 1.26 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 lefcha 1.30 fatal(ERROR_NETWORK, "writing data; %s\n",
302 lefcha 1.26 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 lefcha 1.31 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 lefcha 1.26
315     if (e == -1)
316     fatal(ERROR_NETWORK, "writing data; %s",
317     strerror(errno));
318     }
319 lefcha 1.21
320 lefcha 1.31 fcntl(conn->sock, F_SETFL, f);
321 lefcha 1.21
322 lefcha 1.26 if (s == -1)
323     fatal(ERROR_NETWORK, "waiting to write to socket; %s\n",
324     strerror(errno));
325     else if (s == 0)
326 lefcha 1.21 fatal(ERROR_NETWORK,
327 lefcha 1.26 "timeout period expired while waiting to write "
328     "data\n");
329 lefcha 1.2
330 lefcha 1.26 return 0;
331 lefcha 1.1 }

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