1 |
lefcha |
1.1 |
#include <string.h> |
2 |
|
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#include <errno.h> |
3 |
|
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#include <unistd.h> |
4 |
lefcha |
1.10 |
#include <sys/time.h> |
5 |
lefcha |
1.1 |
#include <sys/types.h> |
6 |
|
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#include <sys/socket.h> |
7 |
|
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#include <netinet/in.h> |
8 |
|
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#include <netdb.h> |
9 |
|
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#include <fcntl.h> |
10 |
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|
11 |
|
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#include "config.h" |
12 |
|
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#include "imapfilter.h" |
13 |
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|
14 |
|
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#ifdef SSL_TLS |
15 |
|
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#include <openssl/ssl.h> |
16 |
|
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#include <openssl/err.h> |
17 |
lefcha |
1.3 |
#include <openssl/x509.h> |
18 |
lefcha |
1.13 |
#endif |
19 |
|
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|
20 |
lefcha |
1.28 |
extern unsigned int options; |
21 |
lefcha |
1.31 |
extern conn_t connpri, connaux; |
22 |
lefcha |
1.1 |
|
23 |
lefcha |
1.14 |
long timeout = -1; /* Server non-response timeout in seconds. */ |
24 |
lefcha |
1.1 |
|
25 |
lefcha |
1.25 |
|
26 |
lefcha |
1.1 |
/* |
27 |
|
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* Connect to mail server. |
28 |
|
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*/ |
29 |
lefcha |
1.26 |
int |
30 |
lefcha |
1.31 |
init_connection(conn_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 |
|
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struct hostent *he; |
35 |
|
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|
36 |
lefcha |
1.32 |
#ifndef SSL_TLS |
37 |
lefcha |
1.26 |
if (protocol != SSL_DISABLED) { |
38 |
|
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error("SSL not supported by this build\n"); |
39 |
|
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return ERROR_SSL; |
40 |
|
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} |
41 |
lefcha |
1.32 |
#endif |
42 |
|
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|
43 |
lefcha |
1.26 |
memset((char *)&sa, 0, sizeof(struct sockaddr_in)); |
44 |
lefcha |
1.1 |
|
45 |
lefcha |
1.31 |
conn->sock = socket(PF_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 |
|
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return ERROR_NETWORK; |
50 |
|
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} |
51 |
|
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if (!(he = gethostbyname(serv))) { |
52 |
|
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error("get network host entry of %s; %s\n", serv, |
53 |
|
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strerror(errno)); |
54 |
lefcha |
1.31 |
close_connection(conn); |
55 |
lefcha |
1.26 |
return ERROR_NETWORK; |
56 |
|
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} |
57 |
|
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sa.sin_family = AF_INET; |
58 |
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sa.sin_port = htons(port); |
59 |
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sa.sin_addr = *(struct in_addr *) he->h_addr; |
60 |
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|
61 |
lefcha |
1.31 |
if (connect(conn->sock, (struct sockaddr *) & sa, |
62 |
|
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sizeof(struct sockaddr))) { |
63 |
lefcha |
1.26 |
error("initiating connection to %s; %s\n", serv, |
64 |
|
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strerror(errno)); |
65 |
lefcha |
1.31 |
close_connection(conn); |
66 |
lefcha |
1.26 |
return ERROR_NETWORK; |
67 |
|
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} |
68 |
lefcha |
1.28 |
info("Connected to %s.\n", he->h_name); |
69 |
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|
70 |
lefcha |
1.1 |
#ifdef SSL_TLS |
71 |
lefcha |
1.26 |
if (protocol != SSL_DISABLED) |
72 |
lefcha |
1.31 |
if (!imf_ssl_init(conn, protocol)) |
73 |
lefcha |
1.26 |
return 0; |
74 |
lefcha |
1.28 |
else |
75 |
lefcha |
1.26 |
return ERROR_SSL; |
76 |
|
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else |
77 |
lefcha |
1.31 |
conn->ssl = NULL; |
78 |
lefcha |
1.1 |
#endif |
79 |
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|
80 |
lefcha |
1.26 |
return 0; |
81 |
lefcha |
1.1 |
} |
82 |
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|
83 |
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|
84 |
|
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#ifdef SSL_TLS |
85 |
|
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/* |
86 |
|
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* Initialize Secure Socket Layer connection. |
87 |
|
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*/ |
88 |
lefcha |
1.26 |
int |
89 |
lefcha |
1.31 |
imf_ssl_init(conn_t * conn, unsigned int protocol) |
90 |
lefcha |
1.1 |
{ |
91 |
lefcha |
1.26 |
int e; |
92 |
|
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SSL_CTX *ctx; |
93 |
|
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SSL_METHOD *method; |
94 |
lefcha |
1.30 |
SSL_CIPHER *cipher; |
95 |
|
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char *ver; |
96 |
|
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const char *name; |
97 |
|
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int usebits, algbits; |
98 |
lefcha |
1.26 |
|
99 |
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method = NULL; |
100 |
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|
101 |
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SSL_library_init(); |
102 |
lefcha |
1.30 |
SSL_load_error_strings(); |
103 |
lefcha |
1.26 |
|
104 |
|
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switch (protocol) { |
105 |
lefcha |
1.30 |
case SSL_TLS_V1: |
106 |
|
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method = TLSv1_client_method(); |
107 |
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break; |
108 |
lefcha |
1.26 |
case SSL_SSL_V2: |
109 |
|
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case SSL_SSL_V3: |
110 |
lefcha |
1.30 |
method = SSLv23_client_method(); |
111 |
lefcha |
1.26 |
break; |
112 |
|
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} |
113 |
lefcha |
1.3 |
|
114 |
lefcha |
1.26 |
if (!(ctx = SSL_CTX_new(method))) |
115 |
lefcha |
1.30 |
goto fail; |
116 |
lefcha |
1.1 |
|
117 |
lefcha |
1.31 |
if (!(conn->ssl = SSL_new(ctx))) |
118 |
lefcha |
1.30 |
goto fail; |
119 |
lefcha |
1.26 |
|
120 |
lefcha |
1.31 |
SSL_set_fd(conn->ssl, conn->sock); |
121 |
lefcha |
1.26 |
|
122 |
lefcha |
1.31 |
if ((e = SSL_connect(conn->ssl)) <= 0) { |
123 |
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SSL_get_error(conn->ssl, e); |
124 |
lefcha |
1.30 |
error("initiating SSL connection; %s\n", |
125 |
lefcha |
1.26 |
ERR_error_string(ERR_get_error(), NULL)); |
126 |
lefcha |
1.30 |
goto fail; |
127 |
lefcha |
1.26 |
} |
128 |
lefcha |
1.31 |
cipher = SSL_get_current_cipher(conn->ssl); |
129 |
lefcha |
1.30 |
ver = SSL_CIPHER_get_version(cipher); |
130 |
|
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name = SSL_CIPHER_get_name(cipher); |
131 |
|
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usebits = SSL_CIPHER_get_bits(cipher, &algbits); |
132 |
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verbose("SSL/TLS handshake completed: %s with cipher %s (%d/%d bits).\n", |
133 |
|
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ver, name, usebits, algbits); |
134 |
lefcha |
1.26 |
|
135 |
lefcha |
1.31 |
if (imf_ssl_cert(conn)) |
136 |
lefcha |
1.30 |
goto fail; |
137 |
lefcha |
1.26 |
|
138 |
|
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SSL_CTX_free(ctx); |
139 |
|
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|
140 |
|
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return 0; |
141 |
lefcha |
1.30 |
|
142 |
|
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fail: |
143 |
lefcha |
1.31 |
conn->ssl = NULL; |
144 |
lefcha |
1.30 |
SSL_CTX_free(ctx); |
145 |
|
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|
146 |
|
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return ERROR_SSL; |
147 |
lefcha |
1.1 |
} |
148 |
lefcha |
1.19 |
|
149 |
lefcha |
1.25 |
#endif /* SSL_TLS */ |
150 |
lefcha |
1.1 |
|
151 |
|
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|
152 |
|
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/* |
153 |
|
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* Disconnect from mail server. |
154 |
|
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*/ |
155 |
lefcha |
1.26 |
int |
156 |
lefcha |
1.31 |
close_connection(conn_t * conn) |
157 |
lefcha |
1.1 |
{ |
158 |
lefcha |
1.31 |
if (conn->ssl) { |
159 |
|
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SSL_shutdown(conn->ssl); |
160 |
|
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SSL_free(conn->ssl); |
161 |
|
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conn->ssl = NULL; |
162 |
lefcha |
1.26 |
} |
163 |
lefcha |
1.31 |
if (conn->sock >= 0 && close(conn->sock) == -1) { |
164 |
lefcha |
1.26 |
error("closing socket; %s\n", strerror(errno)); |
165 |
|
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return ERROR_NETWORK; |
166 |
|
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} else { |
167 |
lefcha |
1.31 |
conn->sock = -1; |
168 |
lefcha |
1.26 |
return 0; |
169 |
|
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} |
170 |
lefcha |
1.1 |
} |
171 |
|
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|
172 |
|
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|
173 |
|
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/* |
174 |
|
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* Read data from socket. |
175 |
|
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*/ |
176 |
lefcha |
1.26 |
int |
177 |
lefcha |
1.31 |
socket_read(conn_t * conn, char *buf) |
178 |
lefcha |
1.1 |
{ |
179 |
lefcha |
1.26 |
int f, e, s; |
180 |
|
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fd_set fds; |
181 |
|
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struct timeval tv; |
182 |
|
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struct timeval *tvp; |
183 |
lefcha |
1.28 |
|
184 |
lefcha |
1.26 |
e = 0; |
185 |
|
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s = 1; |
186 |
|
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tvp = NULL; |
187 |
lefcha |
1.1 |
|
188 |
lefcha |
1.29 |
memset(buf, 0, RESPONSE_BUF + 1); |
189 |
lefcha |
1.1 |
|
190 |
lefcha |
1.26 |
if (timeout >= 0) { |
191 |
|
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tv.tv_sec = timeout; |
192 |
|
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tv.tv_usec = 0; |
193 |
|
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tvp = &tv; |
194 |
|
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} |
195 |
lefcha |
1.31 |
f = fcntl(conn->sock, F_GETFL, 0); |
196 |
|
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fcntl(conn->sock, F_SETFL, f | O_NONBLOCK); |
197 |
lefcha |
1.1 |
|
198 |
lefcha |
1.26 |
FD_ZERO(&fds); |
199 |
lefcha |
1.31 |
FD_SET(conn->sock, &fds); |
200 |
lefcha |
1.1 |
|
201 |
|
|
#ifdef SSL_TLS |
202 |
lefcha |
1.31 |
if (conn->ssl) { |
203 |
|
|
while (SSL_pending(conn->ssl) > 0 || |
204 |
|
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((s = select(conn->sock + 1, &fds, NULL, NULL, tvp)) > 0 && |
205 |
|
|
FD_ISSET(conn->sock, &fds))) { |
206 |
|
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e = SSL_read(conn->ssl, buf, RESPONSE_BUF); |
207 |
lefcha |
1.26 |
|
208 |
|
|
if (e > 0) |
209 |
|
|
break; |
210 |
|
|
|
211 |
lefcha |
1.31 |
switch (SSL_get_error(conn->ssl, e)) { |
212 |
lefcha |
1.26 |
case SSL_ERROR_WANT_READ: |
213 |
|
|
case SSL_ERROR_WANT_WRITE: |
214 |
|
|
continue; |
215 |
|
|
case SSL_ERROR_ZERO_RETURN: |
216 |
|
|
return ERROR_NETWORK; |
217 |
|
|
case SSL_ERROR_SYSCALL: |
218 |
|
|
case SSL_ERROR_SSL: |
219 |
lefcha |
1.30 |
fatal(ERROR_NETWORK, "reading data; %s\n", |
220 |
lefcha |
1.26 |
ERR_error_string(ERR_get_error(), NULL)); |
221 |
|
|
default: |
222 |
|
|
fatal(ERROR_NETWORK, |
223 |
|
|
"undefined ssl error while reading data\n"); |
224 |
|
|
} |
225 |
|
|
} |
226 |
|
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} else |
227 |
|
|
#endif |
228 |
|
|
{ |
229 |
lefcha |
1.31 |
if ((s = select(conn->sock + 1, &fds, NULL, NULL, tvp)) > 0 && |
230 |
|
|
FD_ISSET(conn->sock, &fds)) |
231 |
|
|
e = read(conn->sock, buf, RESPONSE_BUF); |
232 |
lefcha |
1.26 |
|
233 |
|
|
if (e == -1) |
234 |
|
|
fatal(ERROR_NETWORK, "reading data; %s", |
235 |
|
|
strerror(errno)); |
236 |
|
|
else if (e == 0) |
237 |
|
|
return ERROR_NETWORK; |
238 |
|
|
} |
239 |
lefcha |
1.21 |
|
240 |
lefcha |
1.31 |
fcntl(conn->sock, F_SETFL, f); |
241 |
lefcha |
1.21 |
|
242 |
lefcha |
1.26 |
if (s == -1) |
243 |
|
|
fatal(ERROR_NETWORK, "waiting to read from socket; %s\n", |
244 |
|
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strerror(errno)); |
245 |
|
|
else if (s == 0) |
246 |
lefcha |
1.21 |
fatal(ERROR_NETWORK, |
247 |
lefcha |
1.26 |
"timeout period expired while waiting to read " |
248 |
|
|
"data\n"); |
249 |
lefcha |
1.1 |
|
250 |
lefcha |
1.26 |
return 0; |
251 |
lefcha |
1.1 |
} |
252 |
|
|
|
253 |
|
|
|
254 |
|
|
/* |
255 |
|
|
* Write data to socket. |
256 |
|
|
*/ |
257 |
lefcha |
1.26 |
int |
258 |
lefcha |
1.31 |
socket_write(conn_t * conn, char *data) |
259 |
lefcha |
1.1 |
{ |
260 |
lefcha |
1.26 |
int f, e, s; |
261 |
|
|
fd_set fds; |
262 |
|
|
struct timeval tv; |
263 |
|
|
struct timeval *tvp = NULL; |
264 |
lefcha |
1.28 |
|
265 |
lefcha |
1.26 |
e = 0; |
266 |
|
|
s = 1; |
267 |
lefcha |
1.21 |
|
268 |
lefcha |
1.26 |
if (timeout >= 0) { |
269 |
|
|
tv.tv_sec = timeout; |
270 |
|
|
tv.tv_usec = 0; |
271 |
|
|
tvp = &tv; |
272 |
|
|
} |
273 |
lefcha |
1.31 |
f = fcntl(conn->sock, F_GETFL, 0); |
274 |
|
|
fcntl(conn->sock, F_SETFL, f | O_NONBLOCK); |
275 |
lefcha |
1.21 |
|
276 |
lefcha |
1.26 |
FD_ZERO(&fds); |
277 |
lefcha |
1.31 |
FD_SET(conn->sock, &fds); |
278 |
lefcha |
1.1 |
|
279 |
lefcha |
1.21 |
#ifdef SSL_TLS |
280 |
lefcha |
1.31 |
if (conn->ssl) { |
281 |
|
|
while ((s = select(conn->sock + 1, NULL, &fds, NULL, tvp) > 0 && |
282 |
|
|
FD_ISSET(conn->sock, &fds))) { |
283 |
|
|
e = SSL_write(conn->ssl, data, strlen(data)); |
284 |
lefcha |
1.26 |
|
285 |
|
|
if (e > 0) |
286 |
|
|
break; |
287 |
|
|
|
288 |
lefcha |
1.31 |
switch (SSL_get_error(conn->ssl, e)) { |
289 |
lefcha |
1.26 |
case SSL_ERROR_WANT_READ: |
290 |
|
|
case SSL_ERROR_WANT_WRITE: |
291 |
|
|
continue; |
292 |
|
|
case SSL_ERROR_ZERO_RETURN: |
293 |
|
|
return ERROR_NETWORK; |
294 |
|
|
case SSL_ERROR_SYSCALL: |
295 |
|
|
case SSL_ERROR_SSL: |
296 |
lefcha |
1.30 |
fatal(ERROR_NETWORK, "writing data; %s\n", |
297 |
lefcha |
1.26 |
ERR_error_string(ERR_get_error(), NULL)); |
298 |
|
|
default: |
299 |
|
|
fatal(ERROR_NETWORK, |
300 |
|
|
"undefined ssl error while writing data\n"); |
301 |
|
|
} |
302 |
|
|
} |
303 |
|
|
} else |
304 |
|
|
#endif |
305 |
|
|
{ |
306 |
lefcha |
1.31 |
if ((s = select(conn->sock + 1, NULL, &fds, NULL, tvp)) > 0 && |
307 |
|
|
FD_ISSET(conn->sock, &fds)) |
308 |
|
|
e = write(conn->sock, data, strlen(data)); |
309 |
lefcha |
1.26 |
|
310 |
|
|
if (e == -1) |
311 |
|
|
fatal(ERROR_NETWORK, "writing data; %s", |
312 |
|
|
strerror(errno)); |
313 |
|
|
} |
314 |
lefcha |
1.21 |
|
315 |
lefcha |
1.31 |
fcntl(conn->sock, F_SETFL, f); |
316 |
lefcha |
1.21 |
|
317 |
lefcha |
1.26 |
if (s == -1) |
318 |
|
|
fatal(ERROR_NETWORK, "waiting to write to socket; %s\n", |
319 |
|
|
strerror(errno)); |
320 |
|
|
else if (s == 0) |
321 |
lefcha |
1.21 |
fatal(ERROR_NETWORK, |
322 |
lefcha |
1.26 |
"timeout period expired while waiting to write " |
323 |
|
|
"data\n"); |
324 |
lefcha |
1.2 |
|
325 |
lefcha |
1.26 |
return 0; |
326 |
lefcha |
1.1 |
} |