summaryrefslogtreecommitdiff
path: root/tcp.c
blob: 3b758a940f6a3fc8dc9a0f94fcfb6f5b3d69d21d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
/* Copyright (c) 2007-2009, UNINETT AS
 * Copyright (c) 2012, NORDUnet A/S */
/* See LICENSE for licensing information. */

#include <signal.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#ifdef SYS_SOLARIS9
#include <fcntl.h>
#endif
#include <sys/time.h>
#include <sys/types.h>
#include <sys/select.h>
#include <ctype.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <regex.h>
#include <pthread.h>
#include "radsecproxy.h"
#include "hostport.h"

#ifdef RADPROT_TCP
#include "debug.h"
#include "util.h"
static void setprotoopts(struct commonprotoopts *opts);
static char **getlistenerargs();
void *tcplistener(void *arg);
int tcpconnect(struct server *server, struct timeval *when, int timeout, char * text);
void *tcpclientrd(void *arg);
int clientradputtcp(struct server *server, unsigned char *rad);
void tcpsetsrcres();

static const struct protodefs protodefs = {
    "tcp",
    NULL, /* secretdefault */
    SOCK_STREAM, /* socktype */
    "1812", /* portdefault */
    0, /* retrycountdefault */
    0, /* retrycountmax */
    REQUEST_RETRY_INTERVAL * REQUEST_RETRY_COUNT, /* retryintervaldefault */
    60, /* retryintervalmax */
    DUPLICATE_INTERVAL, /* duplicateintervaldefault */
    setprotoopts, /* setprotoopts */
    getlistenerargs, /* getlistenerargs */
    tcplistener, /* listener */
    tcpconnect, /* connecter */
    tcpclientrd, /* clientconnreader */
    clientradputtcp, /* clientradput */
    NULL, /* addclient */
    NULL, /* addserverextra */
    tcpsetsrcres, /* setsrcres */
    NULL /* initextra */
};

static struct addrinfo *srcres = NULL;
static uint8_t handle;
static struct commonprotoopts *protoopts = NULL;
const struct protodefs *tcpinit(uint8_t h) {
    handle = h;
    return &protodefs;
}

static void setprotoopts(struct commonprotoopts *opts) {
    protoopts = opts;
}

static char **getlistenerargs() {
    return protoopts ? protoopts->listenargs : NULL;
}

void tcpsetsrcres() {
    if (!srcres)
	srcres =
            resolvepassiveaddrinfo(protoopts ? protoopts->sourcearg : NULL,
                                   AF_UNSPEC, NULL, protodefs.socktype);
}

int tcpconnect(struct server *server, struct timeval *when, int timeout, char *text) {
    struct timeval now;
    time_t elapsed;

    debug(DBG_DBG, "tcpconnect: called from %s", text);
    pthread_mutex_lock(&server->lock);
    if (when && memcmp(&server->lastconnecttry, when, sizeof(struct timeval))) {
	/* already reconnected, nothing to do */
	debug(DBG_DBG, "tcpconnect(%s): seems already reconnected", text);
	pthread_mutex_unlock(&server->lock);
	return 1;
    }

    for (;;) {
	gettimeofday(&now, NULL);
	elapsed = now.tv_sec - server->lastconnecttry.tv_sec;
	if (timeout && server->lastconnecttry.tv_sec && elapsed > timeout) {
	    debug(DBG_DBG, "tcpconnect: timeout");
	    if (server->sock >= 0)
		close(server->sock);
	    pthread_mutex_unlock(&server->lock);
	    return 0;
	}
	if (server->connectionok) {
	    server->connectionok = 0;
	    sleep(2);
	} else if (elapsed < 1)
	    sleep(2);
	else if (elapsed < 60) {
	    debug(DBG_INFO, "tcpconnect: sleeping %lds", elapsed);
	    sleep(elapsed);
	} else if (elapsed < 100000) {
	    debug(DBG_INFO, "tcpconnect: sleeping %ds", 60);
	    sleep(60);
	} else
	    server->lastconnecttry.tv_sec = now.tv_sec;  /* no sleep at startup */

	if (server->sock >= 0)
	    close(server->sock);
	if ((server->sock = connecttcphostlist(server->conf->hostports, srcres)) >= 0)
	    break;
    }
    server->connectionok = 1;
    gettimeofday(&server->lastconnecttry, NULL);
    pthread_mutex_unlock(&server->lock);
    return 1;
}

/* timeout in seconds, 0 means no timeout (blocking), returns when num bytes have been read, or timeout */
/* returns 0 on timeout, -1 on error and num if ok */
int tcpreadtimeout(int s, unsigned char *buf, int num, int timeout) {
    int ndesc, cnt, len;
    fd_set readfds, writefds;
    struct timeval timer;

    if (s < 0)
	return -1;
    /* make socket non-blocking? */
    for (len = 0; len < num; len += cnt) {
	FD_ZERO(&readfds);
	FD_SET(s, &readfds);
	writefds = readfds;
	if (timeout) {
	    timer.tv_sec = timeout;
	    timer.tv_usec = 0;
	}
	ndesc = select(s + 1, &readfds, &writefds, NULL, timeout ? &timer : NULL);
	if (ndesc < 1)
	    return ndesc;

	cnt = read(s, buf + len, num - len);
	if (cnt <= 0)
	    return -1;
    }
    return num;
}

/* timeout in seconds, 0 means no timeout (blocking) */
unsigned char *radtcpget(int s, int timeout) {
    int cnt, len;
    unsigned char buf[4], *rad;

    for (;;) {
	cnt = tcpreadtimeout(s, buf, 4, timeout);
	if (cnt < 1) {
	    debug(DBG_DBG, cnt ? "radtcpget: connection lost" : "radtcpget: timeout");
	    return NULL;
	}

	len = RADLEN(buf);
	rad = malloc(len);
	if (!rad) {
	    debug(DBG_ERR, "radtcpget: malloc failed");
	    continue;
	}
	memcpy(rad, buf, 4);

	cnt = tcpreadtimeout(s, rad + 4, len - 4, timeout);
	if (cnt < 1) {
	    debug(DBG_DBG, cnt ? "radtcpget: connection lost" : "radtcpget: timeout");
	    free(rad);
	    return NULL;
	}

	if (len >= 20)
	    break;

	free(rad);
	debug(DBG_WARN, "radtcpget: packet smaller than minimum radius size");
    }

    debug(DBG_DBG, "radtcpget: got %d bytes", len);
    return rad;
}

int clientradputtcp(struct server *server, unsigned char *rad) {
    int cnt;
    size_t len;
    struct clsrvconf *conf = server->conf;

    if (!server->connectionok)
	return 0;
    len = RADLEN(rad);
    if ((cnt = write(server->sock, rad, len)) <= 0) {
	debug(DBG_ERR, "clientradputtcp: write error");
	return 0;
    }
    debug(DBG_DBG, "clientradputtcp: Sent %d bytes, Radius packet of length %d to TCP peer %s", cnt, len, conf->name);
    return 1;
}

void *tcpclientrd(void *arg) {
    struct server *server = (struct server *)arg;
    unsigned char *buf;
    struct timeval lastconnecttry;

    for (;;) {
	/* yes, lastconnecttry is really necessary */
	lastconnecttry = server->lastconnecttry;
	buf = radtcpget(server->sock, 0);
	if (!buf) {
	    tcpconnect(server, &lastconnecttry, 0, "tcpclientrd");
	    continue;
	}

	replyh(server, buf);
    }
    server->clientrdgone = 1;
    return NULL;
}

void *tcpserverwr(void *arg) {
    int cnt;
    struct client *client = (struct client *)arg;
    struct gqueue *replyq;
    struct request *reply;

    debug(DBG_DBG, "tcpserverwr: starting for %s", addr2string(client->addr));
    replyq = client->replyq;
    for (;;) {
	pthread_mutex_lock(&replyq->mutex);
	while (!list_first(replyq->entries)) {
	    if (client->sock >= 0) {
		debug(DBG_DBG, "tcpserverwr: waiting for signal");
		pthread_cond_wait(&replyq->cond, &replyq->mutex);
		debug(DBG_DBG, "tcpserverwr: got signal");
	    }
	    if (client->sock < 0) {
		/* s might have changed while waiting */
		pthread_mutex_unlock(&replyq->mutex);
		debug(DBG_DBG, "tcpserverwr: exiting as requested");
		pthread_exit(NULL);
	    }
	}
	reply = (struct request *)list_shift(replyq->entries);
	pthread_mutex_unlock(&replyq->mutex);
	cnt = write(client->sock, reply->replybuf, RADLEN(reply->replybuf));
	if (cnt > 0)
	    debug(DBG_DBG, "tcpserverwr: sent %d bytes, Radius packet of length %d to %s",
		  cnt, RADLEN(reply->replybuf), addr2string(client->addr));
	else
	    debug(DBG_ERR, "tcpserverwr: write error for %s", addr2string(client->addr));
	freerq(reply);
    }
}

void tcpserverrd(struct client *client) {
    struct request *rq;
    uint8_t *buf;
    pthread_t tcpserverwrth;

    debug(DBG_DBG, "tcpserverrd: starting for %s", addr2string(client->addr));

    if (pthread_create(&tcpserverwrth, NULL, tcpserverwr, (void *)client)) {
	debug(DBG_ERR, "tcpserverrd: pthread_create failed");
	return;
    }

    for (;;) {
	buf = radtcpget(client->sock, 0);
	if (!buf) {
	    debug(DBG_ERR, "tcpserverrd: connection from %s lost", addr2string(client->addr));
	    break;
	}
	debug(DBG_DBG, "tcpserverrd: got Radius message from %s", addr2string(client->addr));
	rq = newrequest();
	if (!rq) {
	    free(buf);
	    continue;
	}
	rq->buf = buf;
	rq->from = client;
	if (!radsrv(rq)) {
	    debug(DBG_ERR, "tcpserverrd: message authentication/validation failed, closing connection from %s", addr2string(client->addr));
	    break;
	}
    }

    /* stop writer by setting s to -1 and give signal in case waiting for data */
    client->sock = -1;
    pthread_mutex_lock(&client->replyq->mutex);
    pthread_cond_signal(&client->replyq->cond);
    pthread_mutex_unlock(&client->replyq->mutex);
    debug(DBG_DBG, "tcpserverrd: waiting for writer to end");
    pthread_join(tcpserverwrth, NULL);
    debug(DBG_DBG, "tcpserverrd: reader for %s exiting", addr2string(client->addr));
}
void *tcpservernew(void *arg) {
    int s;
    struct sockaddr_storage from;
    socklen_t fromlen = sizeof(from);
    struct clsrvconf *conf;
    struct client *client;

    s = *(int *)arg;
    if (getpeername(s, (struct sockaddr *)&from, &fromlen)) {
	debug(DBG_DBG, "tcpservernew: getpeername failed, exiting");
	goto exit;
    }
    debug(DBG_WARN, "tcpservernew: incoming TCP connection from %s", addr2string((struct sockaddr *)&from));

    conf = find_clconf(handle, (struct sockaddr *)&from, NULL);
    if (conf) {
	client = addclient(conf, 1);
	if (client) {
	    client->sock = s;
	    client->addr = addr_copy((struct sockaddr *)&from);
	    tcpserverrd(client);
	    removeclient(client);
	} else
	    debug(DBG_WARN, "tcpservernew: failed to create new client instance");
    } else
	debug(DBG_WARN, "tcpservernew: ignoring request, no matching TCP client");

exit:
    shutdown(s, SHUT_RDWR);
    close(s);
    pthread_exit(NULL);
}

void *tcplistener(void *arg) {
    pthread_t tcpserverth;
    int s, *sp = (int *)arg;
    struct sockaddr_storage from;
    socklen_t fromlen = sizeof(from);

    listen(*sp, 0);

    for (;;) {
	s = accept(*sp, (struct sockaddr *)&from, &fromlen);
	if (s < 0) {
	    debug(DBG_WARN, "accept failed");
	    continue;
	}
	if (pthread_create(&tcpserverth, NULL, tcpservernew, (void *)&s)) {
	    debug(DBG_ERR, "tcplistener: pthread_create failed");
	    shutdown(s, SHUT_RDWR);
	    close(s);
	    continue;
	}
	pthread_detach(tcpserverth);
    }
    free(sp);
    return NULL;
}
#else
const struct protodefs *tcpinit(uint8_t h) {
    return NULL;
}
#endif

/* Local Variables: */
/* c-file-style: "stroustrup" */
/* End: */