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/*
* Copyright (C) 2006-2008 Stig Venaas <venaas@uninett.no>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#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 <openssl/ssl.h>
#include "debug.h"
#include "list.h"
#include "util.h"
#include "radsecproxy.h"
#include "tls.h"
/* exactly one of client and server must be non-NULL */
/* return who we received from in *client or *server */
/* return from in sa if not NULL */
unsigned char *radudpget(int s, struct client **client, struct server **server, struct sockaddr_storage *sa) {
int cnt, len;
unsigned char buf[4], *rad = NULL;
struct sockaddr_storage from;
socklen_t fromlen = sizeof(from);
struct clsrvconf *p;
struct list_node *node;
fd_set readfds;
for (;;) {
if (rad) {
free(rad);
rad = NULL;
}
FD_ZERO(&readfds);
FD_SET(s, &readfds);
if (select(s + 1, &readfds, NULL, NULL, NULL) < 1)
continue;
cnt = recvfrom(s, buf, 4, MSG_PEEK | MSG_TRUNC, (struct sockaddr *)&from, &fromlen);
if (cnt == -1) {
debug(DBG_WARN, "radudpget: recv failed");
continue;
}
if (cnt < 20) {
debug(DBG_WARN, "radudpget: length too small");
recv(s, buf, 4, 0);
continue;
}
p = client
? find_clconf(RAD_UDP, (struct sockaddr *)&from, NULL)
: find_srvconf(RAD_UDP, (struct sockaddr *)&from, NULL);
if (!p) {
debug(DBG_WARN, "radudpget: got packet from wrong or unknown UDP peer %s, ignoring", addr2string((struct sockaddr *)&from, fromlen));
recv(s, buf, 4, 0);
continue;
}
len = RADLEN(buf);
if (len < 20) {
debug(DBG_WARN, "radudpget: length too small");
recv(s, buf, 4, 0);
continue;
}
rad = malloc(len);
if (!rad) {
debug(DBG_ERR, "radudpget: malloc failed");
recv(s, buf, 4, 0);
continue;
}
cnt = recv(s, rad, len, MSG_TRUNC);
debug(DBG_DBG, "radudpget: got %d bytes from %s", cnt, addr2string((struct sockaddr *)&from, fromlen));
if (cnt < len) {
debug(DBG_WARN, "radudpget: packet smaller than length field in radius header");
continue;
}
if (cnt > len)
debug(DBG_DBG, "radudpget: packet was padded with %d bytes", cnt - len);
if (client) {
node = list_first(p->clients);
*client = node ? (struct client *)node->data : addclient(p);
if (!*client)
continue;
} else if (server)
*server = p->servers;
break;
}
if (sa)
*sa = from;
return rad;
}
int clientradputudp(struct server *server, unsigned char *rad) {
size_t len;
struct sockaddr_storage sa;
struct sockaddr *sap;
struct clsrvconf *conf = server->conf;
in_port_t *port = NULL;
len = RADLEN(rad);
if (*rad == RAD_Accounting_Request) {
sap = (struct sockaddr *)&sa;
memcpy(sap, conf->addrinfo->ai_addr, conf->addrinfo->ai_addrlen);
} else
sap = conf->addrinfo->ai_addr;
switch (sap->sa_family) {
case AF_INET:
port = &((struct sockaddr_in *)sap)->sin_port;
break;
case AF_INET6:
port = &((struct sockaddr_in6 *)sap)->sin6_port;
break;
default:
return 0;
}
if (*rad == RAD_Accounting_Request)
*port = htons(ntohs(*port) + 1);
if (sendto(server->sock, rad, len, 0, sap, conf->addrinfo->ai_addrlen) >= 0) {
debug(DBG_DBG, "clienradputudp: sent UDP of length %d to %s port %d", len, conf->host, ntohs(*port));
return 1;
}
debug(DBG_WARN, "clientradputudp: send failed");
return 0;
}
void *udpclientrd(void *arg) {
struct server *server;
unsigned char *buf;
int *s = (int *)arg;
for (;;) {
server = NULL;
buf = radudpget(*s, NULL, &server, NULL);
if (!replyh(server, buf))
free(buf);
}
}
void *udpserverrd(void *arg) {
struct request rq;
int *sp = (int *)arg;
for (;;) {
memset(&rq, 0, sizeof(struct request));
rq.buf = radudpget(*sp, &rq.from, NULL, &rq.fromsa);
rq.fromudpsock = *sp;
radsrv(&rq);
}
free(sp);
}
void *udpserverwr(void *arg) {
struct queue *replyq = (struct queue *)arg;
struct reply *reply;
for (;;) {
pthread_mutex_lock(&replyq->mutex);
while (!(reply = (struct reply *)list_shift(replyq->entries))) {
debug(DBG_DBG, "udp server writer, waiting for signal");
pthread_cond_wait(&replyq->cond, &replyq->mutex);
debug(DBG_DBG, "udp server writer, got signal");
}
pthread_mutex_unlock(&replyq->mutex);
if (sendto(reply->toudpsock, reply->buf, RADLEN(reply->buf), 0,
(struct sockaddr *)&reply->tosa, SOCKADDR_SIZE(reply->tosa)) < 0)
debug(DBG_WARN, "sendudp: send failed");
free(reply->buf);
free(reply);
}
}
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