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Diffstat (limited to '')
| -rw-r--r-- | src/lib/tcp.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/src/lib/tcp.c b/src/lib/tcp.c new file mode 100644 index 0000000..355277c --- /dev/null +++ b/src/lib/tcp.c @@ -0,0 +1,172 @@ +/* + * tcp.c TCP-specific functions. + * + * Version: $Id$ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA + * + * Copyright (C) 2009 Dante http://dante.net + */ + +RCSID("$Id$") + +#include <freeradius-devel/libradius.h> + +#ifdef WITH_TCP + +RADIUS_PACKET *fr_tcp_recv(int sockfd, int flags) +{ + RADIUS_PACKET *packet = rad_alloc(NULL, false); + + if (!packet) return NULL; + + packet->sockfd = sockfd; + + if (fr_tcp_read_packet(packet, flags) != 1) { + rad_free(&packet); + return NULL; + } + + return packet; +} + + +/* + * Receives a packet, assuming that the RADIUS_PACKET structure + * has been filled out already. + * + * This ASSUMES that the packet is allocated && fields + * initialized. + * + * This ASSUMES that the socket is marked as O_NONBLOCK, which + * the function above does set, if your system supports it. + * + * Calling this function MAY change sockfd, + * if src_ipaddr.af == AF_UNSPEC. + */ +int fr_tcp_read_packet(RADIUS_PACKET *packet, int flags) +{ + ssize_t len; + + /* + * No data allocated. Read the 4-byte header into + * a temporary buffer. + */ + if (!packet->data) { + int packet_len; + + len = recv(packet->sockfd, packet->vector + packet->data_len, + 4 - packet->data_len, 0); + if (len == 0) return -2; /* clean close */ + +#ifdef ECONNRESET + if ((len < 0) && (errno == ECONNRESET)) { /* forced */ + return -2; + } +#endif + + if (len < 0) { + fr_strerror_printf("Error receiving packet: %s", + fr_syserror(errno)); + return -1; + } + + packet->data_len += len; + if (packet->data_len < 4) { /* want more data */ + return 0; + } + + packet_len = (packet->vector[2] << 8) | packet->vector[3]; + + if (packet_len < RADIUS_HDR_LEN) { + fr_strerror_printf("Discarding packet: Smaller than RFC minimum of 20 bytes"); + return -1; + } + + /* + * If the packet is too big, then the socket is bad. + */ + if (packet_len > MAX_PACKET_LEN) { + fr_strerror_printf("Discarding packet: Larger than RFC limitation of 4096 bytes"); + return -1; + } + + packet->data = talloc_array(packet, uint8_t, packet_len); + if (!packet->data) { + fr_strerror_printf("Out of memory"); + return -1; + } + + packet->data_len = packet_len; + packet->partial = 4; + memcpy(packet->data, packet->vector, 4); + } + + /* + * Try to read more data. + */ + len = recv(packet->sockfd, packet->data + packet->partial, + packet->data_len - packet->partial, 0); + if (len == 0) return -2; /* clean close */ + +#ifdef ECONNRESET + if ((len < 0) && (errno == ECONNRESET)) { /* forced */ + return -2; + } +#endif + + if (len < 0) { + fr_strerror_printf("Error receiving packet: %s", fr_syserror(errno)); + return -1; + } + + packet->partial += len; + + if (packet->partial < packet->data_len) { + return 0; + } + + /* + * See if it's a well-formed RADIUS packet. + */ + if (!rad_packet_ok(packet, flags, NULL)) { + return -1; + } + + /* + * Explicitly set the VP list to empty. + */ + packet->vps = NULL; + + if (fr_debug_lvl) { + char ip_buf[128], buffer[256]; + + if (packet->src_ipaddr.af != AF_UNSPEC) { + inet_ntop(packet->src_ipaddr.af, + &packet->src_ipaddr.ipaddr, + ip_buf, sizeof(ip_buf)); + snprintf(buffer, sizeof(buffer), "host %s port %d", + ip_buf, packet->src_port); + } else { + snprintf(buffer, sizeof(buffer), "socket %d", + packet->sockfd); + } + + } + + return 1; /* done reading the packet */ +} + +#endif /* WITH_TCP */ |