+/* vi: set sw=4 ts=4: */
/* clientpacket.c
*
* Packet generation and dispatching functions for the DHCP client.
*
* Russ Dill <Russ.Dill@asu.edu> July 2001
*
- * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-
-#include <string.h>
-#include <sys/socket.h>
+
#include <features.h>
-#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
+#if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION
#include <netpacket/packet.h>
#include <net/ethernet.h>
#else
#include <linux/if_packet.h>
#include <linux/if_ether.h>
#endif
-#include <stdlib.h>
-#include <time.h>
-#include <unistd.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-
+#include "common.h"
#include "dhcpd.h"
-#include "packet.h"
-#include "options.h"
#include "dhcpc.h"
-#include "debug.h"
+#include "options.h"
/* Create a random xid */
-unsigned long random_xid(void)
+unsigned random_xid(void)
{
- static int initialized;
+ static smallint initialized;
+
if (!initialized) {
- srand(time(0));
- initialized++;
+ srand(monotonic_us());
+ initialized = 1;
}
return rand();
}
/* initialize a packet with the proper defaults */
static void init_packet(struct dhcpMessage *packet, char type)
{
- struct vendor {
- char vendor, length;
- char str[sizeof("udhcp "VERSION)];
- } vendor_id = { DHCP_VENDOR, sizeof("udhcp "VERSION) - 1, "udhcp "VERSION};
-
- init_header(packet, type);
+ udhcp_init_header(packet, type);
memcpy(packet->chaddr, client_config.arp, 6);
- add_option_string(packet->options, client_config.clientid);
+ if (client_config.clientid)
+ add_option_string(packet->options, client_config.clientid);
if (client_config.hostname) add_option_string(packet->options, client_config.hostname);
- add_option_string(packet->options, (unsigned char *) &vendor_id);
+ if (client_config.fqdn) add_option_string(packet->options, client_config.fqdn);
+ add_option_string(packet->options, client_config.vendorclass);
}
-/* Add a paramater request list for stubborn DHCP servers. Pull the data
+/* Add a parameter request list for stubborn DHCP servers. Pull the data
* from the struct in options.c. Don't do bounds checking here because it
* goes towards the head of the packet. */
static void add_requests(struct dhcpMessage *packet)
int i, len = 0;
packet->options[end + OPT_CODE] = DHCP_PARAM_REQ;
- for (i = 0; options[i].code; i++)
- if (options[i].flags & OPTION_REQ)
- packet->options[end + OPT_DATA + len++] = options[i].code;
+ for (i = 0; dhcp_options[i].code; i++)
+ if (dhcp_options[i].flags & OPTION_REQ)
+ packet->options[end + OPT_DATA + len++] = dhcp_options[i].code;
packet->options[end + OPT_LEN] = len;
packet->options[end + OPT_DATA + len] = DHCP_END;
add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
add_requests(&packet);
- LOG(LOG_DEBUG, "Sending discover...");
- return raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
- SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
+ bb_info_msg("Sending discover...");
+ return udhcp_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
+ SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
}
add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
add_simple_option(packet.options, DHCP_SERVER_ID, server);
-
+
add_requests(&packet);
addr.s_addr = requested;
- LOG(LOG_DEBUG, "Sending select for %s...", inet_ntoa(addr));
- return raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
+ bb_info_msg("Sending select for %s...", inet_ntoa(addr));
+ return udhcp_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
}
packet.ciaddr = ciaddr;
add_requests(&packet);
- LOG(LOG_DEBUG, "Sending renew...");
- if (server)
- ret = kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT);
- else ret = raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
+ bb_info_msg("Sending renew...");
+ if (server)
+ ret = udhcp_kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT);
+ else ret = udhcp_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
return ret;
-}
+}
/* Unicasts a DHCP release message */
init_packet(&packet, DHCPRELEASE);
packet.xid = random_xid();
packet.ciaddr = ciaddr;
-
+
add_simple_option(packet.options, DHCP_REQUESTED_IP, ciaddr);
add_simple_option(packet.options, DHCP_SERVER_ID, server);
- LOG(LOG_DEBUG, "Sending release...");
- return kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT);
+ bb_info_msg("Sending release...");
+ return udhcp_kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT);
}
{
int bytes;
struct udp_dhcp_packet packet;
- u_int32_t source, dest;
- u_int16_t check;
+ uint32_t source, dest;
+ uint16_t check;
memset(&packet, 0, sizeof(struct udp_dhcp_packet));
bytes = read(fd, &packet, sizeof(struct udp_dhcp_packet));
if (bytes < 0) {
- DEBUG(LOG_INFO, "couldn't read on raw listening socket -- ignoring");
+ DEBUG("Cannot read on raw listening socket - ignoring");
usleep(500000); /* possible down interface, looping condition */
return -1;
}
-
+
if (bytes < (int) (sizeof(struct iphdr) + sizeof(struct udphdr))) {
- DEBUG(LOG_INFO, "message too short, ignoring");
+ DEBUG("Message too short, ignoring");
return -2;
}
-
+
if (bytes < ntohs(packet.ip.tot_len)) {
- DEBUG(LOG_INFO, "Truncated packet");
+ DEBUG("Truncated packet");
return -2;
}
-
+
/* ignore any extra garbage bytes */
bytes = ntohs(packet.ip.tot_len);
-
+
/* Make sure its the right packet for us, and that it passes sanity checks */
- if (packet.ip.protocol != IPPROTO_UDP || packet.ip.version != IPVERSION ||
- packet.ip.ihl != sizeof(packet.ip) >> 2 || packet.udp.dest != htons(CLIENT_PORT) ||
- bytes > (int) sizeof(struct udp_dhcp_packet) ||
- ntohs(packet.udp.len) != (short) (bytes - sizeof(packet.ip))) {
- DEBUG(LOG_INFO, "unrelated/bogus packet");
- return -2;
+ if (packet.ip.protocol != IPPROTO_UDP || packet.ip.version != IPVERSION
+ || packet.ip.ihl != sizeof(packet.ip) >> 2
+ || packet.udp.dest != htons(CLIENT_PORT)
+ || bytes > (int) sizeof(struct udp_dhcp_packet)
+ || ntohs(packet.udp.len) != (uint16_t)(bytes - sizeof(packet.ip))
+ ) {
+ DEBUG("Unrelated/bogus packet");
+ return -2;
}
/* check IP checksum */
check = packet.ip.check;
packet.ip.check = 0;
- if (check != checksum(&(packet.ip), sizeof(packet.ip))) {
- DEBUG(LOG_INFO, "bad IP header checksum, ignoring");
+ if (check != udhcp_checksum(&(packet.ip), sizeof(packet.ip))) {
+ DEBUG("bad IP header checksum, ignoring");
return -1;
}
-
+
/* verify the UDP checksum by replacing the header with a psuedo header */
source = packet.ip.saddr;
dest = packet.ip.daddr;
packet.ip.saddr = source;
packet.ip.daddr = dest;
packet.ip.tot_len = packet.udp.len; /* cheat on the psuedo-header */
- if (check && check != checksum(&packet, bytes)) {
- DEBUG(LOG_ERR, "packet with bad UDP checksum received, ignoring");
+ if (check && check != udhcp_checksum(&packet, bytes)) {
+ bb_error_msg("packet with bad UDP checksum received, ignoring");
return -2;
}
-
+
memcpy(payload, &(packet.data), bytes - (sizeof(packet.ip) + sizeof(packet.udp)));
-
+
if (ntohl(payload->cookie) != DHCP_MAGIC) {
- LOG(LOG_ERR, "received bogus message (bad magic) -- ignoring");
+ bb_error_msg("received bogus message (bad magic) - ignoring");
return -2;
}
- DEBUG(LOG_INFO, "oooooh!!! got some!");
+ DEBUG("oooooh!!! got some!");
return bytes - (sizeof(packet.ip) + sizeof(packet.udp));
-
-}
+}
projects / oweals / busybox.git / blobdiff