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authorMike Frysinger <vapier@gentoo.org>2006-03-23 23:44:29 +0000
committerMike Frysinger <vapier@gentoo.org>2006-03-23 23:44:29 +0000
commit787140df3992ccc3ebdc09f6d2dcb584f580f49f (patch)
tree666fdb071676c676f52bdc204f6df801b17e7196 /networking/udhcp/packet.c
parente0fe93759339a9e043cd0489f5bfabd59b5fcb78 (diff)
downloadbusybox-787140df3992ccc3ebdc09f6d2dcb584f580f49f.tar.gz
remove in place of external link
Diffstat (limited to 'networking/udhcp/packet.c')
-rw-r--r--networking/udhcp/packet.c207
1 files changed, 0 insertions, 207 deletions
diff --git a/networking/udhcp/packet.c b/networking/udhcp/packet.c
deleted file mode 100644
index 32fb8a70f..000000000
--- a/networking/udhcp/packet.c
+++ /dev/null
@@ -1,207 +0,0 @@
-#include <unistd.h>
-#include <string.h>
-#include <netinet/in.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <features.h>
-#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
-#include <netpacket/packet.h>
-#include <net/ethernet.h>
-#else
-#include <asm/types.h>
-#include <linux/if_packet.h>
-#include <linux/if_ether.h>
-#endif
-#include <errno.h>
-
-#include "packet.h"
-#include "dhcpd.h"
-#include "options.h"
-#include "common.h"
-
-
-void init_header(struct dhcpMessage *packet, char type)
-{
- memset(packet, 0, sizeof(struct dhcpMessage));
- switch (type) {
- case DHCPDISCOVER:
- case DHCPREQUEST:
- case DHCPRELEASE:
- case DHCPINFORM:
- packet->op = BOOTREQUEST;
- break;
- case DHCPOFFER:
- case DHCPACK:
- case DHCPNAK:
- packet->op = BOOTREPLY;
- }
- packet->htype = ETH_10MB;
- packet->hlen = ETH_10MB_LEN;
- packet->cookie = htonl(DHCP_MAGIC);
- packet->options[0] = DHCP_END;
- add_simple_option(packet->options, DHCP_MESSAGE_TYPE, type);
-}
-
-
-/* read a packet from socket fd, return -1 on read error, -2 on packet error */
-int get_packet(struct dhcpMessage *packet, int fd)
-{
- static const char broken_vendors[][8] = {
- "MSFT 98",
- ""
- };
- int bytes;
- int i;
- char unsigned *vendor;
-
- memset(packet, 0, sizeof(struct dhcpMessage));
- bytes = read(fd, packet, sizeof(struct dhcpMessage));
- if (bytes < 0) {
- DEBUG(LOG_INFO, "couldn't read on listening socket, ignoring");
- return -1;
- }
-
- if (ntohl(packet->cookie) != DHCP_MAGIC) {
- LOG(LOG_ERR, "received bogus message, ignoring");
- return -2;
- }
- DEBUG(LOG_INFO, "Received a packet");
-
- if (packet->op == BOOTREQUEST && (vendor = get_option(packet, DHCP_VENDOR))) {
- for (i = 0; broken_vendors[i][0]; i++) {
- if (vendor[OPT_LEN - 2] == (uint8_t) strlen(broken_vendors[i]) &&
- !strncmp((char*)vendor, broken_vendors[i], vendor[OPT_LEN - 2])) {
- DEBUG(LOG_INFO, "broken client (%s), forcing broadcast",
- broken_vendors[i]);
- packet->flags |= htons(BROADCAST_FLAG);
- }
- }
- }
-
- return bytes;
-}
-
-
-uint16_t checksum(void *addr, int count)
-{
- /* Compute Internet Checksum for "count" bytes
- * beginning at location "addr".
- */
- register int32_t sum = 0;
- uint16_t *source = (uint16_t *) addr;
-
- while (count > 1) {
- /* This is the inner loop */
- sum += *source++;
- count -= 2;
- }
-
- /* Add left-over byte, if any */
- if (count > 0) {
- /* Make sure that the left-over byte is added correctly both
- * with little and big endian hosts */
- uint16_t tmp = 0;
- *(uint8_t *) (&tmp) = * (uint8_t *) source;
- sum += tmp;
- }
- /* Fold 32-bit sum to 16 bits */
- while (sum >> 16)
- sum = (sum & 0xffff) + (sum >> 16);
-
- return ~sum;
-}
-
-
-/* Construct a ip/udp header for a packet, and specify the source and dest hardware address */
-int raw_packet(struct dhcpMessage *payload, uint32_t source_ip, int source_port,
- uint32_t dest_ip, int dest_port, uint8_t *dest_arp, int ifindex)
-{
- int fd;
- int result;
- struct sockaddr_ll dest;
- struct udp_dhcp_packet packet;
-
- if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
- DEBUG(LOG_ERR, "socket call failed: %m");
- return -1;
- }
-
- memset(&dest, 0, sizeof(dest));
- memset(&packet, 0, sizeof(packet));
-
- dest.sll_family = AF_PACKET;
- dest.sll_protocol = htons(ETH_P_IP);
- dest.sll_ifindex = ifindex;
- dest.sll_halen = 6;
- memcpy(dest.sll_addr, dest_arp, 6);
- if (bind(fd, (struct sockaddr *)&dest, sizeof(struct sockaddr_ll)) < 0) {
- DEBUG(LOG_ERR, "bind call failed: %m");
- close(fd);
- return -1;
- }
-
- packet.ip.protocol = IPPROTO_UDP;
- packet.ip.saddr = source_ip;
- packet.ip.daddr = dest_ip;
- packet.udp.source = htons(source_port);
- packet.udp.dest = htons(dest_port);
- packet.udp.len = htons(sizeof(packet.udp) + sizeof(struct dhcpMessage)); /* cheat on the psuedo-header */
- packet.ip.tot_len = packet.udp.len;
- memcpy(&(packet.data), payload, sizeof(struct dhcpMessage));
- packet.udp.check = checksum(&packet, sizeof(struct udp_dhcp_packet));
-
- packet.ip.tot_len = htons(sizeof(struct udp_dhcp_packet));
- packet.ip.ihl = sizeof(packet.ip) >> 2;
- packet.ip.version = IPVERSION;
- packet.ip.ttl = IPDEFTTL;
- packet.ip.check = checksum(&(packet.ip), sizeof(packet.ip));
-
- result = sendto(fd, &packet, sizeof(struct udp_dhcp_packet), 0, (struct sockaddr *) &dest, sizeof(dest));
- if (result <= 0) {
- DEBUG(LOG_ERR, "write on socket failed: %m");
- }
- close(fd);
- return result;
-}
-
-
-/* Let the kernel do all the work for packet generation */
-int kernel_packet(struct dhcpMessage *payload, uint32_t source_ip, int source_port,
- uint32_t dest_ip, int dest_port)
-{
- int n = 1;
- int fd, result;
- struct sockaddr_in client;
-
- if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
- return -1;
-
- if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) == -1) {
- close(fd);
- return -1;
- }
-
- memset(&client, 0, sizeof(client));
- client.sin_family = AF_INET;
- client.sin_port = htons(source_port);
- client.sin_addr.s_addr = source_ip;
-
- if (bind(fd, (struct sockaddr *)&client, sizeof(struct sockaddr)) == -1) {
- close(fd);
- return -1;
- }
-
- memset(&client, 0, sizeof(client));
- client.sin_family = AF_INET;
- client.sin_port = htons(dest_port);
- client.sin_addr.s_addr = dest_ip;
-
- if (connect(fd, (struct sockaddr *)&client, sizeof(struct sockaddr)) == -1) {
- close(fd);
- return -1;
- }
-
- result = write(fd, payload, sizeof(struct dhcpMessage));
- close(fd);
- return result;
-}