From 5e1a84ab74d5e97582427f016f291a8c11e66f99 Mon Sep 17 00:00:00 2001 From: jutteau Date: Fri, 11 May 2007 18:10:19 +0000 Subject: Completion du script de mise à jour de la pc-104 : * Ajout des sources de busybox dans ./conf/busybox/ * Ajout d'un fichier réclamé par les script dans ./conf/busybox.links --- .../initrd/conf/busybox/networking/udhcp/packet.c | 211 +++++++++++++++++++++ 1 file changed, 211 insertions(+) create mode 100644 i/pc104/initrd/conf/busybox/networking/udhcp/packet.c (limited to 'i/pc104/initrd/conf/busybox/networking/udhcp/packet.c') diff --git a/i/pc104/initrd/conf/busybox/networking/udhcp/packet.c b/i/pc104/initrd/conf/busybox/networking/udhcp/packet.c new file mode 100644 index 0000000..25c55fa --- /dev/null +++ b/i/pc104/initrd/conf/busybox/networking/udhcp/packet.c @@ -0,0 +1,211 @@ +/* vi: set sw=4 ts=4: */ + +#include +#if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION +#include +#include +#else +#include +#include +#include +#endif + +#include "common.h" +#include "dhcpd.h" +#include "options.h" + + +void udhcp_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 udhcp_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("cannot read on listening socket, ignoring"); + return -1; + } + + if (ntohl(packet->cookie) != DHCP_MAGIC) { + bb_error_msg("received bogus message, ignoring"); + return -2; + } + DEBUG("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("broken client (%s), forcing broadcast", + broken_vendors[i]); + packet->flags |= htons(BROADCAST_FLAG); + } + } + } + + return bytes; +} + + +uint16_t udhcp_checksum(void *addr, int count) +{ + /* Compute Internet Checksum for "count" bytes + * beginning at location "addr". + */ + 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 */ +void BUG_sizeof_struct_udp_dhcp_packet_must_be_576(void); +int udhcp_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; + + fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP)); + if (fd < 0) { + bb_perror_msg("socket"); + 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) { + bb_perror_msg("bind"); + 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 = udhcp_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 = udhcp_checksum(&(packet.ip), sizeof(packet.ip)); + + if (sizeof(struct udp_dhcp_packet) != 576) + BUG_sizeof_struct_udp_dhcp_packet_must_be_576(); + + result = sendto(fd, &packet, sizeof(struct udp_dhcp_packet), 0, + (struct sockaddr *) &dest, sizeof(dest)); + if (result <= 0) { + bb_perror_msg("sendto"); + } + close(fd); + return result; +} + + +/* Let the kernel do all the work for packet generation */ +int udhcp_kernel_packet(struct dhcpMessage *payload, + uint32_t source_ip, int source_port, + uint32_t dest_ip, int dest_port) +{ + int fd, result; + struct sockaddr_in client; + + fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP); + if (fd < 0) + return -1; + + if (setsockopt_reuseaddr(fd) == -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; +} -- cgit v1.2.3