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    Contents of /trunk/mkinitrd-magellan/busybox/networking/udhcp/socket.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 3289 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * socket.c -- DHCP server client/server socket creation
    4 *
    5 * udhcp client/server
    6 * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
    7 * Chris Trew <ctrew@moreton.com.au>
    8 *
    9 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
    10 *
    11 * This program is free software; you can redistribute it and/or modify
    12 * it under the terms of the GNU General Public License as published by
    13 * the Free Software Foundation; either version 2 of the License, or
    14 * (at your option) any later version.
    15 *
    16 * This program is distributed in the hope that it will be useful,
    17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
    18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    19 * GNU General Public License for more details.
    20 *
    21 * You should have received a copy of the GNU General Public License
    22 * along with this program; if not, write to the Free Software
    23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    24 */
    25
    26 #include <net/if.h>
    27 #include <features.h>
    28 #if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION
    29 #include <netpacket/packet.h>
    30 #include <net/ethernet.h>
    31 #else
    32 #include <asm/types.h>
    33 #include <linux/if_packet.h>
    34 #include <linux/if_ether.h>
    35 #endif
    36
    37 #include "common.h"
    38
    39
    40 int read_interface(char *interface, int *ifindex, uint32_t *addr, uint8_t *arp)
    41 {
    42 int fd;
    43 struct ifreq ifr;
    44 struct sockaddr_in *our_ip;
    45
    46 memset(&ifr, 0, sizeof(struct ifreq));
    47 fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
    48 if (fd < 0) {
    49 bb_perror_msg("socket failed");
    50 return -1;
    51 }
    52
    53 ifr.ifr_addr.sa_family = AF_INET;
    54 strncpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name));
    55 if (addr) {
    56 if (ioctl(fd, SIOCGIFADDR, &ifr) != 0) {
    57 bb_perror_msg("SIOCGIFADDR failed, is the interface up and configured?");
    58 close(fd);
    59 return -1;
    60 }
    61 our_ip = (struct sockaddr_in *) &ifr.ifr_addr;
    62 *addr = our_ip->sin_addr.s_addr;
    63 DEBUG("%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr));
    64 }
    65
    66 if (ifindex) {
    67 if (ioctl(fd, SIOCGIFINDEX, &ifr) != 0) {
    68 bb_perror_msg("SIOCGIFINDEX failed");
    69 close(fd);
    70 return -1;
    71 }
    72 DEBUG("adapter index %d", ifr.ifr_ifindex);
    73 *ifindex = ifr.ifr_ifindex;
    74 }
    75
    76 if (arp) {
    77 if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0) {
    78 bb_perror_msg("SIOCGIFHWADDR failed");
    79 close(fd);
    80 return -1;
    81 }
    82 memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
    83 DEBUG("adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
    84 arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
    85 }
    86
    87 return 0;
    88 }
    89
    90
    91 int listen_socket(uint32_t ip, int port, char *inf)
    92 {
    93 struct ifreq interface;
    94 int fd;
    95 struct sockaddr_in addr;
    96
    97 DEBUG("Opening listen socket on 0x%08x:%d %s", ip, port, inf);
    98 fd = xsocket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
    99
    100 memset(&addr, 0, sizeof(addr));
    101 addr.sin_family = AF_INET;
    102 addr.sin_port = htons(port);
    103 addr.sin_addr.s_addr = ip;
    104
    105 if (setsockopt_reuseaddr(fd) == -1) {
    106 close(fd);
    107 return -1;
    108 }
    109 if (setsockopt_broadcast(fd) == -1) {
    110 close(fd);
    111 return -1;
    112 }
    113
    114 strncpy(interface.ifr_name, inf, IFNAMSIZ);
    115 if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, (char *)&interface, sizeof(interface)) < 0) {
    116 close(fd);
    117 return -1;
    118 }
    119
    120 if (bind(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) == -1) {
    121 close(fd);
    122 return -1;
    123 }
    124
    125 return fd;
    126 }