1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * socket.c -- DHCP server client/server socket creation
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4 | *
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5 | * udhcp client/server
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6 | * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
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7 | * Chris Trew <ctrew@moreton.com.au>
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8 | *
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9 | * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
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10 | *
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11 | * This program is free software; you can redistribute it and/or modify
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12 | * it under the terms of the GNU General Public License as published by
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13 | * the Free Software Foundation; either version 2 of the License, or
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14 | * (at your option) any later version.
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15 | *
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16 | * This program is distributed in the hope that it will be useful,
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17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 | * GNU General Public License for more details.
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20 | *
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21 | * You should have received a copy of the GNU General Public License
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22 | * along with this program; if not, write to the Free Software
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23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 | */
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25 |
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26 | #include <net/if.h>
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27 | #include <features.h>
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28 | #if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION
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29 | #include <netpacket/packet.h>
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30 | #include <net/ethernet.h>
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31 | #else
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32 | #include <asm/types.h>
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33 | #include <linux/if_packet.h>
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34 | #include <linux/if_ether.h>
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35 | #endif
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36 |
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37 | #include "common.h"
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38 |
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39 |
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40 | int read_interface(const char *interface, int *ifindex, uint32_t *addr, uint8_t *arp)
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41 | {
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42 | int fd;
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43 | struct ifreq ifr;
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44 | struct sockaddr_in *our_ip;
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45 |
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46 | memset(&ifr, 0, sizeof(ifr));
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47 | fd = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
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48 |
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49 | ifr.ifr_addr.sa_family = AF_INET;
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50 | strncpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name));
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51 | if (addr) {
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52 | if (ioctl_or_perror(fd, SIOCGIFADDR, &ifr,
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53 | "is interface %s up and configured?", interface)
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54 | ) {
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55 | close(fd);
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56 | return -1;
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57 | }
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58 | our_ip = (struct sockaddr_in *) &ifr.ifr_addr;
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59 | *addr = our_ip->sin_addr.s_addr;
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60 | DEBUG("%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr));
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61 | }
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62 |
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63 | if (ifindex) {
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64 | if (ioctl_or_warn(fd, SIOCGIFINDEX, &ifr) != 0) {
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65 | close(fd);
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66 | return -1;
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67 | }
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68 | DEBUG("adapter index %d", ifr.ifr_ifindex);
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69 | *ifindex = ifr.ifr_ifindex;
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70 | }
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71 |
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72 | if (arp) {
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73 | if (ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr) != 0) {
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74 | close(fd);
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75 | return -1;
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76 | }
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77 | memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
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78 | DEBUG("adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
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79 | arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
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80 | }
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81 |
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82 | close(fd);
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83 | return 0;
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84 | }
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85 |
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86 | /* 1. None of the callers expects it to ever fail */
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87 | /* 2. ip was always INADDR_ANY */
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88 | int listen_socket(/*uint32_t ip,*/ int port, const char *inf)
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89 | {
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90 | int fd;
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91 | struct ifreq interface;
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92 | struct sockaddr_in addr;
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93 |
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94 | DEBUG("Opening listen socket on *:%d %s", port, inf);
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95 | fd = xsocket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
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96 |
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97 | setsockopt_reuseaddr(fd);
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98 | if (setsockopt_broadcast(fd) == -1)
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99 | bb_perror_msg_and_die("SO_BROADCAST");
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100 |
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101 | strncpy(interface.ifr_name, inf, IFNAMSIZ);
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102 | if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &interface, sizeof(interface)) == -1)
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103 | bb_perror_msg_and_die("SO_BINDTODEVICE");
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104 |
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105 | memset(&addr, 0, sizeof(addr));
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106 | addr.sin_family = AF_INET;
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107 | addr.sin_port = htons(port);
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108 | /* addr.sin_addr.s_addr = ip; - all-zeros is INADDR_ANY */
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109 | xbind(fd, (struct sockaddr *)&addr, sizeof(addr));
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110 |
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111 | return fd;
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112 | }
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