[1770] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 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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[1770] | 28 | #if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION
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[821] | 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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[1770] | 39 |
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| 40 | int read_interface(const char *interface, int *ifindex, uint32_t *addr, uint8_t *arp)
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[821] | 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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[1770] | 46 | memset(&ifr, 0, sizeof(ifr));
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| 47 | fd = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
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[821] | 48 |
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[1770] | 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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[821] | 57 | }
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[1770] | 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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[821] | 62 |
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[1770] | 63 | if (ifindex) {
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| 64 | if (ioctl_or_warn(fd, SIOCGIFINDEX, &ifr) != 0) {
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[821] | 65 | close(fd);
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| 66 | return -1;
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| 67 | }
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[1770] | 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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[821] | 74 | close(fd);
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| 75 | return -1;
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| 76 | }
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[1770] | 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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[821] | 80 | }
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[1770] | 81 |
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[821] | 82 | close(fd);
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| 83 | return 0;
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| 84 | }
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| 85 |
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[1770] | 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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[821] | 89 | {
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[1770] | 90 | int fd;
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[821] | 91 | struct ifreq interface;
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| 92 | struct sockaddr_in addr;
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| 93 |
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[1770] | 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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[821] | 96 |
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[1770] | 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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[821] | 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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[1770] | 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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[821] | 110 |
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| 111 | return fd;
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| 112 | }
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