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

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 3119 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    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 FAST_FUNC udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac)
    41 {
    42 int fd;
    43 struct ifreq ifr;
    44 struct sockaddr_in *our_ip;
    45
    46 memset(&ifr, 0, sizeof(ifr));
    47 fd = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
    48
    49 ifr.ifr_addr.sa_family = AF_INET;
    50 strncpy_IFNAMSIZ(ifr.ifr_name, interface);
    51 if (nip) {
    52 if (ioctl_or_perror(fd, SIOCGIFADDR, &ifr,
    53 "is interface %s up and configured?", interface)
    54 ) {
    55 close(fd);
    56 return -1;
    57 }
    58 our_ip = (struct sockaddr_in *) &ifr.ifr_addr;
    59 *nip = our_ip->sin_addr.s_addr;
    60 log1("IP %s", inet_ntoa(our_ip->sin_addr));
    61 }
    62
    63 if (ifindex) {
    64 if (ioctl_or_warn(fd, SIOCGIFINDEX, &ifr) != 0) {
    65 close(fd);
    66 return -1;
    67 }
    68 log1("Adapter index %d", ifr.ifr_ifindex);
    69 *ifindex = ifr.ifr_ifindex;
    70 }
    71
    72 if (mac) {
    73 if (ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr) != 0) {
    74 close(fd);
    75 return -1;
    76 }
    77 memcpy(mac, ifr.ifr_hwaddr.sa_data, 6);
    78 log1("MAC %02x:%02x:%02x:%02x:%02x:%02x",
    79 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
    80 }
    81
    82 close(fd);
    83 return 0;
    84 }
    85
    86 /* 1. None of the callers expects it to ever fail */
    87 /* 2. ip was always INADDR_ANY */
    88 int FAST_FUNC udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf)
    89 {
    90 int fd;
    91 struct sockaddr_in addr;
    92
    93 log1("Opening listen socket on *:%d %s", port, inf);
    94 fd = xsocket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
    95
    96 setsockopt_reuseaddr(fd);
    97 if (setsockopt_broadcast(fd) == -1)
    98 bb_perror_msg_and_die("SO_BROADCAST");
    99
    100 /* NB: bug 1032 says this doesn't work on ethernet aliases (ethN:M) */
    101 if (setsockopt_bindtodevice(fd, inf))
    102 xfunc_die(); /* warning is already printed */
    103
    104 memset(&addr, 0, sizeof(addr));
    105 addr.sin_family = AF_INET;
    106 addr.sin_port = htons(port);
    107 /* addr.sin_addr.s_addr = ip; - all-zeros is INADDR_ANY */
    108 xbind(fd, (struct sockaddr *)&addr, sizeof(addr));
    109
    110 return fd;
    111 }