diff options
Diffstat (limited to 'networking/udhcp/socket.c')
| -rw-r--r-- | networking/udhcp/socket.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/networking/udhcp/socket.c b/networking/udhcp/socket.c new file mode 100644 index 0000000..385d5c3 --- /dev/null +++ b/networking/udhcp/socket.c @@ -0,0 +1,111 @@ +/* vi: set sw=4 ts=4: */ +/* + * socket.c -- DHCP server client/server socket creation + * + * udhcp client/server + * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au> + * Chris Trew <ctrew@moreton.com.au> + * + * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <net/if.h> +#include <features.h> +#if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION +#include <netpacket/packet.h> +#include <net/ethernet.h> +#else +#include <asm/types.h> +#include <linux/if_packet.h> +#include <linux/if_ether.h> +#endif + +#include "common.h" + + +int FAST_FUNC udhcp_read_interface(const char *interface, int *ifindex, uint32_t *addr, uint8_t *arp) +{ + int fd; + struct ifreq ifr; + struct sockaddr_in *our_ip; + + memset(&ifr, 0, sizeof(ifr)); + fd = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW); + + ifr.ifr_addr.sa_family = AF_INET; + strncpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name)); + if (addr) { + if (ioctl_or_perror(fd, SIOCGIFADDR, &ifr, + "is interface %s up and configured?", interface) + ) { + close(fd); + return -1; + } + our_ip = (struct sockaddr_in *) &ifr.ifr_addr; + *addr = our_ip->sin_addr.s_addr; + DEBUG("%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr)); + } + + if (ifindex) { + if (ioctl_or_warn(fd, SIOCGIFINDEX, &ifr) != 0) { + close(fd); + return -1; + } + DEBUG("adapter index %d", ifr.ifr_ifindex); + *ifindex = ifr.ifr_ifindex; + } + + if (arp) { + if (ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr) != 0) { + close(fd); + return -1; + } + memcpy(arp, ifr.ifr_hwaddr.sa_data, 6); + DEBUG("adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x", + arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]); + } + + close(fd); + return 0; +} + +/* 1. None of the callers expects it to ever fail */ +/* 2. ip was always INADDR_ANY */ +int FAST_FUNC udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf) +{ + int fd; + struct sockaddr_in addr; + + DEBUG("Opening listen socket on *:%d %s", port, inf); + fd = xsocket(PF_INET, SOCK_DGRAM, IPPROTO_UDP); + + setsockopt_reuseaddr(fd); + if (setsockopt_broadcast(fd) == -1) + bb_perror_msg_and_die("SO_BROADCAST"); + + /* NB: bug 1032 says this doesn't work on ethernet aliases (ethN:M) */ + if (setsockopt_bindtodevice(fd, inf)) + xfunc_die(); /* warning is already printed */ + + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_port = htons(port); + /* addr.sin_addr.s_addr = ip; - all-zeros is INADDR_ANY */ + xbind(fd, (struct sockaddr *)&addr, sizeof(addr)); + + return fd; +} |