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author | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 19:29:22 -0800 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 19:29:22 -0800 |
commit | f7c5421560640d23fc10803b9d59a9ff1d83e467 (patch) | |
tree | d6ae69d0d3f4a4d760a3254ec326bca4a8afacfe /if-bsd.c | |
parent | d97c47cad830d00c9da685cc4ea157d6185f6c97 (diff) | |
download | external_dhcpcd-f7c5421560640d23fc10803b9d59a9ff1d83e467.zip external_dhcpcd-f7c5421560640d23fc10803b9d59a9ff1d83e467.tar.gz external_dhcpcd-f7c5421560640d23fc10803b9d59a9ff1d83e467.tar.bz2 |
auto import from //depot/cupcake/@135843
Diffstat (limited to 'if-bsd.c')
-rw-r--r-- | if-bsd.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/if-bsd.c b/if-bsd.c new file mode 100644 index 0000000..bbf1a95 --- /dev/null +++ b/if-bsd.c @@ -0,0 +1,241 @@ +/* + * dhcpcd - DHCP client daemon + * Copyright 2006-2008 Roy Marples <roy@marples.name> + * All rights reserved + + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/stat.h> +#include <sys/ioctl.h> +#include <sys/param.h> + +#include <arpa/inet.h> +#include <net/if_dl.h> +#include <net/if_types.h> +#include <net/route.h> +#include <netinet/in.h> + +#include <errno.h> +#include <stddef.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "config.h" +#include "common.h" +#include "dhcp.h" +#include "net.h" + +/* Darwin doesn't define this for some very odd reason */ +#ifndef SA_SIZE +# define SA_SIZE(sa) \ + ( (!(sa) || ((struct sockaddr *)(sa))->sa_len == 0) ? \ + sizeof(long) : \ + 1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(long) - 1) ) ) +#endif + +int +if_address(const char *ifname, const struct in_addr *address, + const struct in_addr *netmask, const struct in_addr *broadcast, + int action) +{ + int s; + int retval; + struct ifaliasreq ifa; + union { + struct sockaddr *sa; + struct sockaddr_in *sin; + } _s; + + if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1) + return -1; + + memset(&ifa, 0, sizeof(ifa)); + strlcpy(ifa.ifra_name, ifname, sizeof(ifa.ifra_name)); + +#define ADDADDR(_var, _addr) \ + _s.sa = &_var; \ + _s.sin->sin_family = AF_INET; \ + _s.sin->sin_len = sizeof(*_s.sin); \ + memcpy(&_s.sin->sin_addr, _addr, sizeof(_s.sin->sin_addr)); + + ADDADDR(ifa.ifra_addr, address); + ADDADDR(ifa.ifra_mask, netmask); + if (action >= 0) { + ADDADDR(ifa.ifra_broadaddr, broadcast); + } +#undef ADDADDR + + if (action < 0) + retval = ioctl(s, SIOCDIFADDR, &ifa); + else + retval = ioctl(s, SIOCAIFADDR, &ifa); + close(s); + return retval; +} + +int +if_route(const char *ifname, const struct in_addr *destination, + const struct in_addr *netmask, const struct in_addr *gateway, + _unused int metric, int action) +{ + int s; + static int seq; + union sockunion { + struct sockaddr sa; + struct sockaddr_in sin; +#ifdef INET6 + struct sockaddr_in6 sin6; +#endif + struct sockaddr_dl sdl; + struct sockaddr_storage ss; + } su; + struct rtm + { + struct rt_msghdr hdr; + char buffer[sizeof(su) * 3]; + } rtm; + char *bp = rtm.buffer; + size_t l; + unsigned char *hwaddr; + size_t hwlen = 0; + int retval = 0; + + if ((s = socket(PF_ROUTE, SOCK_RAW, 0)) == -1) + return -1; + + memset(&rtm, 0, sizeof(rtm)); + rtm.hdr.rtm_version = RTM_VERSION; + rtm.hdr.rtm_seq = ++seq; + if (action == 0) + rtm.hdr.rtm_type = RTM_CHANGE; + else if (action > 0) + rtm.hdr.rtm_type = RTM_ADD; + else + rtm.hdr.rtm_type = RTM_DELETE; + rtm.hdr.rtm_flags = RTF_UP | RTF_STATIC; + if (netmask->s_addr == INADDR_BROADCAST) + rtm.hdr.rtm_flags |= RTF_HOST; + + /* This order is important */ + rtm.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; + +#define ADDADDR(_addr) \ + memset (&su, 0, sizeof(su)); \ + su.sin.sin_family = AF_INET; \ + su.sin.sin_len = sizeof(su.sin); \ + memcpy (&su.sin.sin_addr, _addr, sizeof(su.sin.sin_addr)); \ + l = SA_SIZE (&(su.sa)); \ + memcpy (bp, &(su), l); \ + bp += l; + + ADDADDR(destination); + + if (gateway->s_addr == INADDR_ANY) { + /* Make us a link layer socket */ + hwaddr = xmalloc(sizeof(unsigned char) * HWADDR_LEN); + do_interface(ifname, hwaddr, &hwlen, NULL, 0, 0); + memset(&su, 0, sizeof(su)); + su.sdl.sdl_len = sizeof(su.sdl); + su.sdl.sdl_family = AF_LINK; + su.sdl.sdl_nlen = strlen(ifname); + memcpy(&su.sdl.sdl_data, ifname, (size_t)su.sdl.sdl_nlen); + su.sdl.sdl_alen = hwlen; + memcpy(((unsigned char *)&su.sdl.sdl_data) + su.sdl.sdl_nlen, + hwaddr, (size_t)su.sdl.sdl_alen); + + l = SA_SIZE(&(su.sa)); + memcpy(bp, &su, l); + bp += l; + free(hwaddr); + } else { + rtm.hdr.rtm_flags |= RTF_GATEWAY; + ADDADDR(gateway); + } + + ADDADDR(netmask); +#undef ADDADDR + + rtm.hdr.rtm_msglen = l = bp - (char *)&rtm; + if (write(s, &rtm, l) == -1) + retval = -1; + close(s); + return retval; +} + +int +open_link_socket(struct interface *iface) +{ + int fd; + + fd = socket(PF_ROUTE, SOCK_RAW, 0); + if (fd == -1) + return -1; + set_cloexec(fd); + if (iface->link_fd != -1) + close(iface->link_fd); + iface->link_fd = fd; + return 0; +} + +#define BUFFER_LEN 2048 +int +link_changed(struct interface *iface) +{ + char buffer[2048], *p; + ssize_t bytes; + struct rt_msghdr *rtm; + struct if_msghdr *ifm; + int i; + + if ((i = if_nametoindex(iface->name)) == -1) + return -1; + for (;;) { + bytes = recv(iface->link_fd, buffer, BUFFER_LEN, MSG_DONTWAIT); + if (bytes == -1) { + if (errno == EAGAIN) + return 0; + if (errno == EINTR) + continue; + return -1; + } + for (p = buffer; bytes > 0; + bytes -= ((struct rt_msghdr *)p)->rtm_msglen, + p += ((struct rt_msghdr *)p)->rtm_msglen) + { + rtm = (struct rt_msghdr *)p; + if (rtm->rtm_type != RTM_IFINFO) + continue; + ifm = (struct if_msghdr *)p; + if (ifm->ifm_index != i) + continue; + + /* Link changed */ + return 1; + } + } + return 0; +} |