| /* -*- Mode: C; tab-width: 4 -*- |
| * |
| * Copyright (c) 2002-2004 Apple Computer, Inc. All rights reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "mDNSUNP.h" |
| |
| #include <errno.h> |
| #include <assert.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <sys/uio.h> |
| #include <sys/ioctl.h> |
| #include <signal.h> |
| #include <unistd.h> |
| #include <stdio.h> |
| |
| /* Some weird platforms derived from 4.4BSD Lite (e.g. EFI) need the ALIGN(P) |
| macro, usually defined in <sys/param.h> or someplace like that, to make sure the |
| CMSG_NXTHDR macro is well-formed. On such platforms, the symbol NEED_ALIGN_MACRO |
| should be set to the name of the header to include to get the ALIGN(P) macro. |
| */ |
| #ifdef NEED_ALIGN_MACRO |
| #include NEED_ALIGN_MACRO |
| #endif |
| |
| /* Solaris defined SIOCGIFCONF etc in <sys/sockio.h> but |
| other platforms don't even have that include file. So, |
| if we haven't yet got a definition, let's try to find |
| <sys/sockio.h>. |
| */ |
| |
| #ifndef SIOCGIFCONF |
| #include <sys/sockio.h> |
| #endif |
| |
| /* sockaddr_dl is only referenced if we're using IP_RECVIF, |
| so only include the header in that case. |
| */ |
| |
| #ifdef IP_RECVIF |
| #include <net/if_dl.h> |
| #endif |
| |
| #if defined(AF_INET6) && HAVE_IPV6 && !HAVE_LINUX |
| #include <net/if_var.h> |
| #include <netinet/in_var.h> |
| // Note: netinet/in_var.h implicitly includes netinet6/in6_var.h for us |
| #endif |
| |
| #if defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX |
| #include <netdb.h> |
| #include <arpa/inet.h> |
| |
| /* Converts a prefix length to IPv6 network mask */ |
| void plen_to_mask(int plen, char *addr) { |
| int i; |
| int colons=7; /* Number of colons in IPv6 address */ |
| int bits_in_block=16; /* Bits per IPv6 block */ |
| for(i=0;i<=colons;i++) { |
| int block, ones=0xffff, ones_in_block; |
| if (plen>bits_in_block) ones_in_block=bits_in_block; |
| else ones_in_block=plen; |
| block = ones & (ones << (bits_in_block-ones_in_block)); |
| i==0 ? sprintf(addr, "%x", block) : sprintf(addr, "%s:%x", addr, block); |
| plen -= ones_in_block; |
| } |
| } |
| |
| /* Gets IPv6 interface information from the /proc filesystem in linux*/ |
| struct ifi_info *get_ifi_info_linuxv6(int family, int doaliases) |
| { |
| struct ifi_info *ifi, *ifihead, **ifipnext, *ifipold, **ifiptr; |
| FILE *fp; |
| char addr[8][5]; |
| int flags, myflags, index, plen, scope; |
| char ifname[9], lastname[IFNAMSIZ]; |
| char addr6[32+7+1]; /* don't forget the seven ':' */ |
| struct addrinfo hints, *res0; |
| struct sockaddr_in6 *sin6; |
| struct in6_addr *addrptr; |
| int err; |
| int sockfd = -1; |
| struct ifreq ifr; |
| |
| res0=NULL; |
| ifihead = NULL; |
| ifipnext = &ifihead; |
| lastname[0] = 0; |
| |
| if ((fp = fopen(PROC_IFINET6_PATH, "r")) != NULL) { |
| sockfd = socket(AF_INET6, SOCK_DGRAM, 0); |
| if (sockfd < 0) { |
| goto gotError; |
| } |
| while (fscanf(fp, |
| "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %8s\n", |
| addr[0],addr[1],addr[2],addr[3], |
| addr[4],addr[5],addr[6],addr[7], |
| &index, &plen, &scope, &flags, ifname) != EOF) { |
| |
| myflags = 0; |
| if (strncmp(lastname, ifname, IFNAMSIZ) == 0) { |
| if (doaliases == 0) |
| continue; /* already processed this interface */ |
| myflags = IFI_ALIAS; |
| } |
| strncpy(lastname, ifname, IFNAMSIZ); |
| ifi = (struct ifi_info*)calloc(1, sizeof(struct ifi_info)); |
| if (ifi == NULL) { |
| goto gotError; |
| } |
| |
| ifipold = *ifipnext; /* need this later */ |
| ifiptr = ifipnext; |
| *ifipnext = ifi; /* prev points to this new one */ |
| ifipnext = &ifi->ifi_next; /* pointer to next one goes here */ |
| |
| sprintf(addr6, "%s:%s:%s:%s:%s:%s:%s:%s", |
| addr[0],addr[1],addr[2],addr[3], |
| addr[4],addr[5],addr[6],addr[7]); |
| |
| /* Add address of the interface */ |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_family = AF_INET6; |
| hints.ai_flags = AI_NUMERICHOST; |
| err = getaddrinfo(addr6, NULL, &hints, &res0); |
| if (err) { |
| goto gotError; |
| } |
| ifi->ifi_addr = calloc(1, sizeof(struct sockaddr_in6)); |
| if (ifi->ifi_addr == NULL) { |
| goto gotError; |
| } |
| memcpy(ifi->ifi_addr, res0->ai_addr, sizeof(struct sockaddr_in6)); |
| |
| /* Add netmask of the interface */ |
| char ipv6addr[INET6_ADDRSTRLEN]; |
| plen_to_mask(plen, ipv6addr); |
| ifi->ifi_netmask = calloc(1, sizeof(struct sockaddr_in6)); |
| if (ifi->ifi_addr == NULL) { |
| goto gotError; |
| } |
| sin6=calloc(1, sizeof(struct sockaddr_in6)); |
| addrptr=calloc(1, sizeof(struct in6_addr)); |
| inet_pton(family, ipv6addr, addrptr); |
| sin6->sin6_family=family; |
| sin6->sin6_addr=*addrptr; |
| sin6->sin6_scope_id=scope; |
| memcpy(ifi->ifi_netmask, sin6, sizeof(struct sockaddr_in6)); |
| free(sin6); |
| |
| |
| /* Add interface name */ |
| strncpy(ifi->ifi_name, ifname, IFI_NAME); |
| |
| /* Add interface index */ |
| ifi->ifi_index = index; |
| |
| /* Add interface flags*/ |
| strncpy(ifr.ifr_name, ifname, IFNAMSIZ); |
| if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) { |
| if (errno == EADDRNOTAVAIL) { |
| /* |
| * If the main interface is configured with no IP address but |
| * an alias interface exists with an IP address, you get |
| * EADDRNOTAVAIL for the main interface |
| */ |
| free(ifi->ifi_addr); |
| free(ifi); |
| ifipnext = ifiptr; |
| *ifipnext = ifipold; |
| continue; |
| } else { |
| goto gotError; |
| } |
| } |
| ifi->ifi_flags = ifr.ifr_flags; |
| freeaddrinfo(res0); |
| res0=NULL; |
| } |
| } |
| goto done; |
| |
| gotError: |
| if (ifihead != NULL) { |
| free_ifi_info(ifihead); |
| ifihead = NULL; |
| } |
| if (res0 != NULL) { |
| freeaddrinfo(res0); |
| res0=NULL; |
| } |
| done: |
| if (sockfd != -1) { |
| assert(close(sockfd) == 0); |
| } |
| return(ifihead); /* pointer to first structure in linked list */ |
| } |
| #endif // defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX |
| |
| struct ifi_info *get_ifi_info(int family, int doaliases) |
| { |
| int junk; |
| struct ifi_info *ifi, *ifihead, **ifipnext, *ifipold, **ifiptr; |
| int sockfd, sockf6, len, lastlen, flags, myflags; |
| #ifdef NOT_HAVE_IF_NAMETOINDEX |
| int index = 200; |
| #endif |
| char *ptr, *buf, lastname[IFNAMSIZ], *cptr; |
| struct ifconf ifc; |
| struct ifreq *ifr, ifrcopy; |
| struct sockaddr_in *sinptr; |
| |
| #if defined(AF_INET6) && HAVE_IPV6 |
| struct sockaddr_in6 *sinptr6; |
| #endif |
| |
| #if defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX |
| if (family == AF_INET6) return get_ifi_info_linuxv6(family, doaliases); |
| #endif |
| |
| sockfd = -1; |
| sockf6 = -1; |
| buf = NULL; |
| ifihead = NULL; |
| |
| sockfd = socket(AF_INET, SOCK_DGRAM, 0); |
| if (sockfd < 0) { |
| goto gotError; |
| } |
| |
| lastlen = 0; |
| len = 100 * sizeof(struct ifreq); /* initial buffer size guess */ |
| for ( ; ; ) { |
| buf = (char*)malloc(len); |
| if (buf == NULL) { |
| goto gotError; |
| } |
| ifc.ifc_len = len; |
| ifc.ifc_buf = buf; |
| if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) { |
| if (errno != EINVAL || lastlen != 0) { |
| goto gotError; |
| } |
| } else { |
| if (ifc.ifc_len == lastlen) |
| break; /* success, len has not changed */ |
| lastlen = ifc.ifc_len; |
| } |
| len += 10 * sizeof(struct ifreq); /* increment */ |
| free(buf); |
| } |
| ifihead = NULL; |
| ifipnext = &ifihead; |
| lastname[0] = 0; |
| /* end get_ifi_info1 */ |
| |
| /* include get_ifi_info2 */ |
| for (ptr = buf; ptr < buf + ifc.ifc_len; ) { |
| ifr = (struct ifreq *) ptr; |
| |
| /* Advance to next one in buffer */ |
| if (sizeof(struct ifreq) > sizeof(ifr->ifr_name) + GET_SA_LEN(ifr->ifr_addr)) |
| ptr += sizeof(struct ifreq); |
| else |
| ptr += sizeof(ifr->ifr_name) + GET_SA_LEN(ifr->ifr_addr); |
| |
| // fprintf(stderr, "intf %p name=%s AF=%d\n", index, ifr->ifr_name, ifr->ifr_addr.sa_family); |
| |
| if (ifr->ifr_addr.sa_family != family) |
| continue; /* ignore if not desired address family */ |
| |
| myflags = 0; |
| if ( (cptr = strchr(ifr->ifr_name, ':')) != NULL) |
| *cptr = 0; /* replace colon will null */ |
| if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0) { |
| if (doaliases == 0) |
| continue; /* already processed this interface */ |
| myflags = IFI_ALIAS; |
| } |
| memcpy(lastname, ifr->ifr_name, IFNAMSIZ); |
| |
| ifrcopy = *ifr; |
| if (ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy) < 0) { |
| goto gotError; |
| } |
| |
| flags = ifrcopy.ifr_flags; |
| if ((flags & IFF_UP) == 0) |
| continue; /* ignore if interface not up */ |
| |
| ifi = (struct ifi_info*)calloc(1, sizeof(struct ifi_info)); |
| if (ifi == NULL) { |
| goto gotError; |
| } |
| ifipold = *ifipnext; /* need this later */ |
| ifiptr = ifipnext; |
| *ifipnext = ifi; /* prev points to this new one */ |
| ifipnext = &ifi->ifi_next; /* pointer to next one goes here */ |
| |
| ifi->ifi_flags = flags; /* IFF_xxx values */ |
| ifi->ifi_myflags = myflags; /* IFI_xxx values */ |
| #ifndef NOT_HAVE_IF_NAMETOINDEX |
| ifi->ifi_index = if_nametoindex(ifr->ifr_name); |
| #else |
| ifrcopy = *ifr; |
| #ifdef SIOCGIFINDEX |
| if ( 0 >= ioctl(sockfd, SIOCGIFINDEX, &ifrcopy)) |
| ifi->ifi_index = ifrcopy.ifr_index; |
| else |
| #endif |
| ifi->ifi_index = index++; /* SIOCGIFINDEX is broken on Solaris 2.5ish, so fake it */ |
| #endif |
| memcpy(ifi->ifi_name, ifr->ifr_name, IFI_NAME); |
| ifi->ifi_name[IFI_NAME-1] = '\0'; |
| /* end get_ifi_info2 */ |
| /* include get_ifi_info3 */ |
| switch (ifr->ifr_addr.sa_family) { |
| case AF_INET: |
| sinptr = (struct sockaddr_in *) &ifr->ifr_addr; |
| if (ifi->ifi_addr == NULL) { |
| ifi->ifi_addr = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in)); |
| if (ifi->ifi_addr == NULL) { |
| goto gotError; |
| } |
| memcpy(ifi->ifi_addr, sinptr, sizeof(struct sockaddr_in)); |
| |
| #ifdef SIOCGIFNETMASK |
| if (ioctl(sockfd, SIOCGIFNETMASK, &ifrcopy) < 0) { |
| if (errno == EADDRNOTAVAIL) { |
| /* |
| * If the main interface is configured with no IP address but |
| * an alias interface exists with an IP address, you get |
| * EADDRNOTAVAIL for the main interface |
| */ |
| free(ifi->ifi_addr); |
| free(ifi); |
| ifipnext = ifiptr; |
| *ifipnext = ifipold; |
| continue; |
| } else { |
| goto gotError; |
| } |
| } |
| |
| ifi->ifi_netmask = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in)); |
| if (ifi->ifi_netmask == NULL) goto gotError; |
| sinptr = (struct sockaddr_in *) &ifrcopy.ifr_addr; |
| /* The BSD ioctls (including Mac OS X) stick some weird values in for sin_len and sin_family */ |
| #ifndef NOT_HAVE_SA_LEN |
| sinptr->sin_len = sizeof(struct sockaddr_in); |
| #endif |
| sinptr->sin_family = AF_INET; |
| memcpy(ifi->ifi_netmask, sinptr, sizeof(struct sockaddr_in)); |
| #endif |
| |
| #ifdef SIOCGIFBRDADDR |
| if (flags & IFF_BROADCAST) { |
| if (ioctl(sockfd, SIOCGIFBRDADDR, &ifrcopy) < 0) { |
| goto gotError; |
| } |
| sinptr = (struct sockaddr_in *) &ifrcopy.ifr_broadaddr; |
| /* The BSD ioctls (including Mac OS X) stick some weird values in for sin_len and sin_family */ |
| #ifndef NOT_HAVE_SA_LEN |
| sinptr->sin_len = sizeof( struct sockaddr_in ); |
| #endif |
| sinptr->sin_family = AF_INET; |
| ifi->ifi_brdaddr = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in)); |
| if (ifi->ifi_brdaddr == NULL) { |
| goto gotError; |
| } |
| memcpy(ifi->ifi_brdaddr, sinptr, sizeof(struct sockaddr_in)); |
| } |
| #endif |
| |
| #ifdef SIOCGIFDSTADDR |
| if (flags & IFF_POINTOPOINT) { |
| if (ioctl(sockfd, SIOCGIFDSTADDR, &ifrcopy) < 0) { |
| goto gotError; |
| } |
| sinptr = (struct sockaddr_in *) &ifrcopy.ifr_dstaddr; |
| /* The BSD ioctls (including Mac OS X) stick some weird values in for sin_len and sin_family */ |
| #ifndef NOT_HAVE_SA_LEN |
| sinptr->sin_len = sizeof( struct sockaddr_in ); |
| #endif |
| sinptr->sin_family = AF_INET; |
| ifi->ifi_dstaddr = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in)); |
| if (ifi->ifi_dstaddr == NULL) { |
| goto gotError; |
| } |
| memcpy(ifi->ifi_dstaddr, sinptr, sizeof(struct sockaddr_in)); |
| } |
| #endif |
| } |
| break; |
| |
| #if defined(AF_INET6) && HAVE_IPV6 |
| case AF_INET6: |
| sinptr6 = (struct sockaddr_in6 *) &ifr->ifr_addr; |
| if (ifi->ifi_addr == NULL) { |
| ifi->ifi_addr = calloc(1, sizeof(struct sockaddr_in6)); |
| if (ifi->ifi_addr == NULL) { |
| goto gotError; |
| } |
| |
| /* Some platforms (*BSD) inject the prefix in IPv6LL addresses */ |
| /* We need to strip that out */ |
| if (IN6_IS_ADDR_LINKLOCAL(&sinptr6->sin6_addr)) |
| sinptr6->sin6_addr.s6_addr[2] = sinptr6->sin6_addr.s6_addr[3] = 0; |
| memcpy(ifi->ifi_addr, sinptr6, sizeof(struct sockaddr_in6)); |
| |
| #ifdef SIOCGIFNETMASK_IN6 |
| { |
| struct in6_ifreq ifr6; |
| if (sockf6 == -1) |
| sockf6 = socket(AF_INET6, SOCK_DGRAM, 0); |
| memset(&ifr6, 0, sizeof(ifr6)); |
| memcpy(&ifr6.ifr_name, &ifr->ifr_name, sizeof(ifr6.ifr_name )); |
| memcpy(&ifr6.ifr_ifru.ifru_addr, &ifr->ifr_addr, sizeof(ifr6.ifr_ifru.ifru_addr)); |
| if (ioctl(sockf6, SIOCGIFNETMASK_IN6, &ifr6) < 0) { |
| if (errno == EADDRNOTAVAIL) { |
| /* |
| * If the main interface is configured with no IP address but |
| * an alias interface exists with an IP address, you get |
| * EADDRNOTAVAIL for the main interface |
| */ |
| free(ifi->ifi_addr); |
| free(ifi); |
| ifipnext = ifiptr; |
| *ifipnext = ifipold; |
| continue; |
| } else { |
| goto gotError; |
| } |
| } |
| ifi->ifi_netmask = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in6)); |
| if (ifi->ifi_netmask == NULL) goto gotError; |
| sinptr6 = (struct sockaddr_in6 *) &ifr6.ifr_ifru.ifru_addr; |
| memcpy(ifi->ifi_netmask, sinptr6, sizeof(struct sockaddr_in6)); |
| } |
| #endif |
| } |
| break; |
| #endif |
| |
| default: |
| break; |
| } |
| } |
| goto done; |
| |
| gotError: |
| if (ifihead != NULL) { |
| free_ifi_info(ifihead); |
| ifihead = NULL; |
| } |
| |
| done: |
| if (buf != NULL) { |
| free(buf); |
| } |
| if (sockfd != -1) { |
| junk = close(sockfd); |
| assert(junk == 0); |
| } |
| if (sockf6 != -1) { |
| junk = close(sockf6); |
| assert(junk == 0); |
| } |
| return(ifihead); /* pointer to first structure in linked list */ |
| } |
| /* end get_ifi_info3 */ |
| |
| /* include free_ifi_info */ |
| void |
| free_ifi_info(struct ifi_info *ifihead) |
| { |
| struct ifi_info *ifi, *ifinext; |
| |
| for (ifi = ifihead; ifi != NULL; ifi = ifinext) { |
| if (ifi->ifi_addr != NULL) |
| free(ifi->ifi_addr); |
| if (ifi->ifi_netmask != NULL) |
| free(ifi->ifi_netmask); |
| if (ifi->ifi_brdaddr != NULL) |
| free(ifi->ifi_brdaddr); |
| if (ifi->ifi_dstaddr != NULL) |
| free(ifi->ifi_dstaddr); |
| ifinext = ifi->ifi_next; /* can't fetch ifi_next after free() */ |
| free(ifi); /* the ifi_info{} itself */ |
| } |
| } |
| /* end free_ifi_info */ |
| |
| ssize_t |
| recvfrom_flags(int fd, void *ptr, size_t nbytes, int *flagsp, |
| struct sockaddr *sa, socklen_t *salenptr, struct my_in_pktinfo *pktp, u_char *ttl) |
| { |
| struct msghdr msg; |
| struct iovec iov[1]; |
| ssize_t n; |
| |
| #ifdef CMSG_FIRSTHDR |
| struct cmsghdr *cmptr; |
| union { |
| struct cmsghdr cm; |
| char control[1024]; |
| } control_un; |
| |
| *ttl = 255; // If kernel fails to provide TTL data then assume the TTL was 255 as it should be |
| |
| msg.msg_control = control_un.control; |
| msg.msg_controllen = sizeof(control_un.control); |
| msg.msg_flags = 0; |
| #else |
| memset(&msg, 0, sizeof(msg)); /* make certain msg_accrightslen = 0 */ |
| #endif /* CMSG_FIRSTHDR */ |
| |
| msg.msg_name = (char *) sa; |
| msg.msg_namelen = *salenptr; |
| iov[0].iov_base = (char *)ptr; |
| iov[0].iov_len = nbytes; |
| msg.msg_iov = iov; |
| msg.msg_iovlen = 1; |
| |
| if ( (n = recvmsg(fd, &msg, *flagsp)) < 0) |
| return(n); |
| |
| *salenptr = msg.msg_namelen; /* pass back results */ |
| if (pktp) { |
| /* 0.0.0.0, i/f = -1 */ |
| /* We set the interface to -1 so that the caller can |
| tell whether we returned a meaningful value or |
| just some default. Previously this code just |
| set the value to 0, but I'm concerned that 0 |
| might be a valid interface value. |
| */ |
| memset(pktp, 0, sizeof(struct my_in_pktinfo)); |
| pktp->ipi_ifindex = -1; |
| } |
| /* end recvfrom_flags1 */ |
| |
| /* include recvfrom_flags2 */ |
| #ifndef CMSG_FIRSTHDR |
| #warning CMSG_FIRSTHDR not defined. Will not be able to determine destination address, received interface, etc. |
| *flagsp = 0; /* pass back results */ |
| return(n); |
| #else |
| |
| *flagsp = msg.msg_flags; /* pass back results */ |
| if (msg.msg_controllen < (socklen_t)sizeof(struct cmsghdr) || |
| (msg.msg_flags & MSG_CTRUNC) || pktp == NULL) |
| return(n); |
| |
| for (cmptr = CMSG_FIRSTHDR(&msg); cmptr != NULL; |
| cmptr = CMSG_NXTHDR(&msg, cmptr)) { |
| |
| #ifdef IP_PKTINFO |
| #if in_pktinfo_definition_is_missing |
| struct in_pktinfo |
| { |
| int ipi_ifindex; |
| struct in_addr ipi_spec_dst; |
| struct in_addr ipi_addr; |
| }; |
| #endif |
| if (cmptr->cmsg_level == IPPROTO_IP && |
| cmptr->cmsg_type == IP_PKTINFO) { |
| struct in_pktinfo *tmp; |
| struct sockaddr_in *sin = (struct sockaddr_in*)&pktp->ipi_addr; |
| |
| tmp = (struct in_pktinfo *) CMSG_DATA(cmptr); |
| sin->sin_family = AF_INET; |
| sin->sin_addr = tmp->ipi_addr; |
| sin->sin_port = 0; |
| pktp->ipi_ifindex = tmp->ipi_ifindex; |
| continue; |
| } |
| #endif |
| |
| #ifdef IP_RECVDSTADDR |
| if (cmptr->cmsg_level == IPPROTO_IP && |
| cmptr->cmsg_type == IP_RECVDSTADDR) { |
| struct sockaddr_in *sin = (struct sockaddr_in*)&pktp->ipi_addr; |
| |
| sin->sin_family = AF_INET; |
| sin->sin_addr = *(struct in_addr*)CMSG_DATA(cmptr); |
| sin->sin_port = 0; |
| continue; |
| } |
| #endif |
| |
| #ifdef IP_RECVIF |
| if (cmptr->cmsg_level == IPPROTO_IP && |
| cmptr->cmsg_type == IP_RECVIF) { |
| struct sockaddr_dl *sdl = (struct sockaddr_dl *) CMSG_DATA(cmptr); |
| #ifndef HAVE_BROKEN_RECVIF_NAME |
| int nameLen = (sdl->sdl_nlen < IFI_NAME - 1) ? sdl->sdl_nlen : (IFI_NAME - 1); |
| strncpy(pktp->ipi_ifname, sdl->sdl_data, nameLen); |
| #endif |
| pktp->ipi_ifindex = sdl->sdl_index; |
| #ifdef HAVE_BROKEN_RECVIF_NAME |
| if (sdl->sdl_index == 0) { |
| pktp->ipi_ifindex = *(uint_t*)sdl; |
| } |
| #endif |
| assert(pktp->ipi_ifname[IFI_NAME - 1] == 0); |
| // null terminated because of memset above |
| continue; |
| } |
| #endif |
| |
| #ifdef IP_RECVTTL |
| if (cmptr->cmsg_level == IPPROTO_IP && |
| cmptr->cmsg_type == IP_RECVTTL) { |
| *ttl = *(u_char*)CMSG_DATA(cmptr); |
| continue; |
| } |
| else if (cmptr->cmsg_level == IPPROTO_IP && |
| cmptr->cmsg_type == IP_TTL) { // some implementations seem to send IP_TTL instead of IP_RECVTTL |
| *ttl = *(int*)CMSG_DATA(cmptr); |
| continue; |
| } |
| #endif |
| |
| #if defined(IPV6_PKTINFO) && HAVE_IPV6 |
| if (cmptr->cmsg_level == IPPROTO_IPV6 && |
| cmptr->cmsg_type == IPV6_2292_PKTINFO) { |
| struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)&pktp->ipi_addr; |
| struct in6_pktinfo *ip6_info = (struct in6_pktinfo*)CMSG_DATA(cmptr); |
| |
| sin6->sin6_family = AF_INET6; |
| #ifndef NOT_HAVE_SA_LEN |
| sin6->sin6_len = sizeof(*sin6); |
| #endif |
| sin6->sin6_addr = ip6_info->ipi6_addr; |
| sin6->sin6_flowinfo = 0; |
| sin6->sin6_scope_id = 0; |
| sin6->sin6_port = 0; |
| pktp->ipi_ifindex = ip6_info->ipi6_ifindex; |
| continue; |
| } |
| #endif |
| |
| #if defined(IPV6_HOPLIMIT) && HAVE_IPV6 |
| if (cmptr->cmsg_level == IPPROTO_IPV6 && |
| cmptr->cmsg_type == IPV6_2292_HOPLIMIT) { |
| *ttl = *(int*)CMSG_DATA(cmptr); |
| continue; |
| } |
| #endif |
| assert(0); // unknown ancillary data |
| } |
| return(n); |
| #endif /* CMSG_FIRSTHDR */ |
| } |
| |
| // ********************************************************************************************** |
| |
| // daemonize the process. Adapted from "Unix Network Programming" vol 1 by Stevens, section 12.4. |
| // Returns 0 on success, -1 on failure. |
| |
| #ifdef NOT_HAVE_DAEMON |
| #include <fcntl.h> |
| #include <sys/stat.h> |
| #include <sys/signal.h> |
| |
| int daemon(int nochdir, int noclose) |
| { |
| switch (fork()) |
| { |
| case -1: return (-1); // Fork failed |
| case 0: break; // Child -- continue |
| default: _exit(0); // Parent -- exit |
| } |
| |
| if (setsid() == -1) return(-1); |
| |
| signal(SIGHUP, SIG_IGN); |
| |
| switch (fork()) // Fork again, primarily for reasons of Unix trivia |
| { |
| case -1: return (-1); // Fork failed |
| case 0: break; // Child -- continue |
| default: _exit(0); // Parent -- exit |
| } |
| |
| if (!nochdir) (void)chdir("/"); |
| umask(0); |
| |
| if (!noclose) |
| { |
| int fd = open("/dev/null", O_RDWR, 0); |
| if (fd != -1) |
| { |
| // Avoid unnecessarily duplicating a file descriptor to itself |
| if (fd != STDIN_FILENO) (void)dup2(fd, STDIN_FILENO); |
| if (fd != STDOUT_FILENO) (void)dup2(fd, STDOUT_FILENO); |
| if (fd != STDERR_FILENO) (void)dup2(fd, STDERR_FILENO); |
| if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO) |
| (void)close (fd); |
| } |
| } |
| return (0); |
| } |
| #endif /* NOT_HAVE_DAEMON */ |
