/* -*- Mode: C; tab-width: 4 -*-
*
- * Copyright (c) 2002-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2002-2018 Apple 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.
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,
+/* 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;
- }
- memcpy(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 */
- memcpy(ifi->ifi_name, ifname, IFI_NAME);
-
- /* Add interface index */
- ifi->ifi_index = index;
-
- /* Add interface flags*/
- memcpy(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
+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;
+ struct msghdr msg;
+ struct iovec iov[1];
+ ssize_t n;
#ifdef CMSG_FIRSTHDR
struct cmsghdr *cmptr;
union {
- struct cmsghdr cm;
- char control[1024];
+ 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
+ *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);
*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
+ /* 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;
}
/* include recvfrom_flags2 */
#ifndef CMSG_FIRSTHDR
- #warning CMSG_FIRSTHDR not defined. Will not be able to determine destination address, received interface, etc.
+ #warning CMSG_FIRSTHDR not defined. Will not be able to determine destination address, received interface, etc.
*flagsp = 0; /* pass back results */
return(n);
#else
#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;
-};
+ struct in_pktinfo
+ {
+ int ipi_ifindex;
+ struct in_addr ipi_spec_dst;
+ struct in_addr ipi_addr;
+ };
#endif
- if (cmptr->cmsg_level == IPPROTO_IP &&
+ 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;
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;
#endif
pktp->ipi_ifindex = sdl->sdl_index;
#ifdef HAVE_BROKEN_RECVIF_NAME
- if (sdl->sdl_index == 0) {
- pktp->ipi_ifindex = *(uint_t*)sdl;
- }
-#endif
+ 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;
#ifdef IP_RECVTTL
if (cmptr->cmsg_level == IPPROTO_IP &&
cmptr->cmsg_type == IP_RECVTTL) {
- *ttl = *(u_char*)CMSG_DATA(cmptr);
+ *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);
+ 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 &&
+#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);
-
+ 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);
sin6->sin6_flowinfo = 0;
sin6->sin6_scope_id = 0;
sin6->sin6_port = 0;
- pktp->ipi_ifindex = ip6_info->ipi6_ifindex;
+ pktp->ipi_ifindex = ip6_info->ipi6_ifindex;
continue;
}
#endif
#if defined(IPV6_HOPLIMIT) && HAVE_IPV6
- if (cmptr->cmsg_level == IPPROTO_IPV6 &&
+ if (cmptr->cmsg_level == IPPROTO_IPV6 &&
cmptr->cmsg_type == IPV6_2292_HOPLIMIT) {
- *ttl = *(int*)CMSG_DATA(cmptr);
+ *ttl = *(int*)CMSG_DATA(cmptr);
continue;
}
#endif
#include <sys/signal.h>
int daemon(int nochdir, int noclose)
+{
+ switch (fork())
{
- 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);
+ 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 */
projects / apple / mdnsresponder.git / blobdiff