smbd/nmbd: Remove HAVE_LONGLONG
[Samba.git] / ctdb / common / system_common.c
blob01ac2bf2d7a980c1834d009e618de160aeb43fa2
1 /*
2 ctdb system specific code to manage raw sockets on linux
4 Copyright (C) Ronnie Sahlberg 2007
5 Copyright (C) Andrew Tridgell 2007
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, see <http://www.gnu.org/licenses/>.
21 #include "includes.h"
22 #include "system/network.h"
25 uint16 checksum for n bytes
27 uint32_t uint16_checksum(uint16_t *data, size_t n)
29 uint32_t sum=0;
30 while (n>=2) {
31 sum += (uint32_t)ntohs(*data);
32 data++;
33 n -= 2;
35 if (n == 1) {
36 sum += (uint32_t)ntohs(*(uint8_t *)data);
38 return sum;
42 see if we currently have an interface with the given IP
44 we try to bind to it, and if that fails then we don't have that IP
45 on an interface
47 bool ctdb_sys_have_ip(ctdb_sock_addr *_addr)
49 int s;
50 int ret;
51 ctdb_sock_addr __addr = *_addr;
52 ctdb_sock_addr *addr = &__addr;
53 socklen_t addrlen = 0;
55 switch (addr->sa.sa_family) {
56 case AF_INET:
57 addr->ip.sin_port = 0;
58 addrlen = sizeof(struct sockaddr_in);
59 break;
60 case AF_INET6:
61 addr->ip6.sin6_port = 0;
62 addrlen = sizeof(struct sockaddr_in6);
63 break;
66 s = socket(addr->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
67 if (s == -1) {
68 return false;
71 ret = bind(s, (struct sockaddr *)addr, addrlen);
73 close(s);
74 return ret == 0;
78 /* find which interface an ip address is currently assigned to */
79 char *ctdb_sys_find_ifname(ctdb_sock_addr *addr)
81 int s;
82 int size;
83 struct ifconf ifc;
84 char *ptr;
86 s = socket(AF_INET, SOCK_RAW, htons(IPPROTO_RAW));
87 if (s == -1) {
88 DEBUG(DEBUG_CRIT,(__location__ " failed to open raw socket (%s)\n",
89 strerror(errno)));
90 return NULL;
94 size = sizeof(struct ifreq);
95 ifc.ifc_buf = NULL;
96 ifc.ifc_len = size;
98 while(ifc.ifc_len > (size - sizeof(struct ifreq))) {
99 size *= 2;
101 free(ifc.ifc_buf);
102 ifc.ifc_len = size;
103 ifc.ifc_buf = malloc(size);
104 memset(ifc.ifc_buf, 0, size);
105 if (ioctl(s, SIOCGIFCONF, (caddr_t)&ifc) < 0) {
106 DEBUG(DEBUG_CRIT,("Failed to read ifc buffer from socket\n"));
107 free(ifc.ifc_buf);
108 close(s);
109 return NULL;
113 for (ptr =(char *)ifc.ifc_buf; ptr < ((char *)ifc.ifc_buf) + ifc.ifc_len; ) {
114 char *ifname;
115 struct ifreq *ifr;
117 ifr = (struct ifreq *)ptr;
119 #ifdef HAVE_SOCKADDR_LEN
120 if (ifr->ifr_addr.sa_len > sizeof(struct sockaddr)) {
121 ptr += sizeof(ifr->ifr_name) + ifr->ifr_addr.sa_len;
122 } else {
123 ptr += sizeof(ifr->ifr_name) + sizeof(struct sockaddr);
125 #else
126 ptr += sizeof(struct ifreq);
127 #endif
129 if (ifr->ifr_addr.sa_family != addr->sa.sa_family) {
130 continue;
133 switch (addr->sa.sa_family) {
134 case AF_INET:
137 if (memcmp(&addr->ip.sin_addr, &((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr, sizeof(addr->ip.sin_addr))) {
138 continue;
140 break;
141 case AF_INET6:
142 if (memcmp(&addr->ip6.sin6_addr, &((struct sockaddr_in6 *)&ifr->ifr_addr)->sin6_addr, sizeof(addr->ip6.sin6_addr))) {
143 continue;
145 break;
148 ifname = strdup(ifr->ifr_name);
149 free(ifc.ifc_buf);
150 close(s);
151 return ifname;
155 free(ifc.ifc_buf);
156 close(s);
158 return NULL;