/* 464xlatcfg.c
*
* Copyright (c) 2015 Steven Barth <cyrus@openwrt.org>
+ * Copyright (c) 2017 Hans Dedecker <dedeckeh@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
{
char buf[INET6_ADDRSTRLEN], prefix[INET6_ADDRSTRLEN + 4];
int pid;
-
+
if (argc <= 1) {
fprintf(stderr, "Usage: %s <name> [ifname] [ipv6prefix] [ipv4addr] [ipv6addr]\n", argv[0]);
return 1;
}
-
+
snprintf(buf, sizeof(buf), "/var/run/%s.pid", argv[1]);
FILE *fp = fopen(buf, "r");
if (fp) {
- fscanf(fp, "%d", &pid);
- kill(pid, SIGTERM);
+ if (fscanf(fp, "%d", &pid) == 1)
+ kill(pid, SIGTERM);
+
unlink(buf);
fclose(fp);
}
-
+
if (!argv[2])
return 0;
-
+
if (!argv[3] || !argv[4] || !(fp = fopen(buf, "wx")))
return 1;
- signal(SIGTERM, sighandler);
+ signal(SIGTERM, SIG_DFL);
+ setvbuf(fp, NULL, _IOLBF, 0);
+ fprintf(fp, "%d\n", getpid());
prefix[sizeof(prefix) - 1] = 0;
strncpy(prefix, argv[3], sizeof(prefix) - 1);
strcat(prefix, "/96");
freeaddrinfo(res);
}
-
- struct sockaddr_in6 saddr = {.sin6_family = AF_INET6, .sin6_addr = {{{0x20, 0x01, 0x0d, 0xb8}}}};
- socklen_t saddrlen = sizeof(saddr);
- int sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
- struct icmp6_filter filt;
- ICMP6_FILTER_SETBLOCKALL(&filt);
- setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt, sizeof(filt));
- setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, argv[2], strlen(argv[2]));
- if (connect(sock, (struct sockaddr*)&saddr, sizeof(saddr)) ||
- getsockname(sock, (struct sockaddr*)&saddr, &saddrlen))
- return 3;
-
+
+ int i = 0;
+ int sock;
+ struct sockaddr_in6 saddr;
+
+ do {
+ socklen_t saddrlen = sizeof(saddr);
+ struct icmp6_filter filt;
+
+ sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
+ ICMP6_FILTER_SETBLOCKALL(&filt);
+ setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt, sizeof(filt));
+ setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, argv[2], strlen(argv[2]));
+ memset(&saddr, 0, sizeof(saddr));
+ saddr.sin6_family = AF_INET6;
+ saddr.sin6_addr.s6_addr32[0] = htonl(0x2001);
+ saddr.sin6_addr.s6_addr32[1] = htonl(0xdb8);
+ if (connect(sock, (struct sockaddr*)&saddr, sizeof(saddr)) ||
+ getsockname(sock, (struct sockaddr*)&saddr, &saddrlen))
+ return 3;
+
+ if (!IN6_IS_ADDR_LINKLOCAL(&saddr.sin6_addr) || argv[5])
+ break;
+
+ close(sock);
+ sleep(3);
+ i++;
+ } while (i < 3);
+
struct ipv6_mreq mreq = {saddr.sin6_addr, if_nametoindex(argv[2])};
if (!argv[5]) {
+ if (IN6_IS_ADDR_LINKLOCAL(&mreq.ipv6mr_multiaddr))
+ return 5;
+
srandom(mreq.ipv6mr_multiaddr.s6_addr32[0] ^ mreq.ipv6mr_multiaddr.s6_addr32[1] ^
mreq.ipv6mr_multiaddr.s6_addr32[2] ^ mreq.ipv6mr_multiaddr.s6_addr32[3]);
mreq.ipv6mr_multiaddr.s6_addr32[2] = random();
} else if (inet_pton(AF_INET6, argv[5], &mreq.ipv6mr_multiaddr) != 1) {
return 1;
}
-
+
if (setsockopt(sock, SOL_IPV6, IPV6_JOIN_ANYCAST, &mreq, sizeof(mreq)))
return 3;
-
+
inet_ntop(AF_INET6, &mreq.ipv6mr_multiaddr, buf, sizeof(buf));
fputs(buf, stdout);
fputc('\n', stdout);
fflush(stdout);
-
+
FILE *nat46 = fopen("/proc/net/nat46/control", "w");
if (!nat46 || fprintf(nat46, "add %s\nconfig %s local.style NONE local.v4 %s/32 local.v6 %s/128 "
"remote.style RFC6052 remote.v6 %s\n", argv[1], argv[1], argv[4], buf, prefix) < 0 ||
fclose(nat46))
return 4;
-
+
if (!(pid = fork())) {
fclose(fp);
fclose(stdin);
fclose(stderr);
chdir("/");
setsid();
+ signal(SIGTERM, sighandler);
pause();
nat46 = fopen("/proc/net/nat46/control", "w");
fclose(nat46);
}
} else {
+ rewind(fp);
fprintf(fp, "%d\n", pid);
}
-
+
return 0;
}