Alawn/shadowsocks-libev
1
0
Fork 0
mirror of https://github.com/shadowsocks/shadowsocks-libev.git synced 2026-10-29 04:03:45 +00:00
Code Releases Activity

Dual mode IPv4/IPv6 stack support

Browse Source 
Listen on all IP address (ipv4 and ipv6 dual mode) in single bind by default if not specify '-s'
Create an IPv6 server socket that can also accept IPv4 connections. To do so, create a regular IPv6 socket, turn off the socket option IPV6_V6ONLY, bind it to the "any" address, and start receiving. IPv4 addresses will be presented as IPv6 addresses, in the IPv4-mapped format.
This commit is contained in:
KrazyIvan
2015-01-21 23:46:03 +08:00
parent 77d3ecabdd
commit 70f17645de
1 changed files with 35 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/server.c
+35 -4
View File
@@ -147,12 +147,14 @@ int setinterface(int socket_fd, const char * interface_name)
int create_and_bind(const char *host, const char *port)
{
struct addrinfo hints;
struct addrinfo *result, *rp;
struct addrinfo *result, *rp, *ipv4v6bindall;
int s, listen_sock;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC; /* Return IPv4 and IPv6 choices */
hints.ai_socktype = SOCK_STREAM; /* We want a TCP socket */
hints.ai_flags = AI_ALL|AI_V4MAPPED|AI_PASSIVE|AI_ADDRCONFIG; /* For wildcard IP address */
hints.ai_protocol = IPPROTO_TCP;
s = getaddrinfo(host, port, &hints, &result);
if (s != 0) {
@@ -160,7 +162,29 @@ int create_and_bind(const char *host, const char *port)
return -1;
}
for (rp = result; rp != NULL; rp = rp->ai_next) {
rp = result;
/*
On Linux, with net.ipv6.bindv6only = 0 (the default), getaddrinfo(NULL) with
AI_PASSIVE returns 0.0.0.0 and :: (in this order). AI_PASSIVE was meant to
return a list of addresses to listen on, but it is impossible to listen on
0.0.0.0 and :: at the same time, if :: implies dualstack mode.
*/
if (!host) {
ipv4v6bindall = result;
/* Loop over all address infos found until a IPV6 address is found. */
while (ipv4v6bindall) {
if (ipv4v6bindall->ai_family == AF_INET6) {
rp = ipv4v6bindall; /* Take first IPV6 address available */
break;
}
ipv4v6bindall= ipv4v6bindall->ai_next; /* Get next address info, if any */
}
}
for (/*rp = result*/; rp != NULL; rp = rp->ai_next) {
listen_sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (listen_sock == -1) {
continue;
@@ -168,7 +192,11 @@ int create_and_bind(const char *host, const char *port)
int opt = 1;
setsockopt(listen_sock, IPPROTO_IPV6, IPV6_V6ONLY, &opt, sizeof(opt));
if (rp->ai_family == AF_INET6) {
int ipv6only = 0;
if (host) ipv6only = 1;
setsockopt(listen_sock, IPPROTO_IPV6, IPV6_V6ONLY, &ipv6only, sizeof(ipv6only));
}
setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
#ifdef SO_NOSIGPIPE
@@ -1104,6 +1132,10 @@ int main(int argc, char **argv)
}
}
if (server_num == 0) {
server_host[server_num++]=NULL;
}
if (server_num == 0 || server_port == NULL || password == NULL) {
usage();
exit(EXIT_FAILURE);
@@ -1244,4 +1276,3 @@ int main(int argc, char **argv)
return 0;
}