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#include <netdb.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include "dat.h"
#include "sd-daemon.h"
int
make_server_socket(char *host, char *port)
{
int fd = -1, flags, r;
struct linger linger = {0, 0};
struct addrinfo *airoot, *ai, hints;
/* See if we got a listen fd from systemd. If so, all socket options etc
* are already set, so we check that the fd is a TCP listen socket and
* return. */
r = sd_listen_fds(1);
if (r < 0) {
return twarn("sd_listen_fds"), -1;
}
if (r > 0) {
if (r > 1) {
twarnx("inherited more than one listen socket;"
" ignoring all but the first");
r = 1;
}
fd = SD_LISTEN_FDS_START;
r = sd_is_socket_inet(fd, 0, SOCK_STREAM, 1, 0);
if (r < 0) {
errno = -r;
twarn("sd_is_socket_inet");
return -1;
}
if (!r) {
twarnx("inherited fd is not a TCP listen socket");
return -1;
}
return fd;
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
r = getaddrinfo(host, port, &hints, &airoot);
if (r == -1)
return twarn("getaddrinfo()"), -1;
for(ai = airoot; ai; ai = ai->ai_next) {
fd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (fd == -1) {
twarn("socket()");
continue;
}
flags = fcntl(fd, F_GETFL, 0);
if (flags < 0) {
twarn("getting flags");
close(fd);
continue;
}
r = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
if (r == -1) {
twarn("setting O_NONBLOCK");
close(fd);
continue;
}
flags = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &flags, sizeof flags);
setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &flags, sizeof flags);
setsockopt(fd, SOL_SOCKET, SO_LINGER, &linger, sizeof linger);
setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &flags, sizeof flags);
r = bind(fd, ai->ai_addr, ai->ai_addrlen);
if (r == -1) {
twarn("bind()");
close(fd);
continue;
}
r = listen(fd, 1024);
if (r == -1) {
twarn("listen()");
close(fd);
continue;
}
break;
}
freeaddrinfo(airoot);
if(ai == NULL)
fd = -1;
return fd;
}