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/* $OpenBSD: listen.c,v 1.21 2013/03/13 08:28:34 ratchov Exp $ */
/*
* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/signal.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "conf.h"
#include "listen.h"
#include "sock.h"
#include "dbg.h"
struct fileops listen_ops = {
"listen",
sizeof(struct listen),
listen_close,
NULL, /* read */
NULL, /* write */
NULL, /* start */
NULL, /* stop */
listen_nfds,
listen_pollfd,
listen_revents
};
struct listen *listen_list = NULL;
void
listen_new_un(char *path)
{
int sock, oldumask;
struct sockaddr_un sockname;
struct listen *f;
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock < 0)
err(1, "socket");
if (unlink(path) < 0 && errno != ENOENT) {
perror("unlink");
goto bad_close;
}
sockname.sun_family = AF_UNIX;
strlcpy(sockname.sun_path, path, sizeof(sockname.sun_path));
oldumask = umask(0111);
if (bind(sock, (struct sockaddr *)&sockname,
sizeof(struct sockaddr_un)) < 0) {
perror("bind");
goto bad_close;
}
umask(oldumask);
f = (struct listen *)file_new(&listen_ops, path, 1);
if (f == NULL)
goto bad_close;
f->path = strdup(path);
if (f->path == NULL)
err(1, "strdup");
f->fd = sock;
f->next = listen_list;
listen_list = f;
return;
bad_close:
close(sock);
exit(1);
}
void
listen_new_tcp(char *addr, unsigned int port)
{
char *host, serv[sizeof(unsigned int) * 3 + 1];
struct addrinfo *ailist, *ai, aihints;
struct listen *f;
int s, error, opt = 1, n = 0;
/*
* obtain a list of possible addresses for the host/port
*/
memset(&aihints, 0, sizeof(struct addrinfo));
snprintf(serv, sizeof(serv), "%u", port);
host = strcmp(addr, "-") == 0 ? NULL : addr;
aihints.ai_flags |= AI_PASSIVE;
aihints.ai_socktype = SOCK_STREAM;
aihints.ai_protocol = IPPROTO_TCP;
error = getaddrinfo(host, serv, &aihints, &ailist);
if (error)
errx(1, "%s: %s", addr, gai_strerror(error));
/*
* for each address, try create a listening socket bound on
* that address
*/
for (ai = ailist; ai != NULL; ai = ai->ai_next) {
s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (s < 0) {
perror("socket");
continue;
}
opt = 1;
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(int)) < 0) {
perror("setsockopt");
goto bad_close;
}
if (bind(s, ai->ai_addr, ai->ai_addrlen) < 0) {
perror("bind");
goto bad_close;
}
f = (struct listen *)file_new(&listen_ops, addr, 1);
if (f == NULL) {
bad_close:
close(s);
continue;
}
f->path = NULL;
f->fd = s;
f->next = listen_list;
listen_list = f;
n++;
}
freeaddrinfo(ailist);
if (n == 0)
exit(1);
}
int
listen_init(struct listen *f)
{
if (listen(f->fd, 1) < 0) {
perror("listen");
return 0;
}
return 1;
}
int
listen_nfds(struct file *f) {
return 1;
}
int
listen_pollfd(struct file *file, struct pollfd *pfd, int events)
{
struct listen *f = (struct listen *)file;
if (file_slowaccept)
return 0;
pfd->fd = f->fd;
pfd->events = POLLIN;
return 1;
}
int
listen_revents(struct file *file, struct pollfd *pfd)
{
struct listen *f = (struct listen *)file;
struct sockaddr caddr;
socklen_t caddrlen;
int sock, opt;
if (pfd->revents & POLLIN) {
caddrlen = sizeof(caddrlen);
while ((sock = accept(f->fd, &caddr, &caddrlen)) < 0) {
if (errno == EINTR)
continue;
if (errno == ENFILE || errno == EMFILE)
file_slowaccept = 1;
else if (errno != ECONNABORTED && errno != EWOULDBLOCK)
perror("accept");
return 0;
}
if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) {
perror("fcntl(sock, O_NONBLOCK)");
close(sock);
return 0;
}
if (f->path == NULL) {
opt = 1;
if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
&opt, sizeof(int)) < 0) {
perror("setsockopt");
close(sock);
return 0;
}
}
if (sock_new(&sock_ops, sock) == NULL) {
close(sock);
return 0;
}
}
return 0;
}
void
listen_close(struct file *file)
{
struct listen *f = (struct listen *)file, **pf;
if (f->path != NULL) {
unlink(f->path);
free(f->path);
}
close(f->fd);
for (pf = &listen_list; *pf != f; pf = &(*pf)->next) {
#ifdef DEBUG
if (*pf == NULL) {
dbg_puts("listen_close: not on list\n");
dbg_panic();
}
#endif
}
*pf = f->next;
}
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