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/* af_unix.c
* (c) 2002 Mikulas Patocka
* This file is a part of the Links program, released under GPL
*/
#include "links.h"
#ifdef DONT_USE_AF_UNIX
int bind_to_af_unix(void)
{
return -1;
}
void af_unix_close(void)
{
}
#else
#ifdef USE_AF_UNIX
#include <sys/un.h>
#endif
static void af_unix_connection(void *);
#define ADDR_SIZE 4096
union address {
struct sockaddr s;
#ifdef USE_AF_UNIX
struct sockaddr_un sun;
#endif
struct sockaddr_in sin;
unsigned char buffer[ADDR_SIZE];
};
static union address s_unix;
static union address s_unix_acc;
static socklen_t s_unix_l;
static int s_unix_fd = -1;
static int s_unix_master = 0;
#define S2C1_HANDSHAKE_LENGTH 6
#define C2S2_HANDSHAKE_LENGTH sizeof(struct links_handshake)
#define S2C3_HANDSHAKE_LENGTH sizeof(struct links_handshake)
static struct links_handshake {
unsigned char version[30];
unsigned char system_name[32];
unsigned char system_id;
unsigned char sizeof_long;
} links_handshake;
#define HANDSHAKE_WRITE(hndl, sz) \
if ((r = hard_write(hndl, (unsigned char *)&links_handshake, sz)) != (sz))
#define HANDSHAKE_READ(hndl, sz) \
if ((r = hard_read(hndl, (unsigned char *)&received_handshake, sz)) != (sz) || memcmp(&received_handshake, &links_handshake, sz))
#ifdef USE_AF_UNIX
static int get_address(void)
{
unsigned char *path;
if (!links_home) return -1;
path = stracpy(links_home);
add_to_strn(&path, LINKS_SOCK_NAME);
s_unix_l = (unsigned char *)&s_unix.sun.sun_path - (unsigned char *)&s_unix.sun + strlen(path) + 1;
if (strlen(path) > sizeof(union address) || (size_t)s_unix_l > sizeof(union address)) {
mem_free(path);
return -1;
}
memset(&s_unix, 0, sizeof s_unix);
s_unix.sun.sun_family = AF_UNIX;
strcpy(s_unix.sun.sun_path, path);
mem_free(path);
return PF_UNIX;
}
static void unlink_unix(void)
{
int rs;
/*debug("unlink: %s", s_unix.sun.sun_path);*/
EINTRLOOP(rs, unlink(s_unix.sun.sun_path));
if (rs) {
/*perror("unlink");*/
}
}
#else
static int get_address(void)
{
memset(&s_unix, 0, sizeof s_unix);
s_unix.sin.sin_family = AF_INET;
s_unix.sin.sin_port = htons(LINKS_PORT);
s_unix.sin.sin_addr.s_addr = htonl(0x7f000001);
s_unix_l = sizeof(struct sockaddr_in);
return PF_INET;
}
static void unlink_unix(void)
{
}
#endif
static void sleep_a_little_bit(void)
{
struct timeval tv = { 0, 100000 };
fd_set dummy;
int rs;
FD_ZERO(&dummy);
EINTRLOOP(rs, select(0, &dummy, &dummy, &dummy, &tv));
}
int bind_to_af_unix(void)
{
int u = 0;
int a1 = 1;
int cnt = 0;
int af;
int r;
int rs;
struct links_handshake received_handshake;
memset(&links_handshake, 0, sizeof links_handshake);
safe_strncpy(links_handshake.version, "Links " VERSION_STRING, sizeof links_handshake.version);
safe_strncpy(links_handshake.system_name, system_name, sizeof links_handshake.system_name);
links_handshake.system_id = SYSTEM_ID;
links_handshake.sizeof_long = sizeof(long);
if ((af = get_address()) == -1) return -1;
again:
EINTRLOOP(s_unix_fd, socket(af, SOCK_STREAM, 0));
if (s_unix_fd == -1) return -1;
#if defined(SOL_SOCKET) && defined(SO_REUSEADDR)
EINTRLOOP(rs, setsockopt(s_unix_fd, SOL_SOCKET, SO_REUSEADDR, (void *)&a1, sizeof a1));
#endif
EINTRLOOP(rs, bind(s_unix_fd, &s_unix.s, s_unix_l));
if (rs) {
/*perror("");
debug("bind: %d", errno);*/
if (af == PF_INET && errno == EADDRNOTAVAIL) {
/* do not try to connect if the user has not configured loopback interface */
EINTRLOOP(rs, close(s_unix_fd));
return -1;
}
EINTRLOOP(rs, close(s_unix_fd));
EINTRLOOP(s_unix_fd, socket(af, SOCK_STREAM, 0));
if (s_unix_fd == -1) return -1;
#if defined(SOL_SOCKET) && defined(SO_REUSEADDR)
EINTRLOOP(rs, setsockopt(s_unix_fd, SOL_SOCKET, SO_REUSEADDR, (void *)&a1, sizeof a1));
#endif
EINTRLOOP(rs, connect(s_unix_fd, &s_unix.s, s_unix_l));
if (rs) {
retry:
/*perror("");
debug("connect: %d", errno);*/
if (++cnt < MAX_BIND_TRIES) {
sleep_a_little_bit();
EINTRLOOP(rs, close(s_unix_fd));
s_unix_fd = -1;
goto again;
}
EINTRLOOP(rs, close(s_unix_fd));
s_unix_fd = -1;
if (!u) {
unlink_unix();
u = 1;
goto again;
}
return -1;
}
HANDSHAKE_READ(s_unix_fd, S2C1_HANDSHAKE_LENGTH) {
if (r != S2C1_HANDSHAKE_LENGTH) goto retry;
goto close_and_fail;
}
HANDSHAKE_WRITE(s_unix_fd, C2S2_HANDSHAKE_LENGTH)
goto close_and_fail;
HANDSHAKE_READ(s_unix_fd, S2C3_HANDSHAKE_LENGTH)
goto close_and_fail;
return s_unix_fd;
}
EINTRLOOP(rs, listen(s_unix_fd, 100));
if (rs) {
error("ERROR: listen failed: %d", errno);
close_and_fail:
EINTRLOOP(rs, close(s_unix_fd));
s_unix_fd = -1;
return -1;
}
s_unix_master = 1;
set_handlers(s_unix_fd, af_unix_connection, NULL, NULL, NULL);
return -1;
}
static void af_unix_connection(void *xxx)
{
socklen_t l = s_unix_l;
int ns;
int r;
int rs;
struct links_handshake received_handshake;
memset(&s_unix_acc, 0, sizeof s_unix_acc);
EINTRLOOP(ns, accept(s_unix_fd, &s_unix_acc.s, &l));
if (ns == -1) return;
HANDSHAKE_WRITE(ns, S2C1_HANDSHAKE_LENGTH) {
EINTRLOOP(rs, close(ns));
return;
}
HANDSHAKE_READ(ns, C2S2_HANDSHAKE_LENGTH) {
sleep_a_little_bit(); /* workaround a race in previous Links version */
EINTRLOOP(rs, close(ns));
return;
}
HANDSHAKE_WRITE(ns, S2C3_HANDSHAKE_LENGTH) {
EINTRLOOP(rs, close(ns));
return;
}
init_term(ns, ns, win_func);
set_highpri();
}
void af_unix_close(void)
{
int rs;
if (s_unix_master) {
set_handlers(s_unix_fd, NULL, NULL, NULL, NULL);
}
if (s_unix_fd != -1) {
EINTRLOOP(rs, close(s_unix_fd));
s_unix_fd = -1;
}
if (s_unix_master) {
unlink_unix();
s_unix_master = 0;
}
}
#endif
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