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sockets.c
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sockets.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include "constants.h"
#include "log.h"
#include "net.h"
#include "maps.h"
#include "params.h" // verbose, do_specific_proto
#include "protocols.h"
#include "random.h"
#include "shm.h"
#include "trinity.h"
#include "utils.h"
unsigned int nr_sockets = 0;
static const char *cachefilename="trinity.socketcache";
#define MAX_PER_DOMAIN 5
#define MAX_TRIES_PER_DOMAIN 10
static int open_socket(unsigned int domain, unsigned int type, unsigned int protocol)
{
int fd;
__unused__ int ret;
struct sockaddr *sa = NULL;
socklen_t salen;
struct sockopt so = { 0, 0, 0, 0 };
fd = socket(domain, type, protocol);
if (fd == -1)
return fd;
shm->sockets[nr_sockets].fd = fd;
shm->sockets[nr_sockets].triplet.family = domain;
shm->sockets[nr_sockets].triplet.type = type;
shm->sockets[nr_sockets].triplet.protocol = protocol;
output(2, "fd[%i] = domain:%i (%s) type:0x%x protocol:%i\n",
fd, domain, get_proto_name(domain), type, protocol);
/* Set some random socket options. */
sso_socket(&shm->sockets[nr_sockets].triplet, &so, fd);
nr_sockets++;
/* Sometimes, listen on created sockets. */
if (rand_bool()) {
/* fake a sockaddr. */
generate_sockaddr((struct sockaddr **) &sa, (socklen_t *) &salen, domain);
ret = bind(fd, sa, salen);
/* if (ret == -1)
debugf("bind: %s\n", strerror(errno));
else
debugf("bind: success!\n");
*/
ret = listen(fd, (rand() % 2) + 1);
/* if (ret == -1)
debugf("listen: %s\n", strerror(errno));
else
debugf("listen: success!\n");
*/
}
/* If we didn't have a function for this sockaddr type, we would
* have returned page_rand, so don't free() it or we segv. */
if (sa == (struct sockaddr *) page_rand)
return fd;
if (sa != NULL)
free(sa);
return fd;
}
static void lock_cachefile(int cachefile, int type)
{
struct flock fl = {
.l_len = 0,
.l_start = 0,
.l_whence = SEEK_SET,
};
fl.l_pid = getpid();
fl.l_type = type;
if (verbose)
output(2, "waiting on lock for cachefile\n");
if (fcntl(cachefile, F_SETLKW, &fl) == -1) {
perror("fcntl F_SETLKW");
exit(1);
}
if (verbose)
output(2, "took lock for cachefile\n");
}
static void unlock_cachefile(int cachefile)
{
struct flock fl = {
.l_len = 0,
.l_start = 0,
.l_whence = SEEK_SET,
};
fl.l_pid = getpid();
fl.l_type = F_UNLCK;
if (fcntl(cachefile, F_SETLK, &fl) == -1) {
perror("fcntl F_UNLCK F_SETLK ");
exit(1);
}
if (verbose)
output(2, "dropped lock for cachefile\n");
}
static void generate_sockets(void)
{
int fd, n;
int cachefile;
unsigned int nr_to_create = NR_SOCKET_FDS;
unsigned int buffer[3];
cachefile = creat(cachefilename, S_IWUSR|S_IRUSR);
if (cachefile < 0) {
outputerr("Couldn't open cachefile for writing! (%s)\n",
strerror(errno));
exit(EXIT_FAILURE);
}
lock_cachefile(cachefile, F_WRLCK);
/*
* Don't loop forever if all protos all are disabled.
*/
if (!do_specific_proto) {
for (n = 0; n < (int)ARRAY_SIZE(no_protos); n++) {
if (!no_protos[n])
break;
}
if (n >= (int)ARRAY_SIZE(no_protos))
nr_to_create = 0;
}
while (nr_to_create > 0) {
struct socket_triplet st;
if (shm->exit_reason != STILL_RUNNING) {
close(cachefile);
return;
}
for (st.family = 0; st.family < TRINITY_PF_MAX; st.family++) {
if (do_specific_proto == TRUE)
st.family = specific_proto;
if (get_proto_name(st.family) == NULL)
goto skip;
BUG_ON(st.family >= ARRAY_SIZE(no_protos));
if (no_protos[st.family])
goto skip;
if (sanitise_socket_triplet(&st) == -1)
rand_proto_type(&st);
fd = open_socket(st.family, st.type, st.protocol);
if (fd > -1) {
nr_to_create--;
buffer[0] = st.family;
buffer[1] = st.type;
buffer[2] = st.protocol;
n = write(cachefile, &buffer, sizeof(int) * 3);
if (n == -1) {
outputerr("something went wrong writing the cachefile!\n");
exit(EXIT_FAILURE);
}
if (nr_to_create == 0)
goto done;
} else {
//outputerr("Couldn't open family:%d (%s)\n", st.family, get_proto_name(st.family));
}
skip:
/* check for ctrl-c */
if (shm->exit_reason != STILL_RUNNING)
return;
//FIXME: If we've passed -P and we're spinning here without making progress
// then we should abort after a few hundred loops.
}
}
done:
unlock_cachefile(cachefile);
output(1, "created %d sockets\n", nr_sockets);
close(cachefile);
}
void close_sockets(void)
{
unsigned int i;
int fd;
int r = 0;
struct linger ling = { .l_onoff = FALSE, .l_linger = 0 };
for (i = 0; i < nr_sockets; i++) {
//FIXME: This is a workaround for a weird bug where we hang forevre
// waiting for bluetooth sockets when we setsockopt.
// Hopefully at some point we can remove this when someone figures out what's going on.
if (shm->sockets[i].triplet.family == PF_BLUETOOTH)
continue;
/* Grab an fd, and nuke it before someone else uses it. */
fd = shm->sockets[i].fd;
shm->sockets[i].fd = 0;
/* disable linger */
r = setsockopt(fd, SOL_SOCKET, SO_LINGER, &ling, sizeof(struct linger));
if (r)
perror("setsockopt");
r = shutdown(fd, SHUT_RDWR);
if (r)
perror("shutdown");
if (close(fd) != 0)
output(1, "failed to close socket [%d:%d:%d].(%s)\n",
shm->sockets[i].triplet.family,
shm->sockets[i].triplet.type,
shm->sockets[i].triplet.protocol,
strerror(errno));
}
nr_sockets = 0;
}
void open_sockets(void)
{
int cachefile;
unsigned int domain, type, protocol;
unsigned int buffer[3];
int bytesread=-1;
int fd;
cachefile = open(cachefilename, O_RDONLY);
if (cachefile < 0) {
output(1, "Couldn't find socket cachefile. Regenerating.\n");
generate_sockets();
return;
}
lock_cachefile(cachefile, F_RDLCK);
while (bytesread != 0) {
bytesread = read(cachefile, buffer, sizeof(int) * 3);
if (bytesread == 0)
break;
domain = buffer[0];
type = buffer[1];
protocol = buffer[2];
if ((do_specific_proto == TRUE && domain != specific_proto) ||
(domain < ARRAY_SIZE(no_protos) && no_protos[domain] == TRUE)) {
output(1, "ignoring socket cachefile due to specific "
"protocol request (or protocol disabled), "
"and stale data in cachefile.\n");
regenerate:
unlock_cachefile(cachefile); /* drop the reader lock. */
close(cachefile);
unlink(cachefilename);
generate_sockets();
return;
}
fd = open_socket(domain, type, protocol);
if (fd < 0) {
output(1, "Cachefile is stale. Need to regenerate.\n");
close_sockets();
goto regenerate;
}
/* check for ctrl-c */
if (shm->exit_reason != STILL_RUNNING) {
close(cachefile);
return;
}
}
if (nr_sockets < NR_SOCKET_FDS) {
output(1, "Insufficient sockets in cachefile (%d). Regenerating.\n", nr_sockets);
goto regenerate;
}
output(1, "%d sockets created based on info from socket cachefile.\n", nr_sockets);
unlock_cachefile(cachefile);
close(cachefile);
}