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| | /*
* Copyright (C) 2012-2013, Eric Wong <normalperson@yhbt.net>
* License: GPLv3 or later (see COPYING for details)
*/
#include "cmogstored.h"
static Hash_table *listeners; /* yes, we'll scale to 10K listen sockets, L10K! */
struct listener {
union mog_sockaddr msa;
socklen_t len;
int fd;
};
static bool listener_cmp(const void *a, const void *b)
{
const struct listener *la = a;
const struct listener *lb = b;
return (la->len == lb->len) &&
(memcmp(&la->msa, &lb->msa, lb->len) == 0);
}
static size_t listener_hash(const void *x, size_t tablesize)
{
const struct listener *l = x;
size_t value = 0;
socklen_t i;
for (i = 0; i < l->len; i++)
value = (value * 31 + l->msa.bytes[i]) % tablesize;
return value;
}
static void register_listen_fd(int fd)
{
struct listener tmp;
struct listener *ins;
struct mog_ni ni;
struct mog_packaddr mpa;
struct sockaddr *sa = &tmp.msa.sa;
tmp.len = (socklen_t)sizeof(tmp.msa);
if (getsockname(fd, sa, &tmp.len) != 0)
die_errno("getsockname(fd=%d) failed", fd);
if (sa->sa_family != AF_INET && sa->sa_family != AF_INET6)
die("invalid address family=%d (not AF_INET/AF_INET6)",
(int)sa->sa_family);
mog_packaddr_init(&mpa, &tmp.msa, tmp.len);
mog_nameinfo(&mpa, &ni);
syslog(LOG_INFO, "inherited %s%s on fd=%d", ni.ni_host, ni.ni_serv, fd);
ins = xmalloc(sizeof(*ins));
*ins = tmp;
ins->fd = fd;
switch (hash_insert_if_absent(listeners, ins, NULL)) {
case 0:
die("duplicate listener %s%s on fd=%d",
ni.ni_host, ni.ni_serv, fd);
break;
case 1: /* success */
return;
default:
mog_oom();
}
}
static void listeners_cleanup(void)
{
if (!listeners)
return;
hash_free(listeners);
listeners = NULL;
}
static bool listener_close_each(void *_l, void *unused)
{
struct listener *l = _l;
syslog(LOG_INFO, "closing unused inherited fd=%d", l->fd);
mog_close(l->fd);
l->fd = -1;
return true;
}
/* close all inherited listeners we do not need */
void mog_inherit_cleanup(void)
{
if (!listeners)
return;
hash_do_for_each(listeners, listener_close_each, NULL);
listeners_cleanup();
}
/* returns the FD belonging to the address if it was inherited */
int mog_inherit_get(struct sockaddr *addr, socklen_t len)
{
struct listener l;
struct listener *in;
int fd = -1;
if (!listeners)
return fd;
l.len = len;
memcpy(&l.msa.bytes, addr, len);
in = hash_delete(listeners, &l);
if (in) {
fd = in->fd;
free(in);
CHECK(int, 0, mog_set_cloexec(fd, true));
}
return fd;
}
void mog_inherit_init(void)
{
char *orig = getenv("CMOGSTORED_FD");
char *fds;
char *tip;
char *end;
unsigned long fd;
unsigned endbyte;
if (orig == NULL)
return;
listeners = hash_initialize(3, NULL, listener_hash, listener_cmp, free);
mog_oom_if_null(listeners);
atexit(listeners_cleanup);
fds = xstrdup(orig);
tip = fds;
for (;;) {
errno = 0;
fd = strtoul(tip, &end, 10);
if (errno == 0) {
if (fd > INT_MAX)
die("inherited fd=%lu is too large", fd);
register_listen_fd((int)fd);
} else {
die_errno("strtuol failed to parse: %s", tip);
}
/* the end (or error) */
endbyte = *end;
if (endbyte != ',')
break;
tip = end + 1; /* more FDs to parse */
}
free(fds);
if (endbyte != '\0')
die("CMOGSTORED_FD contained invalid byte: %u", endbyte);
}
|