lighttpd 1.4.x https://www.lighttpd.net/
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

536 lines
16 KiB

#include "first.h"
#include "network.h"
#include "base.h"
#include "fdevent.h"
#include "log.h"
#include "connections.h"
#include "configfile.h"
#include "sock_addr.h"
#include "network_write.h"
#include "sys-socket.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
void
network_accept_tcp_nagle_disable (const int fd)
{
static int noinherit_tcpnodelay = -1;
int opt;
if (!noinherit_tcpnodelay) /* TCP_NODELAY inherited from listen socket */
return;
if (noinherit_tcpnodelay < 0) {
socklen_t optlen = sizeof(opt);
if (0 == getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen)) {
noinherit_tcpnodelay = !opt;
if (opt) /* TCP_NODELAY inherited from listen socket */
return;
}
}
opt = 1;
(void)setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
}
static handler_t network_server_handle_fdevent(server *srv, void *context, int revents) {
server_socket *srv_socket = (server_socket *)context;
connection *con;
int loops = 0;
UNUSED(context);
if (0 == (revents & FDEVENT_IN)) {
log_error_write(srv, __FILE__, __LINE__, "sdd",
"strange event for server socket",
srv_socket->fd,
revents);
return HANDLER_ERROR;
}
/* accept()s at most 100 connections directly
*
* we jump out after 100 to give the waiting connections a chance */
for (loops = 0; loops < 100 && NULL != (con = connection_accept(srv, srv_socket)); loops++) {
connection_state_machine(srv, con);
}
return HANDLER_GO_ON;
}
static void network_host_normalize_addr_str(buffer *host, sock_addr *addr) {
buffer_clear(host);
sock_addr_stringify_append_buffer(host, addr);
}
static int network_host_parse_addr(server *srv, sock_addr *addr, socklen_t *addr_len, buffer *host, int use_ipv6) {
char *h;
char *colon = NULL;
const char *chost;
sa_family_t family = use_ipv6 ? AF_INET6 : AF_INET;
unsigned int port = srv->srvconf.port;
if (buffer_string_is_empty(host)) {
log_error_write(srv, __FILE__, __LINE__, "s", "value of $SERVER[\"socket\"] must not be empty");
return -1;
}
h = host->ptr;
if (h[0] == '/') {
#ifdef HAVE_SYS_UN_H
return (1 == sock_addr_from_str_hints(srv,addr,addr_len,h,AF_UNIX,0))
? 0
: -1;
#else
log_error_write(srv, __FILE__, __LINE__, "s",
"ERROR: Unix Domain sockets are not supported.");
return -1;
#endif
}
buffer_copy_buffer(srv->tmp_buf, host);
h = srv->tmp_buf->ptr;
if (h[0] == '[') {
family = AF_INET6;
if ((h = strchr(h, ']'))) {
*h++ = '\0';
if (*h == ':') colon = h;
} /*(else should not happen; validated in configparser.y)*/
h = srv->tmp_buf->ptr+1;
}
else {
colon = strrchr(h, ':');
}
if (colon) {
*colon++ = '\0';
port = strtol(colon, NULL, 10);
if (port == 0 || port > 65535) {
log_error_write(srv, __FILE__, __LINE__, "sd",
"port not set or out of range:", port);
return -1;
}
}
chost = *h ? h : family == AF_INET ? "0.0.0.0" : "::";
if (1 != sock_addr_from_str_hints(srv,addr,addr_len,chost,family,port)) {
return -1;
}
return 0;
}
static void network_srv_sockets_append(server *srv, server_socket *srv_socket) {
if (srv->srv_sockets.used == srv->srv_sockets.size) {
srv->srv_sockets.size += 4;
srv->srv_sockets.ptr = realloc(srv->srv_sockets.ptr, srv->srv_sockets.size * sizeof(server_socket*));
force_assert(NULL != srv->srv_sockets.ptr);
}
srv->srv_sockets.ptr[srv->srv_sockets.used++] = srv_socket;
}
static int network_server_init(server *srv, buffer *host_token, size_t sidx, int stdin_fd) {
server_socket *srv_socket;
const char *host;
specific_config *s = srv->config_storage[sidx];
socklen_t addr_len = sizeof(sock_addr);
sock_addr addr;
int family = 0;
int set_v6only = 0;
if (buffer_string_is_empty(host_token)) {
log_error_write(srv, __FILE__, __LINE__, "s", "value of $SERVER[\"socket\"] must not be empty");
return -1;
}
/* check if we already know this socket, and if yes, don't init it
* (optimization: check strings here to filter out exact matches;
* binary addresses are matched further below) */
for (size_t i = 0; i < srv->srv_sockets.used; ++i) {
if (buffer_is_equal(srv->srv_sockets.ptr[i]->srv_token, host_token)) {
buffer_copy_buffer(host_token, srv->srv_sockets.ptr[i]->srv_token);
return 0;
}
}
host = host_token->ptr;
if ((s->use_ipv6 && (*host == '\0' || *host == ':')) || (host[0] == '[' && host[1] == ']')) {
log_error_write(srv, __FILE__, __LINE__, "s", "warning: please use server.use-ipv6 only for hostnames, not without server.bind / empty address; your config will break if the kernel default for IPV6_V6ONLY changes");
}
if (*host == '[') s->use_ipv6 = 1;
memset(&addr, 0, sizeof(addr));
if (-1 != stdin_fd) {
if (-1 == getsockname(stdin_fd, (struct sockaddr *)&addr, &addr_len)) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"getsockname()", strerror(errno));
return -1;
}
} else if (0 != network_host_parse_addr(srv, &addr, &addr_len, host_token, s->use_ipv6)) {
return -1;
}
family = sock_addr_get_family(&addr);
#ifdef HAVE_IPV6
if (*host != '\0' && AF_INET6 == family) {
if (s->set_v6only) {
set_v6only = 1;
} else {
log_error_write(srv, __FILE__, __LINE__, "s", "warning: server.set-v6only will be removed soon, update your config to have different sockets for ipv4 and ipv6");
}
}
#endif
network_host_normalize_addr_str(host_token, &addr);
host = host_token->ptr;
if (srv->srvconf.preflight_check) {
return 0;
}
/* check if we already know this socket (after potential DNS resolution), and if yes, don't init it */
for (size_t i = 0; i < srv->srv_sockets.used; ++i) {
if (0 == memcmp(&srv->srv_sockets.ptr[i]->addr, &addr, sizeof(addr))) {
return 0;
}
}
srv_socket = calloc(1, sizeof(*srv_socket));
force_assert(NULL != srv_socket);
memcpy(&srv_socket->addr, &addr, addr_len);
srv_socket->fd = -1;
srv_socket->fde_ndx = -1;
srv_socket->sidx = sidx;
srv_socket->is_ssl = s->ssl_enabled;
srv_socket->srv_token = buffer_init_buffer(host_token);
network_srv_sockets_append(srv, srv_socket);
if (srv->sockets_disabled) { /* lighttpd -1 (one-shot mode) */
return 0;
}
if (srv->srvconf.systemd_socket_activation) {
for (size_t i = 0; i < srv->srv_sockets_inherited.used; ++i) {
if (0 != memcmp(&srv->srv_sockets_inherited.ptr[i]->addr, &srv_socket->addr, addr_len)) continue;
if ((unsigned short)~0u == srv->srv_sockets_inherited.ptr[i]->sidx) {
srv->srv_sockets_inherited.ptr[i]->sidx = sidx;
}
stdin_fd = srv->srv_sockets_inherited.ptr[i]->fd;
break;
}
}
if (-1 != stdin_fd) {
srv_socket->fd = stdin_fd;
if (-1 == fdevent_fcntl_set_nb_cloexec(srv->ev, stdin_fd)) {
log_error_write(srv, __FILE__, __LINE__, "ss", "fcntl:", strerror(errno));
return -1;
}
} else
#ifdef HAVE_SYS_UN_H
if (AF_UNIX == family) {
/* check if the socket exists and try to connect to it. */
force_assert(host); /*(static analysis hint)*/
if (-1 == (srv_socket->fd = fdevent_socket_cloexec(AF_UNIX, SOCK_STREAM, 0))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "socket failed:", strerror(errno));
return -1;
}
if (0 == connect(srv_socket->fd, (struct sockaddr *) &(srv_socket->addr), addr_len)) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"server socket is still in use:",
host);
return -1;
}
/* connect failed */
switch(errno) {
case ECONNREFUSED:
unlink(host);
break;
case ENOENT:
break;
default:
log_error_write(srv, __FILE__, __LINE__, "sds",
"testing socket failed:",
host, strerror(errno));
return -1;
}
fdevent_fcntl_set_nb(srv->ev, srv_socket->fd);
} else
#endif
{
if (-1 == (srv_socket->fd = fdevent_socket_nb_cloexec(family, SOCK_STREAM, IPPROTO_TCP))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "socket failed:", strerror(errno));
return -1;
}
}
#ifdef HAVE_IPV6
if (set_v6only && -1 == stdin_fd) {
int val = 1;
if (-1 == setsockopt(srv_socket->fd, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "setsockopt(IPV6_V6ONLY) failed:", strerror(errno));
return -1;
}
}
#endif
/* */
srv->cur_fds = srv_socket->fd;
if (fdevent_set_so_reuseaddr(srv_socket->fd, 1) < 0) {
log_error_write(srv, __FILE__, __LINE__, "ss", "setsockopt(SO_REUSEADDR) failed:", strerror(errno));
return -1;
}
if (family != AF_UNIX) {
if (fdevent_set_tcp_nodelay(srv_socket->fd, 1) < 0) {
log_error_write(srv, __FILE__, __LINE__, "ss", "setsockopt(TCP_NODELAY) failed:", strerror(errno));
return -1;
}
}
if (-1 != stdin_fd) { } else
if (0 != bind(srv_socket->fd, (struct sockaddr *) &(srv_socket->addr), addr_len)) {
log_error_write(srv, __FILE__, __LINE__, "sss",
"can't bind to socket:", host, strerror(errno));
return -1;
}
if (-1 != stdin_fd) { } else
if (AF_UNIX == family && !buffer_string_is_empty(s->socket_perms)) {
mode_t m = 0;
for (char *str = s->socket_perms->ptr; *str; ++str) {
m <<= 3;
m |= (*str - '0');
}
if (0 != m && -1 == chmod(host, m)) {
log_error_write(srv, __FILE__, __LINE__, "sssbss", "chmod(\"", host, "\", ", s->socket_perms, "):", strerror(errno));
}
}
if (-1 != stdin_fd) { } else
if (-1 == listen(srv_socket->fd, s->listen_backlog)) {
log_error_write(srv, __FILE__, __LINE__, "ss", "listen failed: ", strerror(errno));
return -1;
}
if (s->ssl_enabled) {
#ifdef TCP_DEFER_ACCEPT
} else if (s->defer_accept) {
int v = s->defer_accept;
if (-1 == setsockopt(srv_socket->fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &v, sizeof(v))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "can't set TCP_DEFER_ACCEPT: ", strerror(errno));
}
#endif
#if defined(__FreeBSD__) || defined(__NetBSD__) \
|| defined(__OpenBSD__) || defined(__DragonFly__)
} else if (!buffer_is_empty(s->bsd_accept_filter)
&& (buffer_is_equal_string(s->bsd_accept_filter, CONST_STR_LEN("httpready"))
|| buffer_is_equal_string(s->bsd_accept_filter, CONST_STR_LEN("dataready")))) {
#ifdef SO_ACCEPTFILTER
/* FreeBSD accf_http filter */
struct accept_filter_arg afa;
memset(&afa, 0, sizeof(afa));
strncpy(afa.af_name, s->bsd_accept_filter->ptr, sizeof(afa.af_name));
if (setsockopt(srv_socket->fd, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa)) < 0) {
if (errno != ENOENT) {
log_error_write(srv, __FILE__, __LINE__, "SBss", "can't set accept-filter '", s->bsd_accept_filter, "':", strerror(errno));
}
}
#endif
#endif
}
return 0;
}
int network_close(server *srv) {
size_t i;
for (i = 0; i < srv->srv_sockets.used; i++) {
server_socket *srv_socket = srv->srv_sockets.ptr[i];
if (srv_socket->fd != -1) {
network_unregister_sock(srv, srv_socket);
close(srv_socket->fd);
}
buffer_free(srv_socket->srv_token);
free(srv_socket);
}
free(srv->srv_sockets.ptr);
srv->srv_sockets.ptr = NULL;
srv->srv_sockets.used = 0;
srv->srv_sockets.size = 0;
for (i = 0; i < srv->srv_sockets_inherited.used; i++) {
server_socket *srv_socket = srv->srv_sockets_inherited.ptr[i];
if (srv_socket->fd != -1 && srv_socket->sidx != (unsigned short)~0u) {
close(srv_socket->fd);
}
buffer_free(srv_socket->srv_token);
free(srv_socket);
}
free(srv->srv_sockets_inherited.ptr);
srv->srv_sockets_inherited.ptr = NULL;
srv->srv_sockets_inherited.used = 0;
srv->srv_sockets_inherited.size = 0;
return 0;
}
static int network_socket_activation_nfds(server *srv, int nfds) {
buffer *host = buffer_init();
socklen_t addr_len;
sock_addr addr;
int rc = 0;
nfds += 3; /* #define SD_LISTEN_FDS_START 3 */
for (int fd = 3; fd < nfds; ++fd) {
addr_len = sizeof(sock_addr);
if (-1 == (rc = getsockname(fd, (struct sockaddr *)&addr, &addr_len))) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"socket activation getsockname()", strerror(errno));
break;
}
network_host_normalize_addr_str(host, &addr);
rc = network_server_init(srv, host, 0, fd);
if (0 != rc) break;
srv->srv_sockets.ptr[srv->srv_sockets.used-1]->sidx = (unsigned short)~0u;
}
buffer_free(host);
memcpy(&srv->srv_sockets_inherited, &srv->srv_sockets, sizeof(server_socket_array));
memset(&srv->srv_sockets, 0, sizeof(server_socket_array));
return rc;
}
static int network_socket_activation_from_env(server *srv) {
char *listen_pid = getenv("LISTEN_PID");
char *listen_fds = getenv("LISTEN_FDS");
pid_t lpid = listen_pid ? (pid_t)strtoul(listen_pid,NULL,10) : 0;
int nfds = listen_fds ? atoi(listen_fds) : 0;
int rc = (lpid == getpid() && nfds > 0)
? network_socket_activation_nfds(srv, nfds)
: 0;
unsetenv("LISTEN_PID");
unsetenv("LISTEN_FDS");
unsetenv("LISTEN_FDNAMES");
/*(upon graceful restart, unsetenv will result in no-op above)*/
return rc;
}
int network_init(server *srv, int stdin_fd) {
#ifdef __WIN32
WSADATA wsaData;
WORD wVersionRequested = MAKEWORD(2, 2);
if (0 != WSAStartup(wVersionRequested, &wsaData)) {
/* Tell the user that we could not find a usable WinSock DLL */
return -1;
}
#endif
if (0 != network_write_init(srv)) return -1;
if (srv->srvconf.systemd_socket_activation) {
for (size_t i = 0; i < srv->srv_sockets_inherited.used; ++i) {
srv->srv_sockets_inherited.ptr[i]->sidx = (unsigned short)~0u;
}
if (0 != network_socket_activation_from_env(srv)) return -1;
if (0 == srv->srv_sockets_inherited.used) {
srv->srvconf.systemd_socket_activation = 0;
}
}
/* process srv->srvconf.bindhost
* (skip if systemd socket activation is enabled and bindhost is empty; do not additionally listen on "*") */
if (!srv->srvconf.systemd_socket_activation || !buffer_string_is_empty(srv->srvconf.bindhost)) {
int rc;
buffer *b = buffer_init();
buffer_copy_buffer(b, srv->srvconf.bindhost);
if (b->ptr[0] != '/') { /*(skip adding port if unix socket path)*/
buffer_append_string_len(b, CONST_STR_LEN(":"));
buffer_append_int(b, srv->srvconf.port);
}
rc = (-1 == stdin_fd || 0 == srv->srv_sockets.used)
? network_server_init(srv, b, 0, stdin_fd)
: close(stdin_fd);/*(graceful restart listening to "/dev/stdin")*/
buffer_free(b);
if (0 != rc) return -1;
}
/* check for $SERVER["socket"] */
for (size_t i = 1; i < srv->config_context->used; ++i) {
data_config *dc = (data_config *)srv->config_context->data[i];
/* not our stage */
if (COMP_SERVER_SOCKET != dc->comp) continue;
if (dc->cond == CONFIG_COND_NE) {
socklen_t addr_len = sizeof(sock_addr);
sock_addr addr;
if (0 != network_host_parse_addr(srv, &addr, &addr_len, dc->string, srv->config_storage[i]->use_ipv6)) {
return -1;
}
network_host_normalize_addr_str(dc->string, &addr);
continue;
}
if (dc->cond != CONFIG_COND_EQ) continue;
if (0 != network_server_init(srv, dc->string, i, -1)) return -1;
}
if (srv->srvconf.systemd_socket_activation) {
/* activate any inherited sockets not explicitly listed in config file */
server_socket *srv_socket;
for (size_t i = 0; i < srv->srv_sockets_inherited.used; ++i) {
if ((unsigned short)~0u != srv->srv_sockets_inherited.ptr[i]->sidx) continue;
srv->srv_sockets_inherited.ptr[i]->sidx = 0;
srv_socket = calloc(1, sizeof(server_socket));
force_assert(NULL != srv_socket);
memcpy(srv_socket, srv->srv_sockets_inherited.ptr[i], sizeof(server_socket));
network_srv_sockets_append(srv, srv_socket);
}
}
return 0;
}
void network_unregister_sock(server *srv, server_socket *srv_socket) {
if (-1 == srv_socket->fd || -1 == srv_socket->fde_ndx) return;
fdevent_event_del(srv->ev, &srv_socket->fde_ndx, srv_socket->fd);
fdevent_unregister(srv->ev, srv_socket->fd);
}
int network_register_fdevents(server *srv) {
size_t i;
if (-1 == fdevent_reset(srv->ev)) {
return -1;
}
if (srv->sockets_disabled) return 0; /* lighttpd -1 (one-shot mode) */
/* register fdevents after reset */
for (i = 0; i < srv->srv_sockets.used; i++) {
server_socket *srv_socket = srv->srv_sockets.ptr[i];
fdevent_register(srv->ev, srv_socket->fd, network_server_handle_fdevent, srv_socket);
fdevent_event_set(srv->ev, &(srv_socket->fde_ndx), srv_socket->fd, FDEVENT_IN);
}
return 0;
}