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lighttpd1.4/src/server.c

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#include "server.h"
#include "buffer.h"
#include "network.h"
#include "log.h"
#include "keyvalue.h"
#include "response.h"
#include "request.h"
#include "chunk.h"
#include "http_chunk.h"
#include "fdevent.h"
#include "connections.h"
#include "stat_cache.h"
#include "plugin.h"
#include "joblist.h"
#include "network_backends.h"
#include "version.h"
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <signal.h>
#include <assert.h>
#include <locale.h>
#include <stdio.h>
#ifdef HAVE_GETOPT_H
# include <getopt.h>
#endif
#ifdef HAVE_VALGRIND_VALGRIND_H
# include <valgrind/valgrind.h>
#endif
#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
#ifdef HAVE_PWD_H
# include <grp.h>
# include <pwd.h>
#endif
#ifdef HAVE_SYS_RESOURCE_H
# include <sys/resource.h>
#endif
#ifdef HAVE_SYS_PRCTL_H
# include <sys/prctl.h>
#endif
#ifdef USE_OPENSSL
# include <openssl/err.h>
#endif
#ifndef __sgi
/* IRIX doesn't like the alarm based time() optimization */
/* #define USE_ALARM */
#endif
#ifdef HAVE_GETUID
# ifndef HAVE_ISSETUGID
static int l_issetugid(void) {
return (geteuid() != getuid() || getegid() != getgid());
}
# define issetugid l_issetugid
# endif
#endif
static volatile sig_atomic_t srv_shutdown = 0;
static volatile sig_atomic_t graceful_shutdown = 0;
static volatile sig_atomic_t handle_sig_alarm = 1;
static volatile sig_atomic_t handle_sig_hup = 0;
static volatile sig_atomic_t forwarded_sig_hup = 0;
#if defined(HAVE_SIGACTION) && defined(SA_SIGINFO)
static volatile siginfo_t last_sigterm_info;
static volatile siginfo_t last_sighup_info;
static void sigaction_handler(int sig, siginfo_t *si, void *context) {
static siginfo_t empty_siginfo;
UNUSED(context);
if (!si) si = &empty_siginfo;
switch (sig) {
case SIGTERM:
srv_shutdown = 1;
last_sigterm_info = *si;
break;
case SIGINT:
if (graceful_shutdown) {
srv_shutdown = 1;
} else {
graceful_shutdown = 1;
}
last_sigterm_info = *si;
break;
case SIGALRM:
handle_sig_alarm = 1;
break;
case SIGHUP:
/**
* we send the SIGHUP to all procs in the process-group
* this includes ourself
*
* make sure we only send it once and don't create a
* infinite loop
*/
if (!forwarded_sig_hup) {
handle_sig_hup = 1;
last_sighup_info = *si;
} else {
forwarded_sig_hup = 0;
}
break;
case SIGCHLD:
break;
}
}
#elif defined(HAVE_SIGNAL) || defined(HAVE_SIGACTION)
static void signal_handler(int sig) {
switch (sig) {
case SIGTERM: srv_shutdown = 1; break;
case SIGINT:
if (graceful_shutdown) srv_shutdown = 1;
else graceful_shutdown = 1;
break;
case SIGALRM: handle_sig_alarm = 1; break;
case SIGHUP: handle_sig_hup = 1; break;
case SIGCHLD: break;
}
}
#endif
#ifdef HAVE_FORK
static void daemonize(void) {
#ifdef SIGTTOU
signal(SIGTTOU, SIG_IGN);
#endif
#ifdef SIGTTIN
signal(SIGTTIN, SIG_IGN);
#endif
#ifdef SIGTSTP
signal(SIGTSTP, SIG_IGN);
#endif
if (0 != fork()) exit(0);
if (-1 == setsid()) exit(0);
signal(SIGHUP, SIG_IGN);
if (0 != fork()) exit(0);
if (0 != chdir("/")) exit(0);
}
#endif
static server *server_init(void) {
int i;
FILE *frandom = NULL;
server *srv = calloc(1, sizeof(*srv));
force_assert(srv);
#define CLEAN(x) \
srv->x = buffer_init();
CLEAN(response_header);
CLEAN(parse_full_path);
CLEAN(ts_debug_str);
CLEAN(ts_date_str);
CLEAN(errorlog_buf);
CLEAN(response_range);
CLEAN(tmp_buf);
srv->empty_string = buffer_init_string("");
CLEAN(cond_check_buf);
CLEAN(srvconf.errorlog_file);
CLEAN(srvconf.breakagelog_file);
CLEAN(srvconf.groupname);
CLEAN(srvconf.username);
CLEAN(srvconf.changeroot);
CLEAN(srvconf.bindhost);
CLEAN(srvconf.event_handler);
CLEAN(srvconf.pid_file);
CLEAN(tmp_chunk_len);
#undef CLEAN
#define CLEAN(x) \
srv->x = array_init();
CLEAN(config_context);
CLEAN(config_touched);
CLEAN(status);
#undef CLEAN
for (i = 0; i < FILE_CACHE_MAX; i++) {
srv->mtime_cache[i].mtime = (time_t)-1;
srv->mtime_cache[i].str = buffer_init();
}
if ((NULL != (frandom = fopen("/dev/urandom", "rb")) || NULL != (frandom = fopen("/dev/random", "rb")))
&& 1 == fread(srv->entropy, sizeof(srv->entropy), 1, frandom)) {
unsigned int e;
memcpy(&e, srv->entropy, sizeof(e) < sizeof(srv->entropy) ? sizeof(e) : sizeof(srv->entropy));
srand(e);
srv->is_real_entropy = 1;
} else {
unsigned int j;
srand(time(NULL) ^ getpid());
srv->is_real_entropy = 0;
for (j = 0; j < sizeof(srv->entropy); j++)
srv->entropy[j] = rand();
}
if (frandom) fclose(frandom);
srv->cur_ts = time(NULL);
srv->startup_ts = srv->cur_ts;
srv->conns = calloc(1, sizeof(*srv->conns));
force_assert(srv->conns);
srv->joblist = calloc(1, sizeof(*srv->joblist));
force_assert(srv->joblist);
srv->fdwaitqueue = calloc(1, sizeof(*srv->fdwaitqueue));
force_assert(srv->fdwaitqueue);
srv->srvconf.modules = array_init();
srv->srvconf.modules_dir = buffer_init_string(LIBRARY_DIR);
srv->srvconf.network_backend = buffer_init();
srv->srvconf.upload_tempdirs = array_init();
srv->srvconf.reject_expect_100_with_417 = 1;
/* use syslog */
srv->errorlog_fd = STDERR_FILENO;
srv->errorlog_mode = ERRORLOG_FD;
srv->split_vals = array_init();
return srv;
}
static void server_free(server *srv) {
size_t i;
for (i = 0; i < FILE_CACHE_MAX; i++) {
buffer_free(srv->mtime_cache[i].str);
}
#define CLEAN(x) \
buffer_free(srv->x);
CLEAN(response_header);
CLEAN(parse_full_path);
CLEAN(ts_debug_str);
CLEAN(ts_date_str);
CLEAN(errorlog_buf);
CLEAN(response_range);
CLEAN(tmp_buf);
CLEAN(empty_string);
CLEAN(cond_check_buf);
CLEAN(srvconf.errorlog_file);
CLEAN(srvconf.breakagelog_file);
CLEAN(srvconf.groupname);
CLEAN(srvconf.username);
CLEAN(srvconf.changeroot);
CLEAN(srvconf.bindhost);
CLEAN(srvconf.event_handler);
CLEAN(srvconf.pid_file);
CLEAN(srvconf.modules_dir);
CLEAN(srvconf.network_backend);
CLEAN(tmp_chunk_len);
#undef CLEAN
#if 0
fdevent_unregister(srv->ev, srv->fd);
#endif
fdevent_free(srv->ev);
free(srv->conns);
if (srv->config_storage) {
for (i = 0; i < srv->config_context->used; i++) {
specific_config *s = srv->config_storage[i];
if (!s) continue;
buffer_free(s->document_root);
buffer_free(s->server_name);
buffer_free(s->server_tag);
buffer_free(s->ssl_pemfile);
buffer_free(s->ssl_ca_file);
buffer_free(s->ssl_cipher_list);
buffer_free(s->ssl_dh_file);
buffer_free(s->ssl_ec_curve);
buffer_free(s->error_handler);
buffer_free(s->errorfile_prefix);
array_free(s->mimetypes);
buffer_free(s->ssl_verifyclient_username);
#ifdef USE_OPENSSL
SSL_CTX_free(s->ssl_ctx);
EVP_PKEY_free(s->ssl_pemfile_pkey);
X509_free(s->ssl_pemfile_x509);
if (NULL != s->ssl_ca_file_cert_names) sk_X509_NAME_pop_free(s->ssl_ca_file_cert_names, X509_NAME_free);
#endif
free(s);
}
free(srv->config_storage);
srv->config_storage = NULL;
}
#define CLEAN(x) \
array_free(srv->x);
CLEAN(config_context);
CLEAN(config_touched);
CLEAN(status);
CLEAN(srvconf.upload_tempdirs);
#undef CLEAN
joblist_free(srv, srv->joblist);
fdwaitqueue_free(srv, srv->fdwaitqueue);
if (srv->stat_cache) {
stat_cache_free(srv->stat_cache);
}
array_free(srv->srvconf.modules);
array_free(srv->split_vals);
#ifdef USE_OPENSSL
if (srv->ssl_is_init) {
CRYPTO_cleanup_all_ex_data();
ERR_free_strings();
ERR_remove_state(0);
EVP_cleanup();
}
#endif
free(srv);
}
static void show_version (void) {
#ifdef USE_OPENSSL
# define TEXT_SSL " (ssl)"
#else
# define TEXT_SSL
#endif
char *b = PACKAGE_DESC TEXT_SSL \
" - a light and fast webserver\n" \
"Build-Date: " __DATE__ " " __TIME__ "\n";
;
#undef TEXT_SSL
write(STDOUT_FILENO, b, strlen(b));
}
static void show_features (void) {
const char features[] = ""
#ifdef USE_SELECT
"\t+ select (generic)\n"
#else
"\t- select (generic)\n"
#endif
#ifdef USE_POLL
"\t+ poll (Unix)\n"
#else
"\t- poll (Unix)\n"
#endif
#ifdef USE_LINUX_SIGIO
"\t+ rt-signals (Linux 2.4+)\n"
#else
"\t- rt-signals (Linux 2.4+)\n"
#endif
#ifdef USE_LINUX_EPOLL
"\t+ epoll (Linux 2.6)\n"
#else
"\t- epoll (Linux 2.6)\n"
#endif
#ifdef USE_SOLARIS_DEVPOLL
"\t+ /dev/poll (Solaris)\n"
#else
"\t- /dev/poll (Solaris)\n"
#endif
#ifdef USE_SOLARIS_PORT
"\t+ eventports (Solaris)\n"
#else
"\t- eventports (Solaris)\n"
#endif
#ifdef USE_FREEBSD_KQUEUE
"\t+ kqueue (FreeBSD)\n"
#else
"\t- kqueue (FreeBSD)\n"
#endif
#ifdef USE_LIBEV
"\t+ libev (generic)\n"
#else
"\t- libev (generic)\n"
#endif
"\nNetwork handler:\n\n"
#if defined USE_LINUX_SENDFILE
"\t+ linux-sendfile\n"
#else
"\t- linux-sendfile\n"
#endif
#if defined USE_FREEBSD_SENDFILE
"\t+ freebsd-sendfile\n"
#else
"\t- freebsd-sendfile\n"
#endif
#if defined USE_SOLARIS_SENDFILEV
"\t+ solaris-sendfilev\n"
#else
"\t- solaris-sendfilev\n"
#endif
#if defined USE_WRITEV
"\t+ writev\n"
#else
"\t- writev\n"
#endif
"\t+ write\n"
#ifdef USE_MMAP
"\t+ mmap support\n"
#else
"\t- mmap support\n"
#endif
"\nFeatures:\n\n"
#ifdef HAVE_IPV6
"\t+ IPv6 support\n"
#else
"\t- IPv6 support\n"
#endif
#if defined HAVE_ZLIB_H && defined HAVE_LIBZ
"\t+ zlib support\n"
#else
"\t- zlib support\n"
#endif
#if defined HAVE_BZLIB_H && defined HAVE_LIBBZ2
"\t+ bzip2 support\n"
#else
"\t- bzip2 support\n"
#endif
#ifdef HAVE_LIBCRYPT
"\t+ crypt support\n"
#else
"\t- crypt support\n"
#endif
#ifdef USE_OPENSSL
"\t+ SSL Support\n"
#else
"\t- SSL Support\n"
#endif
#ifdef HAVE_LIBPCRE
"\t+ PCRE support\n"
#else
"\t- PCRE support\n"
#endif
#ifdef HAVE_MYSQL
"\t+ mySQL support\n"
#else
"\t- mySQL support\n"
#endif
#if defined(HAVE_LDAP_H) && defined(HAVE_LBER_H) && defined(HAVE_LIBLDAP) && defined(HAVE_LIBLBER)
"\t+ LDAP support\n"
#else
"\t- LDAP support\n"
#endif
#ifdef HAVE_MEMCACHE_H
"\t+ memcached support\n"
#else
"\t- memcached support\n"
#endif
#ifdef HAVE_FAM_H
"\t+ FAM support\n"
#else
"\t- FAM support\n"
#endif
#ifdef HAVE_LUA_H
"\t+ LUA support\n"
#else
"\t- LUA support\n"
#endif
#ifdef HAVE_LIBXML_H
"\t+ xml support\n"
#else
"\t- xml support\n"
#endif
#ifdef HAVE_SQLITE3_H
"\t+ SQLite support\n"
#else
"\t- SQLite support\n"
#endif
#ifdef HAVE_GDBM_H
"\t+ GDBM support\n"
#else
"\t- GDBM support\n"
#endif
"\n";
show_version();
printf("\nEvent Handlers:\n\n%s", features);
}
static void show_help (void) {
#ifdef USE_OPENSSL
# define TEXT_SSL " (ssl)"
#else
# define TEXT_SSL
#endif
char *b = PACKAGE_DESC TEXT_SSL " ("__DATE__ " " __TIME__ ")" \
" - a light and fast webserver\n" \
"usage:\n" \
" -f <name> filename of the config-file\n" \
" -m <name> module directory (default: "LIBRARY_DIR")\n" \
" -p print the parsed config-file in internal form, and exit\n" \
" -t test the config-file, and exit\n" \
" -D don't go to background (default: go to background)\n" \
" -v show version\n" \
" -V show compile-time features\n" \
" -h show this help\n" \
"\n"
;
#undef TEXT_SSL
#undef TEXT_IPV6
write(STDOUT_FILENO, b, strlen(b));
}
int main (int argc, char **argv) {
server *srv = NULL;
int print_config = 0;
int test_config = 0;
int i_am_root;
int o;
int num_childs = 0;
int pid_fd = -1, fd;
size_t i;
#ifdef HAVE_SIGACTION
struct sigaction act;
#endif
#ifdef HAVE_GETRLIMIT
struct rlimit rlim;
#endif
#ifdef USE_ALARM
struct itimerval interval;
interval.it_interval.tv_sec = 1;
interval.it_interval.tv_usec = 0;
interval.it_value.tv_sec = 1;
interval.it_value.tv_usec = 0;
#endif
/* for nice %b handling in strfime() */
setlocale(LC_TIME, "C");
if (NULL == (srv = server_init())) {
fprintf(stderr, "did this really happen?\n");
return -1;
}
/* init structs done */
srv->srvconf.port = 0;
#ifdef HAVE_GETUID
i_am_root = (getuid() == 0);
#else
i_am_root = 0;
#endif
srv->srvconf.dont_daemonize = 0;
while(-1 != (o = getopt(argc, argv, "f:m:hvVDpt"))) {
switch(o) {
case 'f':
if (srv->config_storage) {
log_error_write(srv, __FILE__, __LINE__, "s",
"Can only read one config file. Use the include command to use multiple config files.");
server_free(srv);
return -1;
}
if (config_read(srv, optarg)) {
server_free(srv);
return -1;
}
break;
case 'm':
buffer_copy_string(srv->srvconf.modules_dir, optarg);
break;
case 'p': print_config = 1; break;
case 't': test_config = 1; break;
case 'D': srv->srvconf.dont_daemonize = 1; break;
case 'v': show_version(); return 0;
case 'V': show_features(); return 0;
case 'h': show_help(); return 0;
default:
show_help();
server_free(srv);
return -1;
}
}
if (!srv->config_storage) {
log_error_write(srv, __FILE__, __LINE__, "s",
"No configuration available. Try using -f option.");
server_free(srv);
return -1;
}
if (print_config) {
data_unset *dc = srv->config_context->data[0];
if (dc) {
dc->print(dc, 0);
fprintf(stdout, "\n");
} else {
/* shouldn't happend */
fprintf(stderr, "global config not found\n");
}
}
if (test_config) {
printf("Syntax OK\n");
}
if (test_config || print_config) {
server_free(srv);
return 0;
}
/* close stdin and stdout, as they are not needed */
openDevNull(STDIN_FILENO);
openDevNull(STDOUT_FILENO);
if (0 != config_set_defaults(srv)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"setting default values failed");
server_free(srv);
return -1;
}
/* UID handling */
#ifdef HAVE_GETUID
if (!i_am_root && issetugid()) {
/* we are setuid-root */
log_error_write(srv, __FILE__, __LINE__, "s",
"Are you nuts ? Don't apply a SUID bit to this binary");
server_free(srv);
return -1;
}
#endif
/* check document-root */
if (buffer_string_is_empty(srv->config_storage[0]->document_root)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"document-root is not set\n");
server_free(srv);
return -1;
}
if (plugins_load(srv)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"loading plugins finally failed");
plugins_free(srv);
server_free(srv);
return -1;
}
/* open pid file BEFORE chroot */
if (!buffer_string_is_empty(srv->srvconf.pid_file)) {
if (-1 == (pid_fd = open(srv->srvconf.pid_file->ptr, O_WRONLY | O_CREAT | O_EXCL | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH))) {
struct stat st;
if (errno != EEXIST) {
log_error_write(srv, __FILE__, __LINE__, "sbs",
"opening pid-file failed:", srv->srvconf.pid_file, strerror(errno));
return -1;
}
if (0 != stat(srv->srvconf.pid_file->ptr, &st)) {
log_error_write(srv, __FILE__, __LINE__, "sbs",
"stating existing pid-file failed:", srv->srvconf.pid_file, strerror(errno));
}
if (!S_ISREG(st.st_mode)) {
log_error_write(srv, __FILE__, __LINE__, "sb",
"pid-file exists and isn't regular file:", srv->srvconf.pid_file);
return -1;
}
if (-1 == (pid_fd = open(srv->srvconf.pid_file->ptr, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH))) {
log_error_write(srv, __FILE__, __LINE__, "sbs",
"opening pid-file failed:", srv->srvconf.pid_file, strerror(errno));
return -1;
}
}
}
if (srv->event_handler == FDEVENT_HANDLER_SELECT) {
/* select limits itself
*
* as it is a hard limit and will lead to a segfault we add some safety
* */
srv->max_fds = FD_SETSIZE - 200;
} else {
srv->max_fds = 4096;
}
if (i_am_root) {
struct group *grp = NULL;
struct passwd *pwd = NULL;
int use_rlimit = 1;
#ifdef HAVE_VALGRIND_VALGRIND_H
if (RUNNING_ON_VALGRIND) use_rlimit = 0;
#endif
#ifdef HAVE_GETRLIMIT
if (0 != getrlimit(RLIMIT_NOFILE, &rlim)) {
log_error_write(srv, __FILE__, __LINE__,
"ss", "couldn't get 'max filedescriptors'",
strerror(errno));
return -1;
}
if (use_rlimit && srv->srvconf.max_fds) {
/* set rlimits */
rlim.rlim_cur = srv->srvconf.max_fds;
rlim.rlim_max = srv->srvconf.max_fds;
if (0 != setrlimit(RLIMIT_NOFILE, &rlim)) {
log_error_write(srv, __FILE__, __LINE__,
"ss", "couldn't set 'max filedescriptors'",
strerror(errno));
return -1;
}
}
if (srv->event_handler == FDEVENT_HANDLER_SELECT) {
srv->max_fds = rlim.rlim_cur < ((int)FD_SETSIZE) - 200 ? rlim.rlim_cur : FD_SETSIZE - 200;
} else {
srv->max_fds = rlim.rlim_cur;
}
/* set core file rlimit, if enable_cores is set */
if (use_rlimit && srv->srvconf.enable_cores && getrlimit(RLIMIT_CORE, &rlim) == 0) {
rlim.rlim_cur = rlim.rlim_max;
setrlimit(RLIMIT_CORE, &rlim);
}
#endif
if (srv->event_handler == FDEVENT_HANDLER_SELECT) {
/* don't raise the limit above FD_SET_SIZE */
if (srv->max_fds > ((int)FD_SETSIZE) - 200) {
log_error_write(srv, __FILE__, __LINE__, "sd",
"can't raise max filedescriptors above", FD_SETSIZE - 200,
"if event-handler is 'select'. Use 'poll' or something else or reduce server.max-fds.");
return -1;
}
}
#ifdef HAVE_PWD_H
/* set user and group */
if (!buffer_string_is_empty(srv->srvconf.username)) {
if (NULL == (pwd = getpwnam(srv->srvconf.username->ptr))) {
log_error_write(srv, __FILE__, __LINE__, "sb",
"can't find username", srv->srvconf.username);
return -1;
}
if (pwd->pw_uid == 0) {
log_error_write(srv, __FILE__, __LINE__, "s",
"I will not set uid to 0\n");
return -1;
}
}
if (!buffer_string_is_empty(srv->srvconf.groupname)) {
if (NULL == (grp = getgrnam(srv->srvconf.groupname->ptr))) {
log_error_write(srv, __FILE__, __LINE__, "sb",
"can't find groupname", srv->srvconf.groupname);
return -1;
}
if (grp->gr_gid == 0) {
log_error_write(srv, __FILE__, __LINE__, "s",
"I will not set gid to 0\n");
return -1;
}
}
#endif
/* we need root-perms for port < 1024 */
if (0 != network_init(srv)) {
plugins_free(srv);
server_free(srv);
return -1;
}
#ifdef HAVE_PWD_H
/*
* Change group before chroot, when we have access
* to /etc/group
* */
if (NULL != grp) {
if (-1 == setgid(grp->gr_gid)) {
log_error_write(srv, __FILE__, __LINE__, "ss", "setgid failed: ", strerror(errno));
return -1;
}
if (-1 == setgroups(0, NULL)) {
log_error_write(srv, __FILE__, __LINE__, "ss", "setgroups failed: ", strerror(errno));
return -1;
}
if (!buffer_string_is_empty(srv->srvconf.username)) {
initgroups(srv->srvconf.username->ptr, grp->gr_gid);
}
}
#endif
#ifdef HAVE_CHROOT
if (!buffer_string_is_empty(srv->srvconf.changeroot)) {
tzset();
if (-1 == chroot(srv->srvconf.changeroot->ptr)) {
log_error_write(srv, __FILE__, __LINE__, "ss", "chroot failed: ", strerror(errno));
return -1;
}
if (-1 == chdir("/")) {
log_error_write(srv, __FILE__, __LINE__, "ss", "chdir failed: ", strerror(errno));
return -1;
}
}
#endif
#ifdef HAVE_PWD_H
/* drop root privs */
if (NULL != pwd) {
if (-1 == setuid(pwd->pw_uid)) {
log_error_write(srv, __FILE__, __LINE__, "ss", "setuid failed: ", strerror(errno));
return -1;
}
}
#endif
#if defined(HAVE_SYS_PRCTL_H) && defined(PR_SET_DUMPABLE)
/**
* on IRIX 6.5.30 they have prctl() but no DUMPABLE
*/
if (srv->srvconf.enable_cores) {
prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
}
#endif
} else {
#ifdef HAVE_GETRLIMIT
if (0 != getrlimit(RLIMIT_NOFILE, &rlim)) {
log_error_write(srv, __FILE__, __LINE__,
"ss", "couldn't get 'max filedescriptors'",
strerror(errno));
return -1;
}
/**
* we are not root can can't increase the fd-limit, but we can reduce it
*/
if (srv->srvconf.max_fds && srv->srvconf.max_fds < rlim.rlim_cur) {
/* set rlimits */
rlim.rlim_cur = srv->srvconf.max_fds;
if (0 != setrlimit(RLIMIT_NOFILE, &rlim)) {
log_error_write(srv, __FILE__, __LINE__,
"ss", "couldn't set 'max filedescriptors'",
strerror(errno));
return -1;
}
}
if (srv->event_handler == FDEVENT_HANDLER_SELECT) {
srv->max_fds = rlim.rlim_cur < ((int)FD_SETSIZE) - 200 ? rlim.rlim_cur : FD_SETSIZE - 200;
} else {
srv->max_fds = rlim.rlim_cur;
}
/* set core file rlimit, if enable_cores is set */
if (srv->srvconf.enable_cores && getrlimit(RLIMIT_CORE, &rlim) == 0) {
rlim.rlim_cur = rlim.rlim_max;
setrlimit(RLIMIT_CORE, &rlim);
}
#endif
if (srv->event_handler == FDEVENT_HANDLER_SELECT) {
/* don't raise the limit above FD_SET_SIZE */
if (srv->max_fds > ((int)FD_SETSIZE) - 200) {
log_error_write(srv, __FILE__, __LINE__, "sd",
"can't raise max filedescriptors above", FD_SETSIZE - 200,
"if event-handler is 'select'. Use 'poll' or something else or reduce server.max-fds.");
return -1;
}
}
if (0 != network_init(srv)) {
plugins_free(srv);
server_free(srv);
return -1;
}
}
/* set max-conns */
if (srv->srvconf.max_conns > srv->max_fds/2) {
/* we can't have more connections than max-fds/2 */
log_error_write(srv, __FILE__, __LINE__, "sdd", "can't have more connections than fds/2: ", srv->srvconf.max_conns, srv->max_fds);
srv->max_conns = srv->max_fds/2;
} else if (srv->srvconf.max_conns) {
/* otherwise respect the wishes of the user */
srv->max_conns = srv->srvconf.max_conns;
} else {
/* or use the default: we really don't want to hit max-fds */
srv->max_conns = srv->max_fds/3;
}
if (HANDLER_GO_ON != plugins_call_init(srv)) {
log_error_write(srv, __FILE__, __LINE__, "s", "Initialization of plugins failed. Going down.");
plugins_free(srv);
network_close(srv);
server_free(srv);
return -1;
}
#ifdef HAVE_FORK
/* network is up, let's deamonize ourself */
if (srv->srvconf.dont_daemonize == 0) daemonize();
#endif
#ifdef HAVE_SIGACTION
memset(&act, 0, sizeof(act));
act.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &act, NULL);
sigaction(SIGUSR1, &act, NULL);
# if defined(SA_SIGINFO)
act.sa_sigaction = sigaction_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_SIGINFO;
# else
act.sa_handler = signal_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
# endif
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
sigaction(SIGHUP, &act, NULL);
sigaction(SIGALRM, &act, NULL);
sigaction(SIGCHLD, &act, NULL);
#elif defined(HAVE_SIGNAL)
/* ignore the SIGPIPE from sendfile() */
signal(SIGPIPE, SIG_IGN);
signal(SIGUSR1, SIG_IGN);
signal(SIGALRM, signal_handler);
signal(SIGTERM, signal_handler);
signal(SIGHUP, signal_handler);
signal(SIGCHLD, signal_handler);
signal(SIGINT, signal_handler);
#endif
#ifdef USE_ALARM
signal(SIGALRM, signal_handler);
/* setup periodic timer (1 second) */
if (setitimer(ITIMER_REAL, &interval, NULL)) {
log_error_write(srv, __FILE__, __LINE__, "s", "setting timer failed");
return -1;
}
getitimer(ITIMER_REAL, &interval);
#endif
srv->gid = getgid();
srv->uid = getuid();
/* write pid file */
if (pid_fd != -1) {
buffer_copy_int(srv->tmp_buf, getpid());
buffer_append_string_len(srv->tmp_buf, CONST_STR_LEN("\n"));
write(pid_fd, CONST_BUF_LEN(srv->tmp_buf));
close(pid_fd);
pid_fd = -1;
}
/* Close stderr ASAP in the child process to make sure that nothing
* is being written to that fd which may not be valid anymore. */
if (-1 == log_error_open(srv)) {
log_error_write(srv, __FILE__, __LINE__, "s", "Opening errorlog failed. Going down.");
plugins_free(srv);
network_close(srv);
server_free(srv);
return -1;
}
if (HANDLER_GO_ON != plugins_call_set_defaults(srv)) {
log_error_write(srv, __FILE__, __LINE__, "s", "Configuration of plugins failed. Going down.");
plugins_free(srv);
network_close(srv);
server_free(srv);
return -1;
}
/* dump unused config-keys */
for (i = 0; i < srv->config_context->used; i++) {
array *config = ((data_config *)srv->config_context->data[i])->value;
size_t j;
for (j = 0; config && j < config->used; j++) {
data_unset *du = config->data[j];
/* all var.* is known as user defined variable */
if (strncmp(du->key->ptr, "var.", sizeof("var.") - 1) == 0) {
continue;
}
if (NULL == array_get_element(srv->config_touched, du->key->ptr)) {
log_error_write(srv, __FILE__, __LINE__, "sbs",
"WARNING: unknown config-key:",
du->key,
"(ignored)");
}
}
}
if (srv->config_unsupported) {
log_error_write(srv, __FILE__, __LINE__, "s",
"Configuration contains unsupported keys. Going down.");
}
if (srv->config_deprecated) {
log_error_write(srv, __FILE__, __LINE__, "s",
"Configuration contains deprecated keys. Going down.");
}
if (srv->config_unsupported || srv->config_deprecated) {
plugins_free(srv);
network_close(srv);
server_free(srv);
return -1;
}
#ifdef HAVE_FORK
/* start watcher and workers */
num_childs = srv->srvconf.max_worker;
if (num_childs > 0) {
int child = 0;
while (!child && !srv_shutdown && !graceful_shutdown) {
if (num_childs > 0) {
switch (fork()) {
case -1:
return -1;
case 0:
child = 1;
break;
default:
num_childs--;
break;
}
} else {
int status;
if (-1 != wait(&status)) {
/**
* one of our workers went away
*/
num_childs++;
} else {
switch (errno) {
case EINTR:
/**
* if we receive a SIGHUP we have to close our logs ourself as we don't
* have the mainloop who can help us here
*/
if (handle_sig_hup) {
handle_sig_hup = 0;
log_error_cycle(srv);
/**
* forward to all procs in the process-group
*
* we also send it ourself
*/
if (!forwarded_sig_hup) {
forwarded_sig_hup = 1;
kill(0, SIGHUP);
}
}
break;
default:
break;
}
}
}
}
/**
* for the parent this is the exit-point
*/
if (!child) {
/**
* kill all children too
*/
if (graceful_shutdown) {
kill(0, SIGINT);
} else if (srv_shutdown) {
kill(0, SIGTERM);
}
log_error_close(srv);
network_close(srv);
connections_free(srv);
plugins_free(srv);
server_free(srv);
return 0;
}
}
#endif
if (NULL == (srv->ev = fdevent_init(srv, srv->max_fds + 1, srv->event_handler))) {
log_error_write(srv, __FILE__, __LINE__,
"s", "fdevent_init failed");
return -1;
}
/* libev backend overwrites our SIGCHLD handler and calls waitpid on SIGCHLD; we want our own SIGCHLD handling. */
#ifdef HAVE_SIGACTION
sigaction(SIGCHLD, &act, NULL);
#elif defined(HAVE_SIGNAL)
signal(SIGCHLD, signal_handler);
#endif
/*
* kqueue() is called here, select resets its internals,
* all server sockets get their handlers
*
* */
if (0 != network_register_fdevents(srv)) {
plugins_free(srv);
network_close(srv);
server_free(srv);
return -1;
}
/* might fail if user is using fam (not gamin) and famd isn't running */
if (NULL == (srv->stat_cache = stat_cache_init())) {
log_error_write(srv, __FILE__, __LINE__, "s",
"stat-cache could not be setup, dieing.");
return -1;
}
#ifdef HAVE_FAM_H
/* setup FAM */
if (srv->srvconf.stat_cache_engine == STAT_CACHE_ENGINE_FAM) {
if (0 != FAMOpen2(&srv->stat_cache->fam, "lighttpd")) {
log_error_write(srv, __FILE__, __LINE__, "s",
"could not open a fam connection, dieing.");
return -1;
}
#ifdef HAVE_FAMNOEXISTS
FAMNoExists(&srv->stat_cache->fam);
#endif
fdevent_register(srv->ev, FAMCONNECTION_GETFD(&srv->stat_cache->fam), stat_cache_handle_fdevent, NULL);
fdevent_event_set(srv->ev, &(srv->stat_cache->fam_fcce_ndx), FAMCONNECTION_GETFD(&srv->stat_cache->fam), FDEVENT_IN);
}
#endif
/* get the current number of FDs */
srv->cur_fds = open("/dev/null", O_RDONLY);
close(srv->cur_fds);
for (i = 0; i < srv->srv_sockets.used; i++) {
server_socket *srv_socket = srv->srv_sockets.ptr[i];
if (-1 == fdevent_fcntl_set(srv->ev, srv_socket->fd)) {
log_error_write(srv, __FILE__, __LINE__, "ss", "fcntl failed:", strerror(errno));
return -1;
}
}
/* main-loop */
while (!srv_shutdown) {
int n;
size_t ndx;
time_t min_ts;
if (handle_sig_hup) {
handler_t r;
/* reset notification */
handle_sig_hup = 0;
/* cycle logfiles */
switch(r = plugins_call_handle_sighup(srv)) {
case HANDLER_GO_ON:
break;
default:
log_error_write(srv, __FILE__, __LINE__, "sd", "sighup-handler return with an error", r);
break;
}
if (-1 == log_error_cycle(srv)) {
log_error_write(srv, __FILE__, __LINE__, "s", "cycling errorlog failed, dying");
return -1;
} else {
#ifdef HAVE_SIGACTION
log_error_write(srv, __FILE__, __LINE__, "sdsd",
"logfiles cycled UID =",
last_sighup_info.si_uid,
"PID =",
last_sighup_info.si_pid);
#else
log_error_write(srv, __FILE__, __LINE__, "s",
"logfiles cycled");
#endif
}
}
if (handle_sig_alarm) {
/* a new second */
#ifdef USE_ALARM
/* reset notification */
handle_sig_alarm = 0;
#endif
/* get current time */
min_ts = time(NULL);
if (min_ts != srv->cur_ts) {
#ifdef DEBUG_CONNECTION_STATES
int cs = 0;
#endif
connections *conns = srv->conns;
handler_t r;
switch(r = plugins_call_handle_trigger(srv)) {
case HANDLER_GO_ON:
break;
case HANDLER_ERROR:
log_error_write(srv, __FILE__, __LINE__, "s", "one of the triggers failed");
break;
default:
log_error_write(srv, __FILE__, __LINE__, "d", r);
break;
}
/* trigger waitpid */
srv->cur_ts = min_ts;
/* cleanup stat-cache */
stat_cache_trigger_cleanup(srv);
/**
* check all connections for timeouts
*
*/
for (ndx = 0; ndx < conns->used; ndx++) {
int changed = 0;
connection *con;
int t_diff;
con = conns->ptr[ndx];
if (con->state == CON_STATE_READ ||
con->state == CON_STATE_READ_POST) {
if (con->request_count == 1 || con->state == CON_STATE_READ_POST) {
if (srv->cur_ts - con->read_idle_ts > con->conf.max_read_idle) {
/* time - out */
if (con->conf.log_request_handling) {
log_error_write(srv, __FILE__, __LINE__, "sd",
"connection closed - read timeout:", con->fd);
}
connection_set_state(srv, con, CON_STATE_ERROR);
changed = 1;
}
} else {
if (srv->cur_ts - con->read_idle_ts > con->keep_alive_idle) {
/* time - out */
if (con->conf.log_request_handling) {
log_error_write(srv, __FILE__, __LINE__, "sd",
"connection closed - keep-alive timeout:", con->fd);
}
connection_set_state(srv, con, CON_STATE_ERROR);
changed = 1;
}
}
}
if ((con->state == CON_STATE_WRITE) &&
(con->write_request_ts != 0)) {
#if 0
if (srv->cur_ts - con->write_request_ts > 60) {
log_error_write(srv, __FILE__, __LINE__, "sdd",
"connection closed - pre-write-request-timeout:", con->fd, srv->cur_ts - con->write_request_ts);
}
#endif
if (srv->cur_ts - con->write_request_ts > con->conf.max_write_idle) {
/* time - out */
if (con->conf.log_timeouts) {
log_error_write(srv, __FILE__, __LINE__, "sbsosds",
"NOTE: a request for",
con->request.uri,
"timed out after writing",
con->bytes_written,
"bytes. We waited",
(int)con->conf.max_write_idle,
"seconds. If this a problem increase server.max-write-idle");
}
connection_set_state(srv, con, CON_STATE_ERROR);
changed = 1;
}
}
if (con->state == CON_STATE_CLOSE && (srv->cur_ts - con->close_timeout_ts > HTTP_LINGER_TIMEOUT)) {
changed = 1;
}
/* we don't like div by zero */
if (0 == (t_diff = srv->cur_ts - con->connection_start)) t_diff = 1;
if (con->traffic_limit_reached &&
(con->conf.kbytes_per_second == 0 ||
((con->bytes_written / t_diff) < con->conf.kbytes_per_second * 1024))) {
/* enable connection again */
con->traffic_limit_reached = 0;
changed = 1;
}
if (changed) {
connection_state_machine(srv, con);
}
con->bytes_written_cur_second = 0;
*(con->conf.global_bytes_per_second_cnt_ptr) = 0;
#if DEBUG_CONNECTION_STATES
if (cs == 0) {
fprintf(stderr, "connection-state: ");
cs = 1;
}
fprintf(stderr, "c[%d,%d]: %s ",
con->fd,
con->fcgi.fd,
connection_get_state(con->state));
#endif
}
#ifdef DEBUG_CONNECTION_STATES
if (cs == 1) fprintf(stderr, "\n");
#endif
}
}
if (srv->sockets_disabled) {
/* our server sockets are disabled, why ? */
if ((srv->cur_fds + srv->want_fds < srv->max_fds * 8 / 10) && /* we have enough unused fds */
(srv->conns->used <= srv->max_conns * 9 / 10) &&
(0 == graceful_shutdown)) {
for (i = 0; i < srv->srv_sockets.used; i++) {
server_socket *srv_socket = srv->srv_sockets.ptr[i];
fdevent_event_set(srv->ev, &(srv_socket->fde_ndx), srv_socket->fd, FDEVENT_IN);
}
log_error_write(srv, __FILE__, __LINE__, "s", "[note] sockets enabled again");
srv->sockets_disabled = 0;
}
} else {
if ((srv->cur_fds + srv->want_fds > srv->max_fds * 9 / 10) || /* out of fds */
(srv->conns->used >= srv->max_conns) || /* out of connections */
(graceful_shutdown)) { /* graceful_shutdown */
/* disable server-fds */
for (i = 0; i < srv->srv_sockets.used; i++) {
server_socket *srv_socket = srv->srv_sockets.ptr[i];
fdevent_event_del(srv->ev, &(srv_socket->fde_ndx), srv_socket->fd);
if (graceful_shutdown) {
/* we don't want this socket anymore,
*
* closing it right away will make it possible for
* the next lighttpd to take over (graceful restart)
* */
fdevent_unregister(srv->ev, srv_socket->fd);
close(srv_socket->fd);
srv_socket->fd = -1;
/* network_close() will cleanup after us */
if (!buffer_string_is_empty(srv->srvconf.pid_file) &&
buffer_string_is_empty(srv->srvconf.changeroot)) {
if (0 != unlink(srv->srvconf.pid_file->ptr)) {
if (errno != EACCES && errno != EPERM) {
log_error_write(srv, __FILE__, __LINE__, "sbds",
"unlink failed for:",
srv->srvconf.pid_file,
errno,
strerror(errno));
}
}
}
}
}
if (graceful_shutdown) {
log_error_write(srv, __FILE__, __LINE__, "s", "[note] graceful shutdown started");
} else if (srv->conns->used >= srv->max_conns) {
log_error_write(srv, __FILE__, __LINE__, "s", "[note] sockets disabled, connection limit reached");
} else {
log_error_write(srv, __FILE__, __LINE__, "s", "[note] sockets disabled, out-of-fds");
}
srv->sockets_disabled = 1;
}
}
if (graceful_shutdown && srv->conns->used == 0) {
/* we are in graceful shutdown phase and all connections are closed
* we are ready to terminate without harming anyone */
srv_shutdown = 1;
}
/* we still have some fds to share */
if (srv->want_fds) {
/* check the fdwaitqueue for waiting fds */
int free_fds = srv->max_fds - srv->cur_fds - 16;
connection *con;
for (; free_fds > 0 && NULL != (con = fdwaitqueue_unshift(srv, srv->fdwaitqueue)); free_fds--) {
connection_state_machine(srv, con);
srv->want_fds--;
}
}
if ((n = fdevent_poll(srv->ev, 1000)) > 0) {
/* n is the number of events */
int revents;
int fd_ndx;
#if 0
if (n > 0) {
log_error_write(srv, __FILE__, __LINE__, "sd",
"polls:", n);
}
#endif
fd_ndx = -1;
do {
fdevent_handler handler;
void *context;
handler_t r;
fd_ndx = fdevent_event_next_fdndx (srv->ev, fd_ndx);
if (-1 == fd_ndx) break; /* not all fdevent handlers know how many fds got an event */
revents = fdevent_event_get_revent (srv->ev, fd_ndx);
fd = fdevent_event_get_fd (srv->ev, fd_ndx);
handler = fdevent_get_handler(srv->ev, fd);
context = fdevent_get_context(srv->ev, fd);
/* connection_handle_fdevent needs a joblist_append */
#if 0
log_error_write(srv, __FILE__, __LINE__, "sdd",
"event for", fd, revents);
#endif
switch (r = (*handler)(srv, context, revents)) {
case HANDLER_FINISHED:
case HANDLER_GO_ON:
case HANDLER_WAIT_FOR_EVENT:
case HANDLER_WAIT_FOR_FD:
break;
case HANDLER_ERROR:
/* should never happen */
SEGFAULT();
break;
default:
log_error_write(srv, __FILE__, __LINE__, "d", r);
break;
}
} while (--n > 0);
} else if (n < 0 && errno != EINTR) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"fdevent_poll failed:",
strerror(errno));
}
for (ndx = 0; ndx < srv->joblist->used; ndx++) {
connection *con = srv->joblist->ptr[ndx];
handler_t r;
connection_state_machine(srv, con);
switch(r = plugins_call_handle_joblist(srv, con)) {
case HANDLER_FINISHED:
case HANDLER_GO_ON:
break;
default:
log_error_write(srv, __FILE__, __LINE__, "d", r);
break;
}
con->in_joblist = 0;
}
srv->joblist->used = 0;
}
if (!buffer_string_is_empty(srv->srvconf.pid_file) &&
buffer_string_is_empty(srv->srvconf.changeroot) &&
0 == graceful_shutdown) {
if (0 != unlink(srv->srvconf.pid_file->ptr)) {
if (errno != EACCES && errno != EPERM) {
log_error_write(srv, __FILE__, __LINE__, "sbds",
"unlink failed for:",
srv->srvconf.pid_file,
errno,
strerror(errno));
}
}
}
#ifdef HAVE_SIGACTION
log_error_write(srv, __FILE__, __LINE__, "sdsd",
"server stopped by UID =",
last_sigterm_info.si_uid,
"PID =",
last_sigterm_info.si_pid);
#else
log_error_write(srv, __FILE__, __LINE__, "s",
"server stopped");
#endif
/* clean-up */
log_error_close(srv);
network_close(srv);
connections_free(srv);
plugins_free(srv);
server_free(srv);
return 0;
}
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