lighttpd 1.4.x https://www.lighttpd.net/
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#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_PWD_H
#include <grp.h>
#include <pwd.h>
#endif
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#define FCGI_LISTENSOCK_FILENO 0
#ifndef UNIX_PATH_MAX
# define UNIX_PATH_MAX 108
#endif
#include "sys-socket.h"
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
/* for solaris 2.5 and netbsd 1.3.x */
#ifndef HAVE_SOCKLEN_T
typedef int socklen_t;
#endif
#ifdef HAVE_SYS_UN_H
int fcgi_spawn_connection(char *appPath, unsigned short port, const char *unixsocket, int child_count, int pid_fd) {
int fcgi_fd;
int socket_type, status;
struct timeval tv = { 0, 100 * 1000 };
struct sockaddr_un fcgi_addr_un;
struct sockaddr_in fcgi_addr_in;
struct sockaddr *fcgi_addr;
socklen_t servlen;
if (child_count < 2) {
child_count = 5;
}
if (child_count > 256) {
child_count = 256;
}
if (unixsocket) {
memset(&fcgi_addr, 0, sizeof(fcgi_addr));
fcgi_addr_un.sun_family = AF_UNIX;
strcpy(fcgi_addr_un.sun_path, unixsocket);
#ifdef SUN_LEN
servlen = SUN_LEN(&fcgi_addr_un);
#else
/* stevens says: */
servlen = strlen(fcgi_addr_un.sun_path) + sizeof(fcgi_addr_un.sun_family);
#endif
socket_type = AF_UNIX;
fcgi_addr = (struct sockaddr *) &fcgi_addr_un;
} else {
fcgi_addr_in.sin_family = AF_INET;
fcgi_addr_in.sin_addr.s_addr = htonl(INADDR_ANY);
fcgi_addr_in.sin_port = htons(port);
servlen = sizeof(fcgi_addr_in);
socket_type = AF_INET;
fcgi_addr = (struct sockaddr *) &fcgi_addr_in;
}
if (-1 == (fcgi_fd = socket(socket_type, SOCK_STREAM, 0))) {
fprintf(stderr, "%s.%d\n",
__FILE__, __LINE__);
return -1;
}
if (-1 == connect(fcgi_fd, fcgi_addr, servlen)) {
/* server is not up, spawn in */
pid_t child;
int val;
if (unixsocket) unlink(unixsocket);
close(fcgi_fd);
/* reopen socket */
if (-1 == (fcgi_fd = socket(socket_type, SOCK_STREAM, 0))) {
fprintf(stderr, "%s.%d\n",
__FILE__, __LINE__);
return -1;
}
val = 1;
if (setsockopt(fcgi_fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0) {
fprintf(stderr, "%s.%d\n",
__FILE__, __LINE__);
return -1;
}
/* create socket */
if (-1 == bind(fcgi_fd, fcgi_addr, servlen)) {
fprintf(stderr, "%s.%d: bind failed: %s\n",
__FILE__, __LINE__,
strerror(errno));
return -1;
}
if (-1 == listen(fcgi_fd, 1024)) {
fprintf(stderr, "%s.%d: fd = -1\n",
__FILE__, __LINE__);
return -1;
}
switch ((child = fork())) {
case 0: {
char cgi_childs[64];
char *b;
int i = 0;
/* is save as we limit to 256 childs */
sprintf(cgi_childs, "PHP_FCGI_CHILDREN=%d", child_count);
if(fcgi_fd != FCGI_LISTENSOCK_FILENO) {
close(FCGI_LISTENSOCK_FILENO);
dup2(fcgi_fd, FCGI_LISTENSOCK_FILENO);
close(fcgi_fd);
}
/* we don't need the client socket */
for (i = 3; i < 256; i++) {
close(i);
}
/* create environment */
putenv(cgi_childs);
/* fork and replace shell */
b = malloc(strlen("exec ") + strlen(appPath) + 1);
strcpy(b, "exec ");
strcat(b, appPath);
/* exec the cgi */
execl("/bin/sh", "sh", "-c", b, NULL);
exit(errno);
break;
}
case -1:
/* error */
break;
default:
/* father */
/* wait */
select(0, NULL, NULL, NULL, &tv);
switch (waitpid(child, &status, WNOHANG)) {
case 0:
fprintf(stderr, "%s.%d: child spawned successfully: PID: %d\n",
__FILE__, __LINE__,
child);
/* write pid file */
if (pid_fd != -1) {
/* assume a 32bit pid_t */
char pidbuf[12];
snprintf(pidbuf, sizeof(pidbuf) - 1, "%d", child);
write(pid_fd, pidbuf, strlen(pidbuf));
close(pid_fd);
pid_fd = -1;
}
break;
case -1:
break;
default:
if (WIFEXITED(status)) {
fprintf(stderr, "%s.%d: child exited with: %d, %s\n",
__FILE__, __LINE__,
WEXITSTATUS(status), strerror(WEXITSTATUS(status)));
} else if (WIFSIGNALED(status)) {
fprintf(stderr, "%s.%d: child signaled: %d\n",
__FILE__, __LINE__,
WTERMSIG(status));
} else {
fprintf(stderr, "%s.%d: child died somehow: %d\n",
__FILE__, __LINE__,
status);
}
}
break;
}
} else {
fprintf(stderr, "%s.%d: socket is already used, can't spawn\n",
__FILE__, __LINE__);
return -1;
}
close(fcgi_fd);
return 0;
}
void show_version () {
char *b = "spawn-fcgi" "-" PACKAGE_VERSION \
" - spawns fastcgi processes\n"
;
write(1, b, strlen(b));
}
void show_help () {
char *b = "spawn-fcgi" "-" PACKAGE_VERSION \
" - spawns fastcgi processes\n" \
"usage:\n" \
" -f <fcgiapp> filename of the fcgi-application\n" \
" -p <port> bind to tcp-port\n" \
" -s <path> bind to unix-domain socket\n" \
" -C <childs> (PHP only) numbers of childs to spawn (default 5)\n" \
" -P <path> name of PID-file for spawed process\n" \
" -v show version\n" \
" -h show this help\n" \
"(root only)\n" \
" -c <dir> chroot to directory\n" \
" -u <user> change to user-id\n" \
" -g <group> change to group-id\n" \
;
write(1, b, strlen(b));
}
int main(int argc, char **argv) {
char *fcgi_app = NULL, *changeroot = NULL, *username = NULL,
*groupname = NULL, *unixsocket = NULL, *pid_file = NULL;
unsigned short port = 0;
int child_count = 5;
int i_am_root, o;
int pid_fd = -1;
i_am_root = (getuid() == 0);
while(-1 != (o = getopt(argc, argv, "c:f:g:hp:u:vC:s:P:"))) {
switch(o) {
case 'f': fcgi_app = optarg; break;
case 'p': port = strtol(optarg, NULL, 10);/* port */ break;
case 'C': child_count = strtol(optarg, NULL, 10);/* */ break;
case 's': unixsocket = optarg; /* unix-domain socket */ break;
case 'c': if (i_am_root) { changeroot = optarg; }/* chroot() */ break;
case 'u': if (i_am_root) { username = optarg; } /* set user */ break;
case 'g': if (i_am_root) { groupname = optarg; } /* set group */ break;
case 'P': pid_file = optarg; /* PID file */ break;
case 'v': show_version(); return 0;
case 'h': show_help(); return 0;
default:
show_help();
return -1;
}
}
if (fcgi_app == NULL || (port == 0 && unixsocket == NULL)) {
show_help();
return -1;
}
if (unixsocket && port) {
fprintf(stderr, "%s.%d: %s\n",
__FILE__, __LINE__,
"either a unix domain socket or a tcp-port, but not both\n");
return -1;
}
if (unixsocket && strlen(unixsocket) > UNIX_PATH_MAX - 1) {
fprintf(stderr, "%s.%d: %s\n",
__FILE__, __LINE__,
"path of the unix socket is too long\n");
return -1;
}
/* UID handling */
if (!i_am_root && (geteuid() == 0 || getegid() == 0)) {
/* we are setuid-root */
fprintf(stderr, "%s.%d: %s\n",
__FILE__, __LINE__,
"Are you nuts ? Don't apply a SUID bit to this binary\n");
return -1;
}
if (pid_file &&
(-1 == (pid_fd = open(pid_file, O_WRONLY | O_CREAT | O_EXCL | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)))) {
struct stat st;
if (errno != EEXIST) {
fprintf(stderr, "%s.%d: opening pid-file '%s' failed: %s\n",
__FILE__, __LINE__,
pid_file, strerror(errno));
return -1;
}
/* ok, file exists */
if (0 != stat(pid_file, &st)) {
fprintf(stderr, "%s.%d: stating pid-file '%s' failed: %s\n",
__FILE__, __LINE__,
pid_file, strerror(errno));
return -1;
}
/* is it a regular file ? */
if (!S_ISREG(st.st_mode)) {
fprintf(stderr, "%s.%d: pid-file exists and isn't regular file: '%s'\n",
__FILE__, __LINE__,
pid_file);
return -1;
}
if (-1 == (pid_fd = open(pid_file, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH))) {
fprintf(stderr, "%s.%d: opening pid-file '%s' failed: %s\n",
__FILE__, __LINE__,
pid_file, strerror(errno));
return -1;
}
}
if (i_am_root) {
struct group *grp = NULL;
struct passwd *pwd = NULL;
/* set user and group */
if (username) {
if (NULL == (pwd = getpwnam(username))) {
fprintf(stderr, "%s.%d: %s, %s\n",
__FILE__, __LINE__,
"can't find username", username);
return -1;
}
if (pwd->pw_uid == 0) {
fprintf(stderr, "%s.%d: %s\n",
__FILE__, __LINE__,
"I will not set uid to 0\n");
return -1;
}
}
if (groupname) {
if (NULL == (grp = getgrnam(groupname))) {
fprintf(stderr, "%s.%d: %s %s\n",
__FILE__, __LINE__,
"can't find groupname",
groupname);
return -1;
}
if (grp->gr_gid == 0) {
fprintf(stderr, "%s.%d: %s\n",
__FILE__, __LINE__,
"I will not set gid to 0\n");
return -1;
}
}
if (changeroot) {
if (-1 == chroot(changeroot)) {
fprintf(stderr, "%s.%d: %s %s\n",
__FILE__, __LINE__,
"chroot failed: ", strerror(errno));
return -1;
}
if (-1 == chdir("/")) {
fprintf(stderr, "%s.%d: %s %s\n",
__FILE__, __LINE__,
"chdir failed: ", strerror(errno));
return -1;
}
}
/* drop root privs */
if (groupname) {
setgid(grp->gr_gid);
setgroups(0, NULL);
}
if (username) setuid(pwd->pw_uid);
}
return fcgi_spawn_connection(fcgi_app, port, unixsocket, child_count, pid_fd);
}
#else
int main() {
return -1;
}
#endif