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lighttpd1.4/src/fdevent.c

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#include "first.h"
#include "fdevent.h"
#include "buffer.h"
#include "log.h"
#include <sys/types.h>
#include "sys-socket.h"
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#ifdef _WIN32
#include <sys/stat.h> /* _S_IREAD _S_IWRITE */
#include <io.h>
#include <share.h> /* _SH_DENYRW */
#include <winsock2.h>
#endif
#ifdef SOCK_CLOEXEC
static int use_sock_cloexec;
#endif
#ifdef SOCK_NONBLOCK
static int use_sock_nonblock;
#endif
void fdevent_socket_nb_cloexec_init (void)
{
#ifdef SOCK_CLOEXEC
/* Test if SOCK_CLOEXEC is supported by kernel.
* Linux kernels < 2.6.27 might return EINVAL if SOCK_CLOEXEC used
* https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=529929
* http://www.linksysinfo.org/index.php?threads/lighttpd-no-longer-starts-toastman-1-28-0510-7.73132/
* Test if SOCK_NONBLOCK is ignored by kernel on sockets.
* (reported on Android running a custom ROM)
* https://redmine.lighttpd.net/issues/2883
*/
#ifdef SOCK_NONBLOCK
int fd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
#else
int fd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);
#endif
if (fd >= 0) {
int flags = fcntl(fd, F_GETFL, 0);
#ifdef SOCK_NONBLOCK
use_sock_nonblock = (-1 != flags && (flags & O_NONBLOCK));
#endif
use_sock_cloexec = 1;
close(fd);
}
#endif
}
void fdevent_setfd_cloexec(int fd) {
#ifdef FD_CLOEXEC
if (fd < 0) return;
force_assert(-1 != fcntl(fd, F_SETFD, FD_CLOEXEC));
#else
UNUSED(fd);
#endif
}
void fdevent_clrfd_cloexec(int fd) {
#ifdef FD_CLOEXEC
if (fd >= 0) force_assert(-1 != fcntl(fd, F_SETFD, 0));
#else
UNUSED(fd);
#endif
}
int fdevent_fcntl_set_nb(int fd) {
#ifdef O_NONBLOCK
return fcntl(fd, F_SETFL, O_NONBLOCK | O_RDWR);
#else
UNUSED(fd);
return 0;
#endif
}
int fdevent_fcntl_set_nb_cloexec(int fd) {
fdevent_setfd_cloexec(fd);
return fdevent_fcntl_set_nb(fd);
}
int fdevent_fcntl_set_nb_cloexec_sock(int fd) {
#if defined(SOCK_CLOEXEC) && defined(SOCK_NONBLOCK)
if (use_sock_cloexec && use_sock_nonblock)
return 0;
#endif
return fdevent_fcntl_set_nb_cloexec(fd);
}
int fdevent_socket_cloexec(int domain, int type, int protocol) {
int fd;
#ifdef SOCK_CLOEXEC
if (use_sock_cloexec)
return socket(domain, type | SOCK_CLOEXEC, protocol);
#endif
if (-1 != (fd = socket(domain, type, protocol))) {
#ifdef FD_CLOEXEC
force_assert(-1 != fcntl(fd, F_SETFD, FD_CLOEXEC));
#endif
}
return fd;
}
int fdevent_socket_nb_cloexec(int domain, int type, int protocol) {
int fd;
#ifdef SOCK_CLOEXEC
#ifdef SOCK_NONBLOCK
if (use_sock_cloexec && use_sock_nonblock)
return socket(domain, type | SOCK_CLOEXEC | SOCK_NONBLOCK, protocol);
#else
if (use_sock_cloexec) {
fd = socket(domain, type | SOCK_CLOEXEC, protocol);
#ifdef O_NONBLOCK
if (-1 != fd) force_assert(-1 != fcntl(fd,F_SETFL,O_NONBLOCK|O_RDWR));
#endif
return fd;
}
#endif
#endif
if (-1 != (fd = socket(domain, type, protocol))) {
#ifdef FD_CLOEXEC
force_assert(-1 != fcntl(fd, F_SETFD, FD_CLOEXEC));
#endif
#ifdef O_NONBLOCK
force_assert(-1 != fcntl(fd, F_SETFL, O_NONBLOCK | O_RDWR));
#endif
}
return fd;
}
int fdevent_dup_cloexec (int fd) {
#ifdef F_DUPFD_CLOEXEC
return fcntl(fd, F_DUPFD_CLOEXEC, 3);
#else
const int newfd = fcntl(fd, F_DUPFD, 3);
if (newfd >= 0) fdevent_setfd_cloexec(newfd);
return newfd;
#endif
}
#ifndef O_BINARY
#define O_BINARY 0
#endif
#ifndef O_LARGEFILE
#define O_LARGEFILE 0
#endif
#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif
#ifndef O_NOFOLLOW
#define O_NOFOLLOW 0
#endif
/*(O_NOFOLLOW is not handled here)*/
/*(Note: O_NOFOLLOW affects only the final path segment, the target file,
* not any intermediate symlinks along the path)*/
/* O_CLOEXEC handled further below, if defined) */
#ifdef O_NONBLOCK
#define FDEVENT_O_FLAGS \
(O_BINARY | O_LARGEFILE | O_NOCTTY | O_NONBLOCK)
#else
#define FDEVENT_O_FLAGS \
(O_BINARY | O_LARGEFILE | O_NOCTTY )
#endif
int fdevent_open_cloexec(const char *pathname, int symlinks, int flags, mode_t mode) {
if (!symlinks) flags |= O_NOFOLLOW;
#ifdef O_CLOEXEC
return open(pathname, flags | O_CLOEXEC | FDEVENT_O_FLAGS, mode);
#else
int fd = open(pathname, flags | FDEVENT_O_FLAGS, mode);
#ifdef FD_CLOEXEC
if (fd != -1)
force_assert(-1 != fcntl(fd, F_SETFD, FD_CLOEXEC));
#endif
return fd;
#endif
}
int fdevent_open_devnull(void) {
#if defined(_WIN32)
return fdevent_open_cloexec("nul", 0, O_RDWR, 0);
#elif defined(__sun) /* /dev/null is a symlink on Illumos */
return fdevent_open_cloexec("/dev/null", 1, O_RDWR, 0);
#else
return fdevent_open_cloexec("/dev/null", 0, O_RDWR, 0);
#endif
}
int fdevent_open_dirname(char *path, int symlinks) {
/*(handle special cases of no dirname or dirname is root directory)*/
char * const c = strrchr(path, '/');
const char * const dname = (NULL != c ? c == path ? "/" : path : ".");
int dfd;
int flags = O_RDONLY;
#ifdef O_DIRECTORY
flags |= O_DIRECTORY;
#endif
if (NULL != c) *c = '\0';
dfd = fdevent_open_cloexec(dname, symlinks, flags, 0);
if (NULL != c) *c = '/';
return dfd;
}
#ifdef _WIN32
#include <stdio.h>
#endif
int fdevent_pipe_cloexec (int * const fds, const unsigned int bufsz_hint) {
#ifdef _WIN32
return _pipe(fds, bufsz_hint, _O_BINARY | _O_NOINHERIT);
#else
#ifdef HAVE_PIPE2
if (0 != pipe2(fds, O_CLOEXEC))
#endif
{
if (0 != pipe(fds)
#ifdef FD_CLOEXEC
|| 0 != fcntl(fds[0], F_SETFD, FD_CLOEXEC)
|| 0 != fcntl(fds[1], F_SETFD, FD_CLOEXEC)
#endif
)
return -1;
}
#ifdef F_SETPIPE_SZ
if (bufsz_hint > 65536)
if (0 != fcntl(fds[1], F_SETPIPE_SZ, bufsz_hint)) { } /*(ignore error)*/
#else
UNUSED(bufsz_hint);
#endif
return 0;
#endif
}
int fdevent_mkostemp(char *path, int flags) {
#ifdef _WIN32
/* future: if _sopen_s() returns EEXIST, might reset template (path) with
* trailing "XXXXXX", and then loop to try again */
int fd; /*(flags might have _O_APPEND)*/
return (0 == _mktemp_s(path, strlen(path)+1))
&& (0 == _sopen_s(&fd, path, _O_CREAT | _O_EXCL | _O_TEMPORARY
| flags | _O_BINARY | _O_NOINHERIT,
_SH_DENYRW, _S_IREAD | _S_IWRITE))
? fd
: -1;
#elif defined(HAVE_MKOSTEMP)
return mkostemp(path, O_CLOEXEC | flags);
#else
#ifdef __COVERITY__
/* POSIX-2008 requires mkstemp create file with 0600 perms */
umask(0600);
#endif
/* coverity[secure_temp : FALSE] */
const int fd = mkstemp(path);
if (fd < 0) return fd;
if (flags && 0 != fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | flags)) {
/* (should not happen; fd is regular file) */
int errnum = errno;
close(fd);
errno = errnum;
return -1;
}
fdevent_setfd_cloexec(fd);
return fd;
#endif
}
int fdevent_accept_listenfd(int listenfd, struct sockaddr *addr, size_t *addrlen) {
int fd;
socklen_t len = (socklen_t) *addrlen;
#if defined(SOCK_CLOEXEC) && defined(SOCK_NONBLOCK)
#if defined(__NetBSD__)
const int sock_cloexec = 1;
fd = paccept(listenfd, addr, &len, NULL, SOCK_CLOEXEC | SOCK_NONBLOCK);
#else
int sock_cloexec = use_sock_cloexec;
if (sock_cloexec) {
fd = accept4(listenfd, addr, &len, SOCK_CLOEXEC | SOCK_NONBLOCK);
if (fd >= 0) {
if (!use_sock_nonblock) {
if (0 != fdevent_fcntl_set_nb(fd)) {
close(fd);
fd = -1;
}
}
}
else {
switch (errno) {
case ENOSYS:
case ENOTSUP:
case EPERM:
fd = accept(listenfd, addr, &len);
sock_cloexec = 0;
break;
default:
break;
}
}
}
else {
fd = accept(listenfd, addr, &len);
}
#endif
#else
const int sock_cloexec = 0;
fd = accept(listenfd, addr, &len);
#endif
if (fd >= 0) {
*addrlen = (size_t)len;
if (!sock_cloexec && 0 != fdevent_fcntl_set_nb_cloexec(fd)) {
close(fd);
fd = -1;
}
}
return fd;
}
#ifdef __APPLE__
#include <crt_externs.h>
#define environ (* _NSGetEnviron())
#else
extern char **environ;
#endif
char ** fdevent_environ (void) { return environ; }
#ifdef FD_CLOEXEC
static int fdevent_dup2_close_clrfd_cloexec(int oldfd, int newfd) {
if (oldfd >= 0) {
if (oldfd != newfd) {
force_assert(oldfd > STDERR_FILENO);
if (newfd != dup2(oldfd, newfd)) return -1;
}
else {
fdevent_clrfd_cloexec(newfd);
}
}
return newfd;
}
#else
static int fdevent_dup2_close_clrfd_cloexec(int oldfd, int newfd, int reuse) {
if (oldfd >= 0) {
if (oldfd != newfd) {
force_assert(oldfd > STDERR_FILENO);
if (newfd != dup2(oldfd, newfd)) return -1;
if (!reuse) close(oldfd);
}
}
return newfd;
}
#endif
int fdevent_set_stdin_stdout_stderr(int fdin, int fdout, int fderr) {
#ifdef FD_CLOEXEC
if (STDIN_FILENO != fdevent_dup2_close_clrfd_cloexec(fdin, STDIN_FILENO))
return -1;
if (STDOUT_FILENO != fdevent_dup2_close_clrfd_cloexec(fdout, STDOUT_FILENO))
return -1;
if (STDERR_FILENO != fdevent_dup2_close_clrfd_cloexec(fderr, STDERR_FILENO))
return -1;
#else
if (STDIN_FILENO != fdevent_dup2_close_clrfd_cloexec(fdin, STDIN_FILENO,
fdin == fdout
|| fdin == fderr))
return -1;
if (STDOUT_FILENO != fdevent_dup2_close_clrfd_cloexec(fdout, STDOUT_FILENO,
fdout == fderr))
return -1;
if (STDERR_FILENO != fdevent_dup2_close_clrfd_cloexec(fderr, STDERR_FILENO,
0))
return -1;
#endif
return 0;
}
#include <stdio.h> /* perror() rename() */
#include <signal.h> /* signal() */
int fdevent_rename(const char *oldpath, const char *newpath) {
return rename(oldpath, newpath);
}
pid_t fdevent_fork_execve(const char *name, char *argv[], char *envp[], int fdin, int fdout, int fderr, int dfd) {
#ifdef HAVE_FORK
pid_t pid = fork();
if (0 != pid) return pid; /* parent (pid > 0) or fork() error (-1 == pid) */
/* child (0 == pid) */
if (-1 != dfd) {
if (0 != fchdir(dfd))
_exit(errno);
close(dfd);
}
if (0 != fdevent_set_stdin_stdout_stderr(fdin, fdout, fderr)) _exit(errno);
#ifndef FD_CLOEXEC
/*(might not be sufficient for open fds, but modern OS have FD_CLOEXEC)*/
for (int i = 3; i < 256; ++i) close(i);
#endif
/* reset_signals which may have been ignored (SIG_IGN) */
#ifdef SIGTTOU
signal(SIGTTOU, SIG_DFL);
#endif
#ifdef SIGTTIN
signal(SIGTTIN, SIG_DFL);
#endif
#ifdef SIGTSTP
signal(SIGTSTP, SIG_DFL);
#endif
signal(SIGPIPE, SIG_DFL);
execve(name, argv, envp ? envp : environ);
int errnum = errno;
int argnum =
(0 == strcmp(argv[0], "/bin/sh") && argv[1] && 0 == strcmp(argv[1], "-c"))
? 2
: 0;
perror(argv[argnum]);
_exit(errnum);
#else
UNUSED(name);
UNUSED(argv);
UNUSED(envp);
UNUSED(fdin);
UNUSED(fdout);
UNUSED(fderr);
UNUSED(dfd);
return (pid_t)-1;
#endif
}
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
int fdevent_waitpid(pid_t pid, int * const status, int nb) {
const int flags = nb ? WNOHANG : 0;
pid_t rv;
do { rv = waitpid(pid, status, flags); } while (-1 == rv && errno == EINTR);
return rv;
}
int fdevent_waitpid_intr(pid_t pid, int * const status) {
return waitpid(pid, status, 0);
}
#ifndef MSG_DONTWAIT
#define MSG_DONTWAIT 0
#endif
#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif
ssize_t fdevent_socket_read_discard (int fd, char *buf, size_t sz, int family, int so_type) {
#if defined(MSG_TRUNC) && defined(__linux__)
if ((family == AF_INET || family == AF_INET6) && so_type == SOCK_STREAM) {
ssize_t len = recv(fd, buf, sz, MSG_TRUNC|MSG_DONTWAIT|MSG_NOSIGNAL);
if (len >= 0 || errno != EINVAL) return len;
}
#else
UNUSED(family);
UNUSED(so_type);
#endif
return read(fd, buf, sz);
}
#include <sys/ioctl.h>
#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h> /* FIONREAD (for illumos (OpenIndiana)) */
#endif
#ifdef _WIN32
#include <winsock2.h>
#endif
int fdevent_ioctl_fionread (int fd, int fdfmt, int *toread) {
#ifdef _WIN32
if (fdfmt != S_IFSOCK) { errno = ENOTSOCK; return -1; }
return ioctlsocket(fd, FIONREAD, toread);
#else
#ifdef __CYGWIN__
/*(cygwin supports FIONREAD on pipes, not sockets)*/
if (fdfmt != S_IFIFO) { errno = EOPNOTSUPP; return -1; }
#else
UNUSED(fdfmt);
#endif
return ioctl(fd, FIONREAD, toread);
#endif
}
int fdevent_connect_status(int fd) {
/* try to finish the connect() */
/*(should be called after connect() only when fd is writable (POLLOUT))*/
int opt;
socklen_t len = sizeof(opt);
return (0 == getsockopt(fd,SOL_SOCKET,SO_ERROR,&opt,&len)) ? opt : errno;
}
#include <netinet/tcp.h>
#if (defined(__APPLE__) && defined(__MACH__)) \
|| defined(__FreeBSD__) || defined(__NetBSD__) \
|| defined(__OpenBSD__) || defined(__DragonFly__)
#include <netinet/tcp_fsm.h>
#endif
/* fd must be TCP socket (AF_INET, AF_INET6), end-of-stream recv() 0 bytes */
int fdevent_is_tcp_half_closed(int fd) {
#ifdef TCP_CONNECTION_INFO /* Darwin */
struct tcp_connection_info tcpi;
socklen_t tlen = sizeof(tcpi);
return (0 == getsockopt(fd, IPPROTO_TCP, TCP_CONNECTION_INFO, &tcpi, &tlen)
&& tcpi.tcpi_state == TCPS_CLOSE_WAIT);
#elif defined(TCP_INFO) && defined(TCPS_CLOSE_WAIT)
/* FreeBSD, NetBSD (not present in OpenBSD or DragonFlyBSD) */
struct tcp_info tcpi;
socklen_t tlen = sizeof(tcpi);
return (0 == getsockopt(fd, IPPROTO_TCP, TCP_INFO, &tcpi, &tlen)
&& tcpi.tcpi_state == TCPS_CLOSE_WAIT);
#elif defined(TCP_INFO) && defined(__linux__)
/* Linux (TCP_CLOSE_WAIT is enum, so can not #ifdef TCP_CLOSE_WAIT) */
struct tcp_info tcpi;
socklen_t tlen = sizeof(tcpi);/*SOL_TCP == IPPROTO_TCP*/
return (0 == getsockopt(fd, SOL_TCP, TCP_INFO, &tcpi, &tlen)
&& tcpi.tcpi_state == TCP_CLOSE_WAIT);
#else
UNUSED(fd);
/*(0 != getpeername() error might indicate TCP RST, but success
* would not differentiate between half-close and full-close)*/
return 0; /* false (not half-closed) or TCP state unknown */
#endif
}
int fdevent_set_tcp_nodelay (const int fd, const int opt)
{
return setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
}
int fdevent_set_so_reuseaddr (const int fd, const int opt)
{
return setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
}
#include <sys/stat.h>
#include "ck.h"
__attribute_cold__ /*(convenience routine for use at config at startup)*/
char *
fdevent_load_file (const char * const fn, off_t *lim, log_error_st *errh, void *(malloc_fn)(size_t), void(free_fn)(void *))
{
int fd;
off_t sz = 0;
char *buf = NULL;
do {
fd = fdevent_open_cloexec(fn, 1, O_RDONLY, 0); /*(1: follows symlinks)*/
if (fd < 0) break;
struct stat st;
if (0 != fstat(fd, &st)) break;
if ((sizeof(off_t) > sizeof(size_t) && st.st_size >= (off_t)~(size_t)0u)
|| (*lim != 0 && st.st_size >= *lim)) {
errno = EOVERFLOW;
break;
}
sz = st.st_size;
buf = malloc_fn((size_t)sz+1);/*+1 trailing '\0' for str funcs on data*/
if (NULL == buf) break;
if (sz) {
ssize_t rd = 0;
off_t off = 0;
do {
rd = read(fd, buf+off, (size_t)(sz-off));
} while (rd > 0 ? (off += rd) != sz : rd < 0 && errno == EINTR);
if (off != sz) { /*(file truncated?)*/
if (rd >= 0) errno = EIO;
break;
}
}
buf[sz] = '\0';
*lim = sz;
close(fd);
return buf;
} while (0);
int errnum = errno;
if (errh)
log_perror(errh, __FILE__, __LINE__, "%s() %s", __func__, fn);
if (fd >= 0) close(fd);
if (buf) {
ck_memzero(buf, (size_t)sz);
free_fn(buf);
}
*lim = 0;
errno = errnum;
return NULL;
}
int
fdevent_load_file_bytes (char * const buf, const off_t sz, off_t off, const char * const fn, log_error_st *errh)
{
int fd;
do {
fd = fdevent_open_cloexec(fn, 1, O_RDONLY, 0); /*(1: follows symlinks)*/
if (fd < 0) break;
if (0 != off && (off_t)-1 == lseek(fd, off, SEEK_SET)) break;
off = 0;
ssize_t rd = 0;
do {
rd = read(fd, buf+off, (size_t)(sz-off));
} while (rd > 0 ? (off += rd) != sz : rd < 0 && errno == EINTR);
if (off != sz) { /*(file truncated? or incorrect sz requested)*/
if (rd >= 0) errno = EIO;
break;
}
close(fd);
return 0;
} while (0);
int errnum = errno;
if (errh)
log_perror(errh, __FILE__, __LINE__, "%s() %s", __func__, fn);
if (fd >= 0) close(fd);
ck_memzero(buf, (size_t)sz);
errno = errnum;
return -1;
}