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Do not let sockets be inherited by sub-processes

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Set FD_CLOEXEC flag on tunnel and UDP file descriptors.
Fixes ticket #99, "should not allow UDP socket to be inherited by ifconfig"
This commit is contained in:
Erik Ekman 2014-06-04 17:40:36 +09:00
parent a23899513d
commit 3fadbfb580
4 changed files with 25 additions and 0 deletions
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1
CHANGELOG
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@ -23,6 +23,7 @@ master:
- A number of minor patches from Frank Denis, Gregor Herrmann and
Barak A. Pearlmutter.
- Testcase compilation fixes for OS X and FreeBSD
- Do not let sockets be inherited by sub-processes, fixes #99.
2010-02-06: 0.6.0-rc1 "Hotspotify"
- Fixed tunnel not working on Windows.

18
src/common.c
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@ -189,6 +189,8 @@ open_dns(struct sockaddr_storage *sockaddr, size_t sockaddr_len)
#ifndef WINDOWS32
/* To get destination address from each UDP datagram, see iodined.c:read_dns() */
setsockopt(fd, IPPROTO_IP, DSTADDR_SOCKOPT, (const void*) &flag, sizeof(flag));
fd_set_close_on_exec(fd);
#endif
#ifdef IP_OPT_DONT_FRAG
@ -461,3 +463,19 @@ int recent_seqno(int ourseqno, int gotseqno)
}
return 0;
}
/* Set FD_CLOEXEC flag on file descriptor.
* This stops it from being inherited by system() calls.
*/
void
fd_set_close_on_exec(int fd)
{
int flags;
flags = fcntl(fd, F_GETFD);
if (flags == -1)
err(4, "Failed to get fd flags");
flags |= FD_CLOEXEC;
if (fcntl(fd, F_SETFD, flags) == -1)
err(4, "Failed to set fd flags");
}

2
src/common.h
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@ -136,4 +136,6 @@ void warnx(const char *fmt, ...);
int recent_seqno(int , int);
void fd_set_close_on_exec(int fd);
#endif

4
src/tun.c
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@ -98,6 +98,7 @@ open_tun(const char *tun_device)
if (ioctl(tun_fd, TUNSETIFF, (void *) &ifreq) != -1) {
fprintf(stderr, "Opened %s\n", ifreq.ifr_name);
fd_set_close_on_exec(tun_fd);
return tun_fd;
}
@ -112,6 +113,7 @@ open_tun(const char *tun_device)
if (ioctl(tun_fd, TUNSETIFF, (void *) &ifreq) != -1) {
fprintf(stderr, "Opened %s\n", ifreq.ifr_name);
snprintf(if_name, sizeof(if_name), "dns%d", i);
fd_set_close_on_exec(tun_fd);
return tun_fd;
}
@ -147,6 +149,7 @@ open_tun(const char *tun_device)
}
fprintf(stderr, "Opened %s\n", tun_name);
fd_set_close_on_exec(tun_fd);
return tun_fd;
} else {
for (i = 0; i < TUN_MAX_TRY; i++) {
@ -155,6 +158,7 @@ open_tun(const char *tun_device)
if ((tun_fd = open(tun_name, O_RDWR)) >= 0) {
fprintf(stderr, "Opened %s\n", tun_name);
snprintf(if_name, sizeof(if_name), "tun%d", i);
fd_set_close_on_exec(tun_fd);
return tun_fd;
}