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Port lib/libc/net/h_dns_server to FreeBSD

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Submitted by: pho
This commit is contained in:
Enji Cooper 2014-11-01 17:14:29 +00:00
parent 0d913b6592
commit b0b9a540ca
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=273936
1 changed files with 117 additions and 0 deletions
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117
contrib/netbsd-tests/lib/libc/net/h_dns_server.c
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@ -49,7 +49,13 @@ __RCSID("$NetBSD: h_dns_server.c,v 1.4 2014/03/29 16:10:54 gson Exp $");
#include <sys/socket.h>
#include <netinet/in.h>
#ifdef __NetBSD__
#include <netinet6/in6.h>
#endif
#ifdef __FreeBSD__
#include <paths.h>
#endif
union sockaddr_either {
struct sockaddr s;
@ -164,6 +170,106 @@ name2str(const void *v, char *buf, size_t buflen) {
}
#endif
#ifdef __FreeBSD__
/* XXX the daemon2_* functions should be in a library */
int __daemon2_detach_pipe[2];
static int
daemon2_fork(void)
{
int r;
int fd;
int i;
/*
* Set up the pipe, making sure the write end does not
* get allocated one of the file descriptors that will
* be closed in daemon2_detach().
*/
for (i = 0; i < 3; i++) {
r = pipe(__daemon2_detach_pipe);
if (r < 0)
return -1;
if (__daemon2_detach_pipe[1] <= STDERR_FILENO &&
(fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
(void)dup2(fd, __daemon2_detach_pipe[0]);
(void)dup2(fd, __daemon2_detach_pipe[1]);
if (fd > STDERR_FILENO)
(void)close(fd);
continue;
}
break;
}
r = fork();
if (r < 0) {
return -1;
} else if (r == 0) {
/* child */
close(__daemon2_detach_pipe[0]);
return 0;
}
/* Parent */
(void) close(__daemon2_detach_pipe[1]);
for (;;) {
char dummy;
r = read(__daemon2_detach_pipe[0], &dummy, 1);
if (r < 0) {
if (errno == EINTR)
continue;
_exit(1);
} else if (r == 0) {
_exit(1);
} else { /* r > 0 */
_exit(0);
}
}
}
static int
daemon2_detach(int nochdir, int noclose)
{
int r;
int fd;
if (setsid() == -1)
return -1;
if (!nochdir)
(void)chdir("/");
if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
(void)dup2(fd, STDIN_FILENO);
(void)dup2(fd, STDOUT_FILENO);
(void)dup2(fd, STDERR_FILENO);
if (fd > STDERR_FILENO)
(void)close(fd);
}
while (1) {
r = write(__daemon2_detach_pipe[1], "", 1);
if (r < 0) {
if (errno == EINTR)
continue;
/* May get "broken pipe" here if parent is killed */
return -1;
} else if (r == 0) {
/* Should not happen */
return -1;
} else {
break;
}
}
(void) close(__daemon2_detach_pipe[1]);
return 0;
}
#endif
int main(int argc, char **argv) {
int s, r, protocol;
union sockaddr_either saddr;
@ -176,6 +282,9 @@ int main(int argc, char **argv) {
char buf1[1024], buf2[1024];
#endif
#ifdef __FreeBSD__
daemon2_fork();
#endif
if (argc < 2 || ((protocol = argv[1][0]) != '4' && protocol != '6'))
errx(1, "usage: dns_server 4 | 6");
s = socket(protocol == '4' ? PF_INET : PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
@ -212,10 +321,18 @@ int main(int argc, char **argv) {
f = fopen(pidfile_name, "w");
fprintf(f, "%d", getpid());
fclose(f);
#ifdef __FreeBSD__
#ifdef DEBUG
daemon2_detach(0, 1);
#else
daemon2_detach(0, 0);
#endif
#else
#ifdef DEBUG
daemon(0, 1);
#else
daemon(0, 0);
#endif
#endif
for (;;) {