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Diffstat (limited to 'networking')
-rw-r--r--networking/inetd.c296
1 files changed, 151 insertions, 145 deletions
diff --git a/networking/inetd.c b/networking/inetd.c
index d6265d8..8c8843b 100644
--- a/networking/inetd.c
+++ b/networking/inetd.c
@@ -183,8 +183,7 @@ static struct rlimit rlim_ofile;
# define INETD_SETPROCTITLE
#endif
-typedef struct servtab
-{
+typedef struct servtab {
char *se_hostaddr; /* host address to listen on */
char *se_service; /* name of service */
int se_socktype; /* type of socket to use */
@@ -209,8 +208,7 @@ typedef struct servtab
#define MAXARGV 20
char *se_argv[MAXARGV + 1]; /* program arguments */
int se_fd; /* open descriptor */
- union
- {
+ union {
struct sockaddr se_un_ctrladdr;
struct sockaddr_in se_un_ctrladdr_in;
#ifdef CONFIG_FEATURE_IPV6
@@ -232,8 +230,7 @@ typedef struct servtab
static servtab_t *servtab;
#ifdef INETD_FEATURE_ENABLED
-struct builtin
-{
+struct builtin {
const char *bi_service; /* internally provided service name */
int bi_socktype; /* type of socket supported */
short bi_fork; /* 1 if should fork before call */
@@ -427,7 +424,8 @@ static void setup(servtab_t *sep)
int on = 1;
int r;
- if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) {
+ sep->se_fd = socket(sep->se_family, sep->se_socktype, 0);
+ if (sep->se_fd < 0) {
bb_perror_msg("%s/%s: socket", sep->se_service, sep->se_proto);
return;
}
@@ -1355,7 +1353,7 @@ inetd_main(int argc, char *argv[])
}
readable = allsock;
- n = select(maxsock + 1, &readable, NULL, NULL, NULL)
+ n = select(maxsock + 1, &readable, NULL, NULL, NULL);
if (n <= 0) {
if (n < 0 && errno != EINTR) {
bb_perror_msg("select");
@@ -1363,154 +1361,154 @@ inetd_main(int argc, char *argv[])
}
continue;
}
+
for (sep = servtab; n && sep; sep = sep->se_next) {
- // TODO: undo this unholy mess
- if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
- n--;
- if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) {
- ctrl = accept(sep->se_fd, NULL, NULL);
- if (ctrl < 0) {
- if (errno == EINTR)
- continue;
- bb_perror_msg("accept (for %s)", sep->se_service);
+ if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
+ continue;
+
+ n--;
+ if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) {
+ ctrl = accept(sep->se_fd, NULL, NULL);
+ if (ctrl < 0) {
+ if (errno == EINTR)
+ continue;
+ bb_perror_msg("accept (for %s)", sep->se_service);
+ continue;
+ }
+ if (sep->se_family == AF_INET && sep->se_socktype == SOCK_STREAM) {
+ struct sockaddr_in peer;
+ socklen_t plen = sizeof(peer);
+
+ if (getpeername(ctrl, (struct sockaddr *) &peer, &plen) < 0) {
+ bb_error_msg("could not getpeername");
+ close(ctrl);
continue;
}
- if (sep->se_family == AF_INET && sep->se_socktype == SOCK_STREAM) {
- struct sockaddr_in peer;
- socklen_t plen = sizeof(peer);
+ if (ntohs(peer.sin_port) == 20) {
+ /* XXX ftp bounce */
+ close(ctrl);
+ continue;
+ }
+ }
+ } else
+ ctrl = sep->se_fd;
- if (getpeername(ctrl, (struct sockaddr *) &peer, &plen) < 0) {
- bb_error_msg("could not getpeername");
+ Block_Using_Signals(omask);
+ pid = 0;
+#ifdef INETD_FEATURE_ENABLED
+ if (sep->se_bi == 0 || sep->se_bi->bi_fork)
+#endif
+ {
+ if (sep->se_count++ == 0)
+ (void) gettimeofday(&sep->se_time, NULL);
+ else if (toomany > 0 && sep->se_count >= sep->se_max) {
+ struct timeval now;
+
+ (void) gettimeofday(&now, NULL);
+ if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) {
+ sep->se_time = now;
+ sep->se_count = 1;
+ } else {
+ if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
close(ctrl);
+ if (sep->se_family == AF_INET &&
+ ntohs(sep->se_ctrladdr_in.sin_port) >= IPPORT_RESERVED) {
+ /*
+ * Cannot close it -- there are
+ * thieves on the system.
+ * Simply ignore the connection.
+ */
+ --sep->se_count;
continue;
}
- if (ntohs(peer.sin_port) == 20) {
- /* XXX ftp bounce */
+ bb_error_msg("%s/%s server failing (looping), service terminated",
+ sep->se_service, sep->se_proto);
+ if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
close(ctrl);
- continue;
- }
- }
- } else
- ctrl = sep->se_fd;
- Block_Using_Signals(omask);
- pid = 0;
-#ifdef INETD_FEATURE_ENABLED
- if (sep->se_bi == 0 || sep->se_bi->bi_fork)
-#endif
- {
- if (sep->se_count++ == 0)
- (void) gettimeofday(&sep->se_time, NULL);
- else if (toomany > 0 && sep->se_count >= sep->se_max) {
- struct timeval now;
-
- (void) gettimeofday(&now, NULL);
- if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) {
- sep->se_time = now;
- sep->se_count = 1;
- } else {
- if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
- close(ctrl);
- if (sep->se_family == AF_INET &&
- ntohs(sep->se_ctrladdr_in.sin_port) >= IPPORT_RESERVED) {
- /*
- * Cannot close it -- there are
- * thieves on the system.
- * Simply ignore the connection.
- */
- --sep->se_count;
- continue;
- }
- bb_error_msg("%s/%s server failing (looping), service terminated",
- sep->se_service, sep->se_proto);
- if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
- close(ctrl);
- FD_CLR(sep->se_fd, &allsock);
- (void) close(sep->se_fd);
- sep->se_fd = -1;
- sep->se_count = 0;
- nsock--;
- sigprocmask(SIG_UNBLOCK, &omask, NULL);
- if (!timingout) {
- timingout = 1;
- alarm(RETRYTIME);
- }
- continue;
+ FD_CLR(sep->se_fd, &allsock);
+ (void) close(sep->se_fd);
+ sep->se_fd = -1;
+ sep->se_count = 0;
+ nsock--;
+ sigprocmask(SIG_UNBLOCK, &omask, NULL);
+ if (!timingout) {
+ timingout = 1;
+ alarm(RETRYTIME);
}
+ continue;
}
- pid = fork();
- }
- if (pid < 0) {
- bb_perror_msg("fork");
- if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
- close(ctrl);
- sigprocmask(SIG_UNBLOCK, &omask, NULL);
- sleep(1);
- continue;
- }
- if (pid && sep->se_wait) {
- sep->se_wait = pid;
- FD_CLR(sep->se_fd, &allsock);
- nsock--;
}
+ pid = fork();
+ }
+ if (pid < 0) {
+ bb_perror_msg("fork");
+ if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
+ close(ctrl);
sigprocmask(SIG_UNBLOCK, &omask, NULL);
- if (pid == 0) {
+ sleep(1);
+ continue;
+ }
+ if (pid && sep->se_wait) {
+ sep->se_wait = pid;
+ FD_CLR(sep->se_fd, &allsock);
+ nsock--;
+ }
+ sigprocmask(SIG_UNBLOCK, &omask, NULL);
+ if (pid == 0) {
#ifdef INETD_FEATURE_ENABLED
- if (sep->se_bi) {
- (*sep->se_bi->bi_fn)(ctrl, sep);
- } else
+ if (sep->se_bi) {
+ (*sep->se_bi->bi_fn)(ctrl, sep);
+ } else
#endif
- {
- if ((pwd = getpwnam(sep->se_user)) == NULL) {
- bb_error_msg("getpwnam: %s: no such user", sep->se_user);
- if (sep->se_socktype != SOCK_STREAM)
- recv(0, buf, sizeof(buf), 0);
- _exit(1);
- }
- if (setsid() < 0)
- bb_perror_msg("%s: setsid", sep->se_service);
- if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
- bb_error_msg("getgrnam: %s: no such group", sep->se_group);
- if (sep->se_socktype != SOCK_STREAM)
- recv(0, buf, sizeof(buf), 0);
+ {
+ pwd = getpwnam(sep->se_user);
+ if (pwd == NULL) {
+ bb_error_msg("getpwnam: %s: no such user", sep->se_user);
+ goto do_exit1;
+ }
+ if (setsid() < 0)
+ bb_perror_msg("%s: setsid", sep->se_service);
+ if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
+ bb_error_msg("getgrnam: %s: no such group", sep->se_group);
+ goto do_exit1;
+ }
+ if (uid != 0) {
+ /* a user running private inetd */
+ if (uid != pwd->pw_uid)
_exit(1);
- }
- if (uid != 0) {
- /* a user running private inetd */
- if (uid != pwd->pw_uid)
- _exit(1);
- } else if (pwd->pw_uid) {
- if (sep->se_group)
- pwd->pw_gid = grp->gr_gid;
- xsetgid((gid_t) pwd->pw_gid);
- initgroups(pwd->pw_name, pwd->pw_gid);
- xsetuid((uid_t) pwd->pw_uid);
- } else if (sep->se_group) {
- xsetgid(grp->gr_gid);
- setgroups(1, &grp->gr_gid);
- }
- dup2(ctrl, 0);
- close(ctrl);
- dup2(0, 1);
- dup2(0, 2);
- if (rlim_ofile.rlim_cur != rlim_ofile_cur)
- if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
- bb_perror_msg("setrlimit");
- closelog();
- for (tmpint = rlim_ofile_cur - 1; --tmpint > 2;)
- (void) close(tmpint);
- sigaction(SIGPIPE, &sapipe, NULL);
- execv(sep->se_server, sep->se_argv);
- if (sep->se_socktype != SOCK_STREAM)
- recv(0, buf, sizeof(buf), 0);
- bb_perror_msg("execv %s", sep->se_server);
- _exit(1);
+ } else if (pwd->pw_uid) {
+ if (sep->se_group)
+ pwd->pw_gid = grp->gr_gid;
+ xsetgid((gid_t) pwd->pw_gid);
+ initgroups(pwd->pw_name, pwd->pw_gid);
+ xsetuid((uid_t) pwd->pw_uid);
+ } else if (sep->se_group) {
+ xsetgid(grp->gr_gid);
+ setgroups(1, &grp->gr_gid);
}
+ dup2(ctrl, 0);
+ if (ctrl) close(ctrl);
+ dup2(0, 1);
+ dup2(0, 2);
+ if (rlim_ofile.rlim_cur != rlim_ofile_cur)
+ if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
+ bb_perror_msg("setrlimit");
+ closelog();
+ for (tmpint = rlim_ofile_cur - 1; --tmpint > 2;)
+ (void) close(tmpint);
+ sigaction(SIGPIPE, &sapipe, NULL);
+ execv(sep->se_server, sep->se_argv);
+ bb_perror_msg("execv %s", sep->se_server);
+do_exit1:
+ if (sep->se_socktype != SOCK_STREAM)
+ recv(0, buf, sizeof(buf), 0);
+ _exit(1);
}
- if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
- close(ctrl);
}
- }
- }
+ if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
+ close(ctrl);
+ } /* for (sep = servtab...) */
+ } /* for(;;) */
}
/*
@@ -1542,8 +1540,12 @@ echo_stream(int s, servtab_t *sep)
int i;
inetd_setproctitle(sep->se_service, s);
- while ((i = read(s, buffer, sizeof(buffer))) > 0 &&
- write(s, buffer, i) > 0);
+ while (1) {
+ i = read(s, buffer, sizeof(buffer));
+ if (i <= 0) break;
+ /* FIXME: this isnt correct - safe_write()? */
+ if (write(s, buffer, i) <= 0) break;
+ }
exit(0);
}
@@ -1577,9 +1579,11 @@ discard_stream(int s, servtab_t *sep)
char buffer[BUFSIZE];
inetd_setproctitle(sep->se_service, s);
- while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) ||
- errno == EINTR);
- exit(0);
+ while (1) {
+ errno = 0;
+ if (read(s, buffer, sizeof(buffer)) <= 0 && errno != EINTR)
+ exit(0);
+ }
}
/* Discard service -- ignore data */
@@ -1629,8 +1633,10 @@ chargen_stream(int s, servtab_t *sep)
text[LINESIZ] = '\r';
text[LINESIZ + 1] = '\n';
- for (rs = ring;;) {
- if ((len = endring - rs) >= LINESIZ)
+ rs = ring;
+ for (;;) {
+ len = endring - rs;
+ if (len >= LINESIZ)
memmove(text, rs, LINESIZ);
else {
memmove(text, rs, len);
generated by cgit v1.1 at 2024-12-26 17:14:58 +0000