Move all server helpers in util/server.c

2 files changed, 400 insertions, 161 deletions

diff --git a/server/util/become_daemon.c b/server/util/become_daemon.c
deleted file mode 100644
index 4a940eaa1..000000000
--- a/server/util/become_daemon.c
+++ /dev/null
@@ -1,161 +0,0 @@
-/* 
-   Unix SMB/CIFS implementation.
-   Samba utility functions
-   Copyright (C) Andrew Tridgell 1992-1998
-   Copyright (C) Jeremy Allison 2001-2002
-   Copyright (C) Simo Sorce 2001
-   Copyright (C) Jim McDonough (jmcd@us.ibm.com)  2003.
-   Copyright (C) James J Myers 2003
-   
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-   
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-   
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#define _GNU_SOURCE
-#include <stdio.h>
-#include <stdbool.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include "util/util.h"
-
-
-/*******************************************************************
- Close the low 3 fd's and open dev/null in their place.
-********************************************************************/
-static void close_low_fds(bool stderr_too)
-{
-#ifndef VALGRIND
-	int fd;
-	int i;
-
-	close(0);
-	close(1); 
-
-	if (stderr_too)
-		close(2);
-
-	/* try and use up these file descriptors, so silly
-		library routines writing to stdout etc won't cause havoc */
-	for (i=0;i<3;i++) {
-		if (i == 2 && !stderr_too)
-			continue;
-
-		fd = open("/dev/null",O_RDWR,0);
-		if (fd < 0)
-			fd = open("/dev/null",O_WRONLY,0);
-		if (fd < 0) {
-			DEBUG(0,("Can't open /dev/null\n"));
-			return;
-		}
-		if (fd != i) {
-			DEBUG(0,("Didn't get file descriptor %d\n",i));
-			return;
-		}
-	}
-#endif
-}
-
-/**
- Become a daemon, discarding the controlling terminal.
-**/
-
-void become_daemon(bool Fork)
-{
-	if (Fork) {
-		if (fork()) {
-			_exit(0);
-		}
-	}
-
-  /* detach from the terminal */
-#ifdef HAVE_SETSID
-	setsid();
-#elif defined(TIOCNOTTY)
-	{
-		int i = open("/dev/tty", O_RDWR, 0);
-		if (i != -1) {
-			ioctl(i, (int) TIOCNOTTY, (char *)0);      
-			close(i);
-		}
-	}
-#endif /* HAVE_SETSID */
-
-	/* Close fd's 0,1,2. Needed if started by rsh */
-	close_low_fds(false);  /* Don't close stderr, let the debug system
-				  attach it to the logfile */
-}
-
-int pidfile(const char *path, const char *name)
-{
-    char pid_str[32];
-    pid_t pid;
-    char *file;
-    int fd;
-    int ret;
-
-    asprintf(&file, "%s/%s.pid", path, name);
-
-    fd = open(file, O_RDONLY, 0644);
-    if (fd != -1) {
-
-        pid_str[sizeof(pid_str) -1] = '\0';
-        ret = read(fd, pid_str, sizeof(pid_str) -1);
-        if (ret > 0) {
-            /* let's check the pid */
-
-            pid = (pid_t)atoi(pid_str);
-            if (pid != 0) {
-                errno = 0;
-                ret = kill(pid, 0);
-                if (ret != 0 && errno != ESRCH) {
-                    close(fd);
-                    free(file);
-                    return EEXIST;
-                }
-            }
-        }
-
-        /* notihng in the file or no process */
-        close(fd);
-        unlink(file);
-
-    } else {
-        if (errno != ENOENT) {
-            free(file);
-            return EIO;
-        }
-    }
-
-    fd = open(file, O_CREAT | O_WRONLY | O_EXCL, 0644);
-    if (fd == -1) {
-        free(file);
-        return EIO;
-    }
-    free(file);
-
-    memset(pid_str, 0, sizeof(pid_str));
-    snprintf(pid_str, sizeof(pid_str) -1, "%u\n", (unsigned int) getpid());
-
-    ret = write(fd, pid_str, strlen(pid_str));
-    if (ret != strlen(pid_str)) {
-        close(fd);
-        return EIO;
-    }
-
-    close(fd);
-
-    return 0;
-}
-
diff --git a/server/util/server.c b/server/util/server.c
new file mode 100644
index 000000000..45a6948ef
--- /dev/null
+++ b/server/util/server.c
@@ -0,0 +1,400 @@
+/*
+   SSSD
+
+   Servers setup routines
+
+   Copyright (C) Andrew Tridgell		1992-2005
+   Copyright (C) Martin Pool			2002
+   Copyright (C) Jelmer Vernooij		2002
+   Copyright (C) James J Myers 			2003 <myersjj@samba.org>
+   Copyright (C) Simo Sorce			2008
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include "../events/events.h"
+#include "../ldb/include/ldb.h"
+#include "confdb/confdb.h"
+#include "util/util.h"
+
+/*******************************************************************
+ Close the low 3 fd's and open dev/null in their place.
+********************************************************************/
+static void close_low_fds(bool stderr_too)
+{
+#ifndef VALGRIND
+	int fd;
+	int i;
+
+	close(0);
+	close(1); 
+
+	if (stderr_too)
+		close(2);
+
+	/* try and use up these file descriptors, so silly
+		library routines writing to stdout etc won't cause havoc */
+	for (i=0;i<3;i++) {
+		if (i == 2 && !stderr_too)
+			continue;
+
+		fd = open("/dev/null",O_RDWR,0);
+		if (fd < 0)
+			fd = open("/dev/null",O_WRONLY,0);
+		if (fd < 0) {
+			DEBUG(0,("Can't open /dev/null\n"));
+			return;
+		}
+		if (fd != i) {
+			DEBUG(0,("Didn't get file descriptor %d\n",i));
+			return;
+		}
+	}
+#endif
+}
+
+/**
+ Become a daemon, discarding the controlling terminal.
+**/
+
+void become_daemon(bool Fork)
+{
+	if (Fork) {
+		if (fork()) {
+			_exit(0);
+		}
+	}
+
+  /* detach from the terminal */
+#ifdef HAVE_SETSID
+	setsid();
+#elif defined(TIOCNOTTY)
+	{
+		int i = open("/dev/tty", O_RDWR, 0);
+		if (i != -1) {
+			ioctl(i, (int) TIOCNOTTY, (char *)0);      
+			close(i);
+		}
+	}
+#endif /* HAVE_SETSID */
+
+	/* Close fd's 0,1,2. Needed if started by rsh */
+	close_low_fds(false);  /* Don't close stderr, let the debug system
+				  attach it to the logfile */
+}
+
+int pidfile(const char *path, const char *name)
+{
+    char pid_str[32];
+    pid_t pid;
+    char *file;
+    int fd;
+    int ret;
+
+    asprintf(&file, "%s/%s.pid", path, name);
+
+    fd = open(file, O_RDONLY, 0644);
+    if (fd != -1) {
+
+        pid_str[sizeof(pid_str) -1] = '\0';
+        ret = read(fd, pid_str, sizeof(pid_str) -1);
+        if (ret > 0) {
+            /* let's check the pid */
+
+            pid = (pid_t)atoi(pid_str);
+            if (pid != 0) {
+                errno = 0;
+                ret = kill(pid, 0);
+                if (ret != 0 && errno != ESRCH) {
+                    close(fd);
+                    free(file);
+                    return EEXIST;
+                }
+            }
+        }
+
+        /* notihng in the file or no process */
+        close(fd);
+        unlink(file);
+
+    } else {
+        if (errno != ENOENT) {
+            free(file);
+            return EIO;
+        }
+    }
+
+    fd = open(file, O_CREAT | O_WRONLY | O_EXCL, 0644);
+    if (fd == -1) {
+        free(file);
+        return EIO;
+    }
+    free(file);
+
+    memset(pid_str, 0, sizeof(pid_str));
+    snprintf(pid_str, sizeof(pid_str) -1, "%u\n", (unsigned int) getpid());
+
+    ret = write(fd, pid_str, strlen(pid_str));
+    if (ret != strlen(pid_str)) {
+        close(fd);
+        return EIO;
+    }
+
+    close(fd);
+
+    return 0;
+}
+
+static void sig_hup(int sig)
+{
+	/* cycle log/debug files */
+	return;
+}
+
+static void sig_term(int sig)
+{
+#if HAVE_GETPGRP
+	static int done_sigterm;
+	if (done_sigterm == 0 && getpgrp() == getpid()) {
+		DEBUG(0,("SIGTERM: killing children\n"));
+		done_sigterm = 1;
+		kill(-getpgrp(), SIGTERM);
+	}
+#endif
+	exit(0);
+}
+
+/*
+  setup signal masks
+*/
+static void setup_signals(void)
+{
+	/* we are never interested in SIGPIPE */
+	BlockSignals(true, SIGPIPE);
+
+#if defined(SIGFPE)
+	/* we are never interested in SIGFPE */
+	BlockSignals(true, SIGFPE);
+#endif
+
+	/* We are no longer interested in USR1 */
+	BlockSignals(true, SIGUSR1);
+
+#if defined(SIGUSR2)
+	/* We are no longer interested in USR2 */
+	BlockSignals(true, SIGUSR2);
+#endif
+
+	/* POSIX demands that signals are inherited. If the invoking process has
+	 * these signals masked, we will have problems, as we won't recieve them. */
+	BlockSignals(false, SIGHUP);
+	BlockSignals(false, SIGTERM);
+
+	CatchSignal(SIGHUP, sig_hup);
+	CatchSignal(SIGTERM, sig_term);
+}
+
+/*
+  handle io on stdin
+*/
+static void server_stdin_handler(struct event_context *event_ctx, struct fd_event *fde,
+				 uint16_t flags, void *private)
+{
+	const char *binary_name = (const char *)private;
+	uint8_t c;
+	if (read(0, &c, 1) == 0) {
+		DEBUG(0,("%s: EOF on stdin - terminating\n", binary_name));
+#if HAVE_GETPGRP
+		if (getpgrp() == getpid()) {
+			kill(-getpgrp(), SIGTERM);
+		}
+#endif
+		exit(0);
+	}
+}
+
+/*
+ main server.
+*/
+int main(int argc, const char *argv[])
+{
+    char *service = NULL;
+	bool opt_daemon = false;
+	bool opt_interactive = false;
+	int opt;
+	poptContext pc;
+	struct event_context *event_ctx;
+    struct confdb_ctx *confdb_ctx;
+    TALLOC_CTX *mem_ctx;
+	uint16_t stdin_event_flags;
+	int ret = EOK;
+    bool is_monitor = false;
+
+    debug_prg_name = argv[0];
+
+	enum {
+		OPT_DAEMON = 1000,
+		OPT_INTERACTIVE
+	};
+	struct poptOption long_options[] = {
+		POPT_AUTOHELP
+		{"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON,
+		 "Become a daemon (default)", NULL },
+		{"interactive",	'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE,
+		 "Run interactive (not a daemon)", NULL},
+		{"service",	's', POPT_ARG_STRING, &service, 0,
+		 "Executes a specific service instead of the monitor", NULL},
+		{"debug-level",	'd', POPT_ARG_INT, &debug_level, 0,
+		 "Executes a specific service instead of the monitor", NULL},
+		{ NULL }
+	};
+
+	pc = poptGetContext(argv[0], argc, argv, long_options, 0);
+	while((opt = poptGetNextOpt(pc)) != -1) {
+		switch(opt) {
+		case OPT_DAEMON:
+			opt_daemon = true;
+			break;
+		case OPT_INTERACTIVE:
+			opt_interactive = true;
+			break;
+		default:
+			fprintf(stderr, "\nInvalid option %s: %s\n\n",
+				  poptBadOption(pc, 0), poptStrerror(opt));
+			poptPrintUsage(pc, stderr, 0);
+			return 1;
+		}
+	}
+
+    if (!service) {
+        fprintf(stderr,"\nERROR: No service specified\n\n");
+        return 5;
+    }
+
+    if (strcmp(service, "monitor") == 0) is_monitor = true;
+
+    if (is_monitor) {
+        if (opt_daemon && opt_interactive) {
+            fprintf(stderr,"\nERROR: "
+                    "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
+            poptPrintUsage(pc, stderr, 0);
+            return 1;
+        } else if (!opt_interactive) {
+            /* default is --daemon */
+            opt_daemon = true;
+        }
+    } else {
+        if (opt_daemon || opt_interactive) {
+            fprintf(stderr,"\nERROR: "
+                    "Options -i or -D not allowed with -s (service)\n\n");
+            poptPrintUsage(pc, stderr, 0);
+            return 1;
+        }
+
+    }
+
+	poptFreeContext(pc);
+
+	setup_signals();
+
+	/* we want default permissions on created files to be very strict,
+	   so set our umask to 0177 */
+	umask(0177);
+
+	if (opt_daemon) {
+		DEBUG(3,("Becoming a daemon.\n"));
+		become_daemon(true);
+
+		ret = pidfile(PID_PATH, "sssd");
+        if (ret != EOK) {
+            fprintf(stderr, "\nERROR: PID File reports daemon already running!\n");
+            return 1;
+        }
+	}
+
+	/* the event context is the top level structure.
+     * Everything else should hang off that */
+	event_ctx = event_context_init(talloc_autofree_context());
+	if (event_ctx == NULL) {
+		DEBUG(0,("The event context initialiaziton failed\n"));
+		return 1;
+	}
+
+    mem_ctx = talloc_new(event_ctx);
+    if (mem_ctx == NULL) {
+        DEBUG(0,("Out of memory, aborting!\n"));
+        return 1;
+    }
+
+    ret = confdb_init(mem_ctx, event_ctx, &confdb_ctx);
+    if (ret != EOK) {
+        DEBUG(0,("The confdb initialization failed\n"));
+		return 1;
+	}
+
+	if (opt_interactive) {
+		/* terminate when stdin goes away */
+		stdin_event_flags = EVENT_FD_READ;
+	} else {
+		/* stay alive forever */
+		stdin_event_flags = 0;
+	}
+
+	/* catch EOF on stdin */
+#ifdef SIGTTIN
+	signal(SIGTTIN, SIG_IGN);
+#endif
+	event_add_fd(event_ctx, event_ctx, 0, stdin_event_flags,
+		     server_stdin_handler,
+		     discard_const(argv[0]));
+
+    /* What are we asked to run ? */
+    if (is_monitor) {
+        /* the monitor */
+        ret = monitor_process_init(mem_ctx, event_ctx, confdb_ctx);
+
+    } else {
+
+        if (strcmp(service, "nss") == 0) {
+            ret = nss_process_init(mem_ctx, event_ctx, confdb_ctx);
+
+        } else if (strcmp(service, "dp") == 0) {
+            ret = dp_process_init(mem_ctx, event_ctx, confdb_ctx);
+
+        } else {
+            fprintf(stderr,
+                    "\nERROR: Unknown Service specified [%s]\n",
+                    service);
+            ret = EINVAL;
+        }
+    }
+
+    if (ret != EOK) return 3;
+
+	/* wait for events - this is where smbd sits for most of its
+	   life */
+	event_loop_wait(event_ctx);
+
+	/* as everything hangs off this event context, freeing it
+	   should initiate a clean shutdown of all services */
+	talloc_free(event_ctx);
+
+	return 0;
+}