2 * Copyright (c) 1995, the EUROPAGATE consortium (see below).
4 * The EUROPAGATE consortium members are:
6 * University College Dublin
7 * Danmarks Teknologiske Videnscenter
8 * An Chomhairle Leabharlanna
9 * Consejo Superior de Investigaciones Cientificas
11 * Permission to use, copy, modify, distribute, and sell this software and
12 * its documentation, in whole or in part, for any purpose, is hereby granted,
15 * 1. This copyright and permission notice appear in all copies of the
16 * software and its documentation. Notices of copyright or attribution
17 * which appear at the beginning of any file must remain unchanged.
19 * 2. The names of EUROPAGATE or the project partners may not be used to
20 * endorse or promote products derived from this software without specific
21 * prior written permission.
23 * 3. Users of this software (implementors and gateway operators) agree to
24 * inform the EUROPAGATE consortium of their use of the software. This
25 * information will be used to evaluate the EUROPAGATE project and the
26 * software, and to plan further developments. The consortium may use
27 * the information in later publications.
29 * 4. Users of this software agree to make their best efforts, when
30 * documenting their use of the software, to acknowledge the EUROPAGATE
31 * consortium, and the role played by the software in their work.
33 * THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT WARRANTY OF ANY KIND,
34 * EXPRESS, IMPLIED, OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
35 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
36 * IN NO EVENT SHALL THE EUROPAGATE CONSORTIUM OR ITS MEMBERS BE LIABLE
37 * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF
38 * ANY KIND, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
39 * OR PROFITS, WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND
40 * ON ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
41 * USE OR PERFORMANCE OF THIS SOFTWARE.
44 /* Gateway Resource Monitor
48 * Revision 1.8 1995/05/16 09:40:42 adam
49 * LICENSE. Setting of CCL token names (and/or/not/set) in read_kernel_res.
51 * Revision 1.7 1995/05/03 12:18:46 adam
52 * This code ran on dtbsun. Minor changes.
54 * Revision 1.6 1995/05/03 09:16:17 adam
57 * Revision 1.5 1995/05/03 07:37:42 adam
58 * CCL commands stop/continue implemented. New functions gw_res_{int,bool}
59 * are used when possible.
61 * Revision 1.4 1995/05/02 15:26:00 adam
62 * Monitor observes death of child (email kernel). The number
63 * of simultanous processes is controlled now. Email requests are
64 * queued if necessary. This scheme should only be forced if no kernels
67 * Revision 1.3 1995/05/02 07:20:10 adam
68 * Use pid of exited child to close fifos.
70 * Revision 1.2 1995/05/01 16:26:57 adam
71 * More work on resource monitor.
73 * Revision 1.1 1995/05/01 12:43:36 adam
74 * First work on resource monitor program.
91 #include <sys/types.h>
101 #define LINE_MAX 1024
103 #define MONITOR_FIFO_S "fifo.s.m"
104 #define MONITOR_FIFO_C "fifo.c.m"
106 static char *module = "monitor";
107 static jmp_buf retry_jmp;
109 static GwRes monitor_res = NULL;
110 static int no_process = 0;
111 static int max_process = 1;
112 static int got_sighup = 0;
113 static int got_term = 0;
114 static int got_int = 0;
115 const char *default_res = "default.res";
118 * reread_resources: reread monitor resources. The static variable,
119 * max_process, is updated.
121 static void reread_resources (void)
124 gw_res_close (monitor_res);
125 monitor_res = gw_res_init ();
126 if (gw_res_merge (monitor_res, default_res))
128 gw_log (GW_LOG_WARN, module, "Couldn't read resource file %s",
132 max_process = gw_res_int (monitor_res, "gw.max.process", 10);
136 int id; /* email user-id */
137 pid_t pid; /* pid of email kernel child */
138 GIP gip; /* fifo information */
139 struct str_queue *queue; /* message queue */
140 struct ke_info *next; /* link to next */
143 /* list of email kernel infos */
144 static struct ke_info *ke_info_list = NULL;
147 * ke_info_add: add/lookup of email kernel info.
148 * id: email user-id to search for.
149 * return: pointer to info structure.
151 struct ke_info *ke_info_add (int id)
153 struct ke_info **kip;
155 for (kip = &ke_info_list; *kip; kip= &(*kip)->next)
156 if ((*kip)->id == id)
158 *kip = malloc (sizeof(**kip));
163 (*kip)->queue = NULL;
167 static void ke_info_del (void)
171 assert (ke_info_list);
173 str_queue_rm (&ki->queue);
174 ke_info_list = ki->next;
179 * catch_child: catch SIGCHLD. Set email kernel pid to -1
180 * to indicate that child has exited
182 static void catch_child (int num)
187 while ((pid=waitpid (-1, 0, WNOHANG)) > 0)
189 for (ki = ke_info_list; ki; ki = ki->next)
194 signal (SIGCHLD, catch_child);
198 * catch_int: catch SIGHUP.
200 static void catch_hup (int num)
203 signal (SIGHUP, catch_hup);
207 * catch_int: catch SIGTERM.
209 static void catch_term (int num)
212 signal (SIGTERM, catch_term);
216 * catch_int: catch SIGINT.
218 static void catch_int (int num)
221 signal (SIGINT, catch_int);
225 * pipe_handle: handle SIGPIPE when transferring message to kernel
227 static void pipe_handle (int dummy)
229 longjmp (retry_jmp, 1);
233 * start_kernel: start email kernel.
234 * argc: argc of email kernel
235 * argv: argv of email kernel
237 * return: pid of email kernel child
239 static pid_t start_kernel (int argc, char **argv, int id)
244 char userid_option[20];
246 argv_p = malloc (sizeof(*argv_p)*(argc+2));
249 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "malloc fail");
252 argv_p[0] = "kernel";
253 for (i = 1; i<argc; i++)
255 sprintf (userid_option, "-i%d", id);
256 argv_p[i++] = userid_option;
259 gw_log (GW_LOG_DEBUG, module, "Starting kernel");
263 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "fork");
268 execv ("kernel", argv_p);
269 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "execvp");
276 * deliver: deliver message to child (email kernel).
277 * argc: exec argc to child (if it need to be started)
278 * argv: exec argv to child (if it need to be started)
280 * queue: message queue to be transferred
281 * gip: pointer to FIFO info. if *gip is NULL prior invocation
282 * it will be created (initialized) and the pointer will be
284 * pidp: pointer to pid. Will hold process-id of child (if it need to
286 * dont_exec: if non-zero a child will never be started; otherwise child
287 * will be started if not already running.
288 * return: 0 if message couldn't be transferred, i.e. dont_exec is non-zero
289 * and the child is not already running.
290 * 1 if message was transferred and the child was already running.
291 * 2 if message was transferred and the child was started and
292 * dont_exec was zero.
293 * 3 serious error. Permissions denied or kernel couldn't be
296 static int deliver (int argc, char **argv, int id, struct str_queue *queue,
297 GIP *gip, pid_t *pidp, int dont_exec)
302 char fifo_server_name[128];
303 char fifo_client_name[128];
307 sprintf (fifo_server_name, "fifo.s.%d", id);
308 sprintf (fifo_client_name, "fifo.c.%d", id);
312 *gip = gipc_initialize (fifo_client_name);
314 oldsig = signal (SIGPIPE, pipe_handle);
318 { /* assume child is running */
319 gipc_close (*gip); /* shut down existing FIFOs */
320 r = gipc_open (*gip, fifo_server_name, 0); /* try re-open ... */
323 { /* assume child is NOT running */
327 { /* we aren't allowed to start */
328 signal (SIGPIPE, oldsig);
331 mknod (fifo_server_name, S_IFIFO|0666, 0);
332 pid = start_kernel (argc, argv, id);
333 if (pidp) /* set pid of child */
335 r = gipc_open (*gip, fifo_server_name, 1);
338 { /* message couldn't be transferred */
339 signal (SIGPIPE, oldsig);
340 gw_log (GW_LOG_WARN, module, "Cannot start kernel");
343 if (r < 0) /* gipc_open fail? */
346 gw_log (GW_LOG_DEBUG|GW_LOG_ERRNO, module, "r==-2");
348 gw_log (GW_LOG_DEBUG|GW_LOG_ERRNO, module, "r==-1");
350 gw_log (GW_LOG_WARN|GW_LOG_ERRNO, module, "gipc_open");
351 longjmp (retry_jmp, 1); /* yet another pass */
353 index = 0; /* transfer. may be interrupted */
354 while ((msg = str_queue_get (queue, index++)))
355 gip_wline (*gip, msg);
356 signal (SIGPIPE, oldsig);
357 return pass; /* successful transfer */
361 * monitor_events: Event loop of monitor
362 * argc: argc of monitor (used in exec of Email kernel children)
363 * argv: argv of monitor (used in exec of Email kernel children)
365 static void monitor_events (int argc, char **argv)
371 char command[128], *cp;
373 gip_m = gips_initialize (MONITOR_FIFO_S);
374 r = gips_open (gip_m, MONITOR_FIFO_C);
375 gip_m_fd = gip_infileno (gip_m);
376 open (MONITOR_FIFO_S, O_WRONLY);
387 gw_log (GW_LOG_STAT, module, "Got SIGHUP. Reading resources");
393 gw_log (GW_LOG_STAT, module, "Got SIGTERM. Exiting...");
394 unlink (MONITOR_FIFO_S);
395 unlink (MONITOR_FIFO_C);
400 gw_log (GW_LOG_STAT, module, "Got SIGINT. Exiting...");
401 unlink (MONITOR_FIFO_S);
402 unlink (MONITOR_FIFO_C);
405 /* deliver any unsent messages to Email kernels */
406 for (ki = ke_info_list; ki; ki = ki->next)
410 gw_log (GW_LOG_DEBUG, module, "Transfer mail to %d", ki->id);
411 r = deliver (argc, argv, ki->id, ki->queue, &ki->gip, &ki->pid,
412 no_process >= max_process);
413 if (r == 2) /* new child was spawned? */
415 if (r == 1 || r == 2) /* transfer at all? */
416 str_queue_rm (&ki->queue);
419 FD_SET (gip_m_fd, &set_r);
420 gw_log (GW_LOG_DEBUG, module, "set gip_m_fd %d", gip_m_fd);
423 for (ki = ke_info_list; ki; ki = ki->next)
429 { /* child has exited */
430 gw_log (GW_LOG_DEBUG, module, "Close of %d", ki->id);
431 gipc_close (ki->gip);
432 gipc_destroy (ki->gip);
435 else if ((fd = gip_infileno (ki->gip)) != -1)
436 { /* read select on child FIFO */
437 gw_log (GW_LOG_DEBUG, module, "set fd %d", fd);
444 gw_log (GW_LOG_DEBUG, module, "Cur/Max processes %d/%d",
445 no_process, max_process);
446 gw_log (GW_LOG_DEBUG, module, "IPC select");
447 r = select (fd_max+1, &set_r, NULL, NULL, NULL);
451 { /* select aborted. And it was not due to interrupt */
452 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "select");
455 /* select was interrupted. Probably child has died */
456 gw_log (GW_LOG_DEBUG|GW_LOG_ERRNO, module, "select");
458 /* go through list of Email kernels. See if any message has arrived */
459 gw_log (GW_LOG_DEBUG, module, "Testing ke_info_list");
460 for (ki = ke_info_list; ki; ki = ki->next)
463 if (ki->gip && (fd = gip_infileno (ki->gip)) != -1)
465 gw_log (GW_LOG_DEBUG, module, "Test of %d", fd);
466 if (FD_ISSET (fd, &set_r))
468 if (lgets (line_buf, sizeof(line_buf)-1, fd))
470 gw_log (GW_LOG_DEBUG, module, "IPC: %s", line_buf);
474 gw_log (GW_LOG_DEBUG, module, "Close of %d", ki->id);
475 gipc_close (ki->gip);
476 gipc_destroy (ki->gip);
482 /* see if any message from eti has arrived */
483 gw_log (GW_LOG_DEBUG, module, "Testing gip_m_fd %d", gip_m_fd);
484 if (FD_ISSET (gip_m_fd, &set_r))
486 gw_log (GW_LOG_DEBUG, module, "Reading from %d", gip_m_fd);
487 if (!(lgets (command, sizeof(command)-1, gip_m_fd)))
489 gw_log (GW_LOG_FATAL, module, "Unexpected close");
492 gw_log (GW_LOG_DEBUG, module, "Done");
493 if ((cp = strchr (command, '\n')))
495 gw_log (GW_LOG_DEBUG, module, "IPC: %s", command);
496 if (!memcmp (command, "eti ", 4))
498 int id = atoi (command+4);
499 struct ke_info *new_k;
501 new_k = ke_info_add (id);
502 gw_log (GW_LOG_DEBUG, module, "Incoming mail %d", id);
506 if (!(new_k->queue = str_queue_mk ()))
508 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module,
513 str_queue_enq (new_k->queue, "mail\n");
514 while (lgets (line_buf, sizeof(line_buf)-1, gip_m_fd))
515 str_queue_enq (new_k->queue, line_buf);
516 str_queue_enq (new_k->queue, "\001");
523 * main: main of monitor
525 int main (int argc, char **argv)
530 while (++argno < argc)
532 if (argv[argno][0] == '-')
534 switch (argv[argno][1])
537 fprintf (stderr, "monitor [option..] [resource]\n");
538 fprintf (stderr, "If no resource file is given");
539 fprintf (stderr, " default.res is used\n");
540 fprintf (stderr, "Options are transferred to kernel\n");
543 gw_log_level (GW_LOG_ALL & ~RES_DEBUG);
546 gw_log_level (GW_LOG_ALL);
551 default_res = argv[argno];
554 signal (SIGCHLD, catch_child);
555 signal (SIGHUP, catch_hup);
556 signal (SIGTERM, catch_term);
557 signal (SIGINT, catch_int);
559 gw_log_file (GW_LOG_ALL, "monitor.log");
561 monitor_events (argc, argv);