1 281a8852 2023-06-06 op /*
  2 eac9287d 2023-06-24 op  * Copyright (c) 2021, 2023 Omar Polo <op@omarpolo.com>
  3 281a8852 2023-06-06 op  *
  4 281a8852 2023-06-06 op  * Permission to use, copy, modify, and distribute this software for any
  5 281a8852 2023-06-06 op  * purpose with or without fee is hereby granted, provided that the above
  6 281a8852 2023-06-06 op  * copyright notice and this permission notice appear in all copies.
  7 281a8852 2023-06-06 op  *
  8 281a8852 2023-06-06 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 281a8852 2023-06-06 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 281a8852 2023-06-06 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 281a8852 2023-06-06 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 281a8852 2023-06-06 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 281a8852 2023-06-06 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 281a8852 2023-06-06 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 281a8852 2023-06-06 op  */
 16 281a8852 2023-06-06 op 
 17 281a8852 2023-06-06 op #include "gmid.h"
 18 281a8852 2023-06-06 op 
 19 281a8852 2023-06-06 op #include <sys/types.h>
 20 281a8852 2023-06-06 op #include <sys/uio.h>
 21 281a8852 2023-06-06 op 
 22 281a8852 2023-06-06 op #include <errno.h>
 23 281a8852 2023-06-06 op #include <event.h>
 24 281a8852 2023-06-06 op #include <imsg.h>
 25 281a8852 2023-06-06 op #include <netdb.h>
 26 281a8852 2023-06-06 op #include <poll.h>
 27 281a8852 2023-06-06 op #include <stdarg.h>
 28 281a8852 2023-06-06 op #include <stdio.h>
 29 281a8852 2023-06-06 op #include <string.h>
 30 281a8852 2023-06-06 op #include <syslog.h>
 31 281a8852 2023-06-06 op #include <time.h>
 32 281a8852 2023-06-06 op 
 33 eae52ad4 2023-06-06 op #include "log.h"
 34 c26f2460 2023-06-08 op #include "proc.h"
 35 281a8852 2023-06-06 op 
 36 c26f2460 2023-06-08 op #ifndef nitems
 37 c26f2460 2023-06-08 op #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
 38 c26f2460 2023-06-08 op #endif
 39 281a8852 2023-06-06 op 
 40 e0750210 2023-07-24 op static int logfd = -1;
 41 46bcc4ea 2023-07-26 op static int log_to_syslog = 1;
 42 9abba172 2023-08-07 op static int facility = LOG_DAEMON;
 43 281a8852 2023-06-06 op 
 44 c26f2460 2023-06-08 op static void logger_init(struct privsep *, struct privsep_proc *, void *);
 45 c26f2460 2023-06-08 op static void logger_shutdown(void);
 46 c26f2460 2023-06-08 op static int logger_dispatch_parent(int, struct privsep_proc *, struct imsg *);
 47 c26f2460 2023-06-08 op static int logger_dispatch_server(int, struct privsep_proc *, struct imsg *);
 48 281a8852 2023-06-06 op 
 49 c26f2460 2023-06-08 op static struct privsep_proc procs[] = {
 50 c26f2460 2023-06-08 op 	{ "parent",	PROC_PARENT,	logger_dispatch_parent },
 51 c26f2460 2023-06-08 op 	{ "server",	PROC_SERVER,	logger_dispatch_server },
 52 281a8852 2023-06-06 op };
 53 281a8852 2023-06-06 op 
 54 281a8852 2023-06-06 op void
 55 c26f2460 2023-06-08 op logger(struct privsep *ps, struct privsep_proc *p)
 56 281a8852 2023-06-06 op {
 57 c26f2460 2023-06-08 op 	proc_run(ps, p, procs, nitems(procs), logger_init, NULL);
 58 281a8852 2023-06-06 op }
 59 281a8852 2023-06-06 op 
 60 281a8852 2023-06-06 op static void
 61 c26f2460 2023-06-08 op logger_init(struct privsep *ps, struct privsep_proc *p, void *arg)
 62 281a8852 2023-06-06 op {
 63 c26f2460 2023-06-08 op 	p->p_shutdown = logger_shutdown;
 64 618b1d4d 2023-08-23 op 
 65 618b1d4d 2023-08-23 op 	openlog(getprogname(), LOG_NDELAY, LOG_DAEMON);
 66 618b1d4d 2023-08-23 op 	tzset();
 67 618b1d4d 2023-08-23 op 
 68 c26f2460 2023-06-08 op 	sandbox_logger_process();
 69 281a8852 2023-06-06 op }
 70 281a8852 2023-06-06 op 
 71 281a8852 2023-06-06 op static void
 72 c26f2460 2023-06-08 op logger_shutdown(void)
 73 281a8852 2023-06-06 op {
 74 c26f2460 2023-06-08 op 	closelog();
 75 3826d7de 2023-07-24 op 	if (logfd != -1)
 76 3826d7de 2023-07-24 op 		close(logfd);
 77 c26f2460 2023-06-08 op }
 78 281a8852 2023-06-06 op 
 79 c26f2460 2023-06-08 op static int
 80 c26f2460 2023-06-08 op logger_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
 81 c26f2460 2023-06-08 op {
 82 83a2644b 2024-01-21 op 	switch (imsg_get_type(imsg)) {
 83 9abba172 2023-08-07 op 	case IMSG_LOG_FACILITY:
 84 6dec2ad7 2024-01-21 op 		if (imsg_get_data(imsg, &facility, sizeof(facility)) == -1)
 85 9abba172 2023-08-07 op 			fatal("corrupted IMSG_LOG_SYSLOG");
 86 9abba172 2023-08-07 op 		break;
 87 46bcc4ea 2023-07-26 op 	case IMSG_LOG_SYSLOG:
 88 6dec2ad7 2024-01-21 op 		if (imsg_get_data(imsg, &log_to_syslog,
 89 6dec2ad7 2024-01-21 op 		    sizeof(log_to_syslog)) == -1)
 90 46bcc4ea 2023-07-26 op 			fatal("corrupted IMSG_LOG_SYSLOG");
 91 46bcc4ea 2023-07-26 op 		break;
 92 cba01a86 2023-07-26 op 	case IMSG_LOG_ACCESS:
 93 3826d7de 2023-07-24 op 		if (logfd != -1)
 94 3826d7de 2023-07-24 op 			close(logfd);
 95 b03e976a 2024-01-21 op 		logfd = imsg_get_fd(imsg);
 96 c26f2460 2023-06-08 op 		break;
 97 c26f2460 2023-06-08 op 	default:
 98 c26f2460 2023-06-08 op 		return -1;
 99 281a8852 2023-06-06 op 	}
100 281a8852 2023-06-06 op 
101 c26f2460 2023-06-08 op 	return 0;
102 281a8852 2023-06-06 op }
103 281a8852 2023-06-06 op 
104 c26f2460 2023-06-08 op static int
105 c26f2460 2023-06-08 op logger_dispatch_server(int fd, struct privsep_proc *p, struct imsg *imsg)
106 281a8852 2023-06-06 op {
107 c26f2460 2023-06-08 op 	char *msg;
108 2a822b03 2024-01-21 op 	size_t datalen = 0;
109 6dec2ad7 2024-01-21 op 	struct ibuf ibuf;
110 281a8852 2023-06-06 op 
111 83a2644b 2024-01-21 op 	switch (imsg_get_type(imsg)) {
112 c26f2460 2023-06-08 op 	case IMSG_LOG_REQUEST:
113 6dec2ad7 2024-01-21 op 		if (imsg_get_ibuf(imsg, &ibuf) == -1 ||
114 6dec2ad7 2024-01-21 op 		    (datalen = ibuf_size(&ibuf)) == 0)
115 c26f2460 2023-06-08 op 			fatal("got invalid IMSG_LOG_REQUEST");
116 6dec2ad7 2024-01-21 op 		msg = ibuf_data(&ibuf);
117 c26f2460 2023-06-08 op 		msg[datalen - 1] = '\0';
118 3826d7de 2023-07-24 op 		if (logfd != -1)
119 3826d7de 2023-07-24 op 			dprintf(logfd, "%s\n", msg);
120 46bcc4ea 2023-07-26 op 		if (log_to_syslog)
121 9abba172 2023-08-07 op 			syslog(facility | LOG_NOTICE, "%s", msg);
122 c26f2460 2023-06-08 op 		break;
123 c26f2460 2023-06-08 op 	default:
124 c26f2460 2023-06-08 op 		return -1;
125 c26f2460 2023-06-08 op 	}
126 281a8852 2023-06-06 op 
127 281a8852 2023-06-06 op 	return 0;
128 281a8852 2023-06-06 op }