1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include <sys/fm/protocol.h> 28 #include <sys/strlog.h> 29 #include <sys/log.h> 30 31 #include <fm/fmd_api.h> 32 #include <fm/fmd_msg.h> 33 34 #include <stropts.h> 35 #include <strings.h> 36 #include <syslog.h> 37 #include <alloca.h> 38 #include <unistd.h> 39 #include <stdlib.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 43 static struct stats { 44 fmd_stat_t bad_vers; 45 fmd_stat_t bad_code; 46 fmd_stat_t log_err; 47 fmd_stat_t msg_err; 48 fmd_stat_t no_msg; 49 } syslog_stats = { 50 { "bad_vers", FMD_TYPE_UINT64, "event version is missing or invalid" }, 51 { "bad_code", FMD_TYPE_UINT64, "event code has no dictionary name" }, 52 { "log_err", FMD_TYPE_UINT64, "failed to log message to log(7D)" }, 53 { "msg_err", FMD_TYPE_UINT64, "failed to log message to sysmsg(7D)" }, 54 { "no_msg", FMD_TYPE_UINT64, "message logging suppressed" } 55 }; 56 57 static const struct facility { 58 const char *fac_name; 59 int fac_value; 60 } syslog_facs[] = { 61 { "LOG_DAEMON", LOG_DAEMON }, 62 { "LOG_LOCAL0", LOG_LOCAL0 }, 63 { "LOG_LOCAL1", LOG_LOCAL1 }, 64 { "LOG_LOCAL2", LOG_LOCAL2 }, 65 { "LOG_LOCAL3", LOG_LOCAL3 }, 66 { "LOG_LOCAL4", LOG_LOCAL4 }, 67 { "LOG_LOCAL5", LOG_LOCAL5 }, 68 { "LOG_LOCAL6", LOG_LOCAL6 }, 69 { "LOG_LOCAL7", LOG_LOCAL7 }, 70 { NULL, 0 } 71 }; 72 73 static fmd_msg_hdl_t *syslog_msghdl; /* handle for libfmd_msg calls */ 74 static int syslog_msgall; /* set to message all faults */ 75 static log_ctl_t syslog_ctl; /* log(7D) meta-data for each msg */ 76 static int syslog_logfd = -1; /* log(7D) file descriptor */ 77 static int syslog_msgfd = -1; /* sysmsg(7D) file descriptor */ 78 static int syslog_file; /* log to syslog_logfd */ 79 static int syslog_cons; /* log to syslog_msgfd */ 80 static const char SYSLOG_POINTER[] = "syslog-msgs-pointer"; 81 82 /* 83 * Ideally we would just use syslog(3C) for outputting our messages, but our 84 * messaging standard defines a nice multi-line format and syslogd(1M) is very 85 * inflexible and stupid when it comes to multi-line messages. It pulls data 86 * out of log(7D) and splits it up by \n, printing each line to the console 87 * with its usual prefix of date and sender; it uses the same behavior for the 88 * messages file as well. Further, syslog(3C) provides no CE_CONT equivalent 89 * for userland callers (which at least works around repeated file prefixing). 90 * So with a multi-line message format, your file and console end up like this: 91 * 92 * Dec 02 18:08:40 hostname this is my nicely formatted 93 * Dec 02 18:08:40 hostname message designed for 80 cols 94 * ... 95 * 96 * To resolve these issues, we use our own syslog_emit() wrapper to emit 97 * messages and some knowledge of how the Solaris log drivers work. We first 98 * construct an enlarged format string containing the appropriate msgid(1). 99 * We then format the caller's message using the provided format and buffer. 100 * We send this message to log(7D) using putmsg() with SL_CONSOLE | SL_LOGONLY 101 * set in the log_ctl_t. The log driver allows us to set SL_LOGONLY when we 102 * construct messages ourself, indicating that syslogd should only emit the 103 * message to /var/adm/messages and any remote hosts, and skip the console. 104 * Then we emit the message a second time, without the special prefix, to the 105 * sysmsg(7D) device, which handles console redirection and also permits us 106 * to output any characters we like to the console, including \n and \r. 107 */ 108 static void 109 syslog_emit(fmd_hdl_t *hdl, const char *msg) 110 { 111 struct strbuf ctl, dat; 112 uint32_t msgid; 113 114 char *buf; 115 size_t buflen; 116 117 const char *format = "fmd: [ID %u FACILITY_AND_PRIORITY] %s"; 118 STRLOG_MAKE_MSGID(format, msgid); 119 120 buflen = snprintf(NULL, 0, format, msgid, msg); 121 buf = alloca(buflen + 1); 122 (void) snprintf(buf, buflen + 1, format, msgid, msg); 123 124 ctl.buf = (void *)&syslog_ctl; 125 ctl.len = sizeof (syslog_ctl); 126 127 dat.buf = buf; 128 dat.len = buflen + 1; 129 130 /* 131 * The underlying log driver won't accept messages longer than 132 * LOG_MAXPS bytes. Therefore, messages which exceed this limit will 133 * be truncated and appended with a pointer to the full message. 134 */ 135 if (dat.len > LOG_MAXPS) { 136 char *syslog_pointer, *p; 137 size_t plen; 138 139 if ((syslog_pointer = fmd_msg_gettext_id(syslog_msghdl, NULL, 140 SYSLOG_POINTER)) == NULL) { 141 /* 142 * This shouldn't happen, but if it does we'll just 143 * truncate the message. 144 */ 145 buf[LOG_MAXPS - 1] = '\0'; 146 dat.len = LOG_MAXPS; 147 } else { 148 plen = strlen(syslog_pointer) + 1; 149 buf[LOG_MAXPS - plen] = '\0'; 150 /* 151 * If possible, the pointer is appended after a newline 152 */ 153 if ((p = strrchr(buf, '\n')) == NULL) 154 p = &buf[LOG_MAXPS - plen]; 155 156 (void) strcpy(p, syslog_pointer); 157 free(syslog_pointer); 158 dat.len = strlen(buf) + 1; 159 } 160 } 161 if (syslog_file && putmsg(syslog_logfd, &ctl, &dat, 0) != 0) { 162 fmd_hdl_debug(hdl, "putmsg failed: %s\n", strerror(errno)); 163 syslog_stats.log_err.fmds_value.ui64++; 164 } 165 166 dat.buf = strchr(buf, ']'); 167 dat.len -= (size_t)(dat.buf - buf); 168 169 dat.buf[0] = '\r'; /* overwrite ']' with carriage return */ 170 dat.buf[1] = '\n'; /* overwrite ' ' with newline */ 171 172 if (syslog_cons && write(syslog_msgfd, dat.buf, dat.len) != dat.len) { 173 fmd_hdl_debug(hdl, "write failed: %s\n", strerror(errno)); 174 syslog_stats.msg_err.fmds_value.ui64++; 175 } 176 } 177 178 /*ARGSUSED*/ 179 static void 180 syslog_recv(fmd_hdl_t *hdl, fmd_event_t *ep, nvlist_t *nvl, const char *class) 181 { 182 uint8_t version; 183 boolean_t domsg; 184 char *msg; 185 186 if (nvlist_lookup_uint8(nvl, FM_VERSION, &version) != 0 || 187 version > FM_SUSPECT_VERSION) { 188 fmd_hdl_debug(hdl, "invalid event version: %u\n", version); 189 syslog_stats.bad_vers.fmds_value.ui64++; 190 return; /* invalid event version */ 191 } 192 193 if (!syslog_msgall && nvlist_lookup_boolean_value(nvl, 194 FM_SUSPECT_MESSAGE, &domsg) == 0 && !domsg) { 195 fmd_hdl_debug(hdl, "%s requested no message\n", class); 196 syslog_stats.no_msg.fmds_value.ui64++; 197 return; /* event is not to be messaged */ 198 } 199 200 if ((msg = fmd_msg_gettext_nv(syslog_msghdl, NULL, nvl)) == NULL) { 201 fmd_hdl_debug(hdl, "failed to format message"); 202 syslog_stats.bad_code.fmds_value.ui64++; 203 return; /* libfmd_msg error */ 204 } 205 206 syslog_ctl.pri &= LOG_FACMASK; 207 if (strcmp(class, FM_LIST_RESOLVED_CLASS) == 0 || 208 strcmp(class, FM_LIST_REPAIRED_CLASS) == 0) 209 syslog_ctl.pri |= LOG_NOTICE; 210 else 211 syslog_ctl.pri |= LOG_ERR; 212 213 syslog_emit(hdl, msg); 214 free(msg); 215 } 216 217 static const fmd_prop_t fmd_props[] = { 218 { "console", FMD_TYPE_BOOL, "true" }, 219 { "facility", FMD_TYPE_STRING, "LOG_DAEMON" }, 220 { "gmt", FMD_TYPE_BOOL, "false" }, 221 { "syslogd", FMD_TYPE_BOOL, "true" }, 222 { "url", FMD_TYPE_STRING, "http://sun.com/msg/" }, 223 { "message_all", FMD_TYPE_BOOL, "false" }, 224 { NULL, 0, NULL } 225 }; 226 227 static const fmd_hdl_ops_t fmd_ops = { 228 syslog_recv, /* fmdo_recv */ 229 NULL, /* fmdo_timeout */ 230 NULL, /* fmdo_close */ 231 NULL, /* fmdo_stats */ 232 NULL, /* fmdo_gc */ 233 }; 234 235 static const fmd_hdl_info_t fmd_info = { 236 "Syslog Messaging Agent", "1.0", &fmd_ops, fmd_props 237 }; 238 239 void 240 _fmd_init(fmd_hdl_t *hdl) 241 { 242 const struct facility *fp; 243 char *facname, *tz, *rootdir, *urlbase; 244 245 if (fmd_hdl_register(hdl, FMD_API_VERSION, &fmd_info) != 0) 246 return; /* invalid data in configuration file */ 247 248 (void) fmd_stat_create(hdl, FMD_STAT_NOALLOC, sizeof (syslog_stats) / 249 sizeof (fmd_stat_t), (fmd_stat_t *)&syslog_stats); 250 251 if ((syslog_logfd = open("/dev/conslog", O_WRONLY | O_NOCTTY)) == -1) 252 fmd_hdl_abort(hdl, "syslog-msgs failed to open /dev/conslog"); 253 254 if ((syslog_msgfd = open("/dev/sysmsg", O_WRONLY | O_NOCTTY)) == -1) 255 fmd_hdl_abort(hdl, "syslog-msgs failed to open /dev/sysmsg"); 256 257 /* 258 * If the "gmt" property is set to true, force our EVENT-TIME to be 259 * reported in GMT time; otherwise we use localtime. tzset() affects 260 * the results of subsequent calls to strftime(3C) above. 261 */ 262 if (fmd_prop_get_int32(hdl, "gmt") == FMD_B_TRUE && 263 ((tz = getenv("TZ")) == NULL || strcmp(tz, "GMT") != 0)) { 264 (void) putenv(fmd_hdl_strdup(hdl, "TZ=GMT", FMD_SLEEP)); 265 tzset(); /* reload env */ 266 } 267 268 /* 269 * Look up the value of the "facility" property and use it to determine 270 * what syslog LOG_* facility value we use to fill in our log_ctl_t. 271 * The details of our logging method are described above syslog_emit(). 272 */ 273 facname = fmd_prop_get_string(hdl, "facility"); 274 275 for (fp = syslog_facs; fp->fac_name != NULL; fp++) { 276 if (strcmp(fp->fac_name, facname) == 0) 277 break; 278 } 279 280 if (fp->fac_name == NULL) 281 fmd_hdl_abort(hdl, "invalid 'facility' setting: %s\n", facname); 282 283 fmd_prop_free_string(hdl, facname); 284 syslog_ctl.pri = fp->fac_value; 285 syslog_ctl.flags = SL_CONSOLE | SL_LOGONLY; 286 287 /* 288 * Cache any properties we use every time we receive an event and 289 * subscribe to list.suspect events regardless of the .conf file. 290 */ 291 syslog_file = fmd_prop_get_int32(hdl, "syslogd"); 292 syslog_cons = fmd_prop_get_int32(hdl, "console"); 293 syslog_msgall = fmd_prop_get_int32(hdl, "message_all"); 294 295 rootdir = fmd_prop_get_string(hdl, "fmd.rootdir"); 296 syslog_msghdl = fmd_msg_init(rootdir, FMD_MSG_VERSION); 297 fmd_prop_free_string(hdl, rootdir); 298 299 if (syslog_msghdl == NULL) 300 fmd_hdl_abort(hdl, "failed to initialize libfmd_msg"); 301 302 urlbase = fmd_prop_get_string(hdl, "url"); 303 (void) fmd_msg_url_set(syslog_msghdl, urlbase); 304 fmd_prop_free_string(hdl, urlbase); 305 306 fmd_hdl_subscribe(hdl, FM_LIST_SUSPECT_CLASS); 307 fmd_hdl_subscribe(hdl, FM_LIST_REPAIRED_CLASS); 308 fmd_hdl_subscribe(hdl, FM_LIST_RESOLVED_CLASS); 309 } 310 311 /*ARGSUSED*/ 312 void 313 _fmd_fini(fmd_hdl_t *hdl) 314 { 315 fmd_msg_fini(syslog_msghdl); 316 (void) close(syslog_logfd); 317 (void) close(syslog_msgfd); 318 } 319