mdw@git.distorted.org.uk Git - secnet/blob - log.c

   1 #include "secnet.h"
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include <time.h>
   6 #include <errno.h>
   7 #include <syslog.h>
   8 #include <assert.h>
   9 #include <unistd.h>
  10 #include "process.h"
  11 #include "util.h"
  12
  13 bool_t secnet_is_daemon=False;
  14 uint32_t message_level=M_WARNING|M_ERR|M_SECURITY|M_FATAL;
  15 struct log_if *system_log=NULL;
  16
  17 static void vMessageFallback(uint32_t class, const char *message, va_list args)
  18     FORMAT(printf,2,0);
  19 static void vMessageFallback(uint32_t class, const char *message, va_list args)
  20 {
  21     FILE *dest=stdout;
  22     /* Messages go to stdout/stderr */
  23     if (class & message_level) {
  24         if (class&M_FATAL || class&M_ERR || class&M_WARNING) {
  25             dest=stderr;
  26         }
  27         vfprintf(dest,message,args);
  28     }
  29 }
  30
  31 static void vMessage(uint32_t class, const char *message, va_list args)
  32 {
  33
  34     if (system_log) {
  35         /* Messages go to the system log interface */
  36         vslilog_part(system_log, class, message, args);
  37     } else {
  38         vMessageFallback(class,message,args);
  39     }
  40 }
  41
  42 void Message(uint32_t class, const char *message, ...)
  43 {
  44     va_list ap;
  45
  46     va_start(ap,message);
  47     vMessage(class,message,ap);
  48     va_end(ap);
  49 }
  50
  51 static void MessageFallback(uint32_t class, const char *message, ...)
  52     FORMAT(printf,2,3);
  53 static void MessageFallback(uint32_t class, const char *message, ...)
  54 {
  55     va_list ap;
  56
  57     va_start(ap,message);
  58     vMessageFallback(class,message,ap);
  59     va_end(ap);
  60 }
  61
  62 static NORETURN(vfatal(int status, bool_t perror, const char *message,
  63                        va_list args));
  64
  65 static void vfatal(int status, bool_t perror, const char *message,
  66                    va_list args)
  67 {
  68     int err;
  69
  70     err=errno;
  71
  72     enter_phase(PHASE_SHUTDOWN);
  73     Message(M_FATAL, "secnet fatal error: ");
  74     vMessage(M_FATAL, message, args);
  75     if (perror)
  76         Message(M_FATAL, ": %s\n",strerror(err));
  77     else
  78         Message(M_FATAL, "\n");
  79     exit(status);
  80 }
  81
  82 void fatal(const char *message, ...)
  83 {
  84     va_list args;
  85     va_start(args,message);
  86     vfatal(current_phase,False,message,args);
  87     va_end(args);
  88 }
  89
  90 void fatal_status(int status, const char *message, ...)
  91 {
  92     va_list args;
  93     va_start(args,message);
  94     vfatal(status,False,message,args);
  95     va_end(args);
  96 }
  97
  98 void fatal_perror(const char *message, ...)
  99 {
 100     va_list args;
 101     va_start(args,message);
 102     vfatal(current_phase,True,message,args);
 103     va_end(args);
 104 }
 105
 106 void fatal_perror_status(int status, const char *message, ...)
 107 {
 108     va_list args;
 109     va_start(args,message);
 110     vfatal(status,True,message,args);
 111     va_end(args);
 112 }
 113
 114 void vcfgfatal_maybefile(FILE *maybe_f /* or 0 */, struct cloc loc,
 115                          cstring_t facility, const char *message, va_list args)
 116 {
 117     enter_phase(PHASE_SHUTDOWN);
 118
 119     if (maybe_f && ferror(maybe_f)) {
 120         assert(loc.file);
 121         Message(M_FATAL, "error reading config file (%s, %s): %s",
 122                 facility, loc.file, strerror(errno));
 123     } else if (maybe_f && feof(maybe_f)) {
 124         assert(loc.file);
 125         Message(M_FATAL, "unexpected end of config file (%s, %s)",
 126                 facility, loc.file);
 127     } else if (loc.file && loc.line) {
 128         Message(M_FATAL, "config error (%s, %s:%d): ",facility,loc.file,
 129                 loc.line);
 130     } else if (!loc.file && loc.line) {
 131         Message(M_FATAL, "config error (%s, line %d): ",facility,loc.line);
 132     } else {
 133         Message(M_FATAL, "config error (%s): ",facility);
 134     }
 135
 136     vMessage(M_FATAL,message,args);
 137     exit(current_phase);
 138 }
 139
 140 void cfgfatal_maybefile(FILE *maybe_f, struct cloc loc, cstring_t facility,
 141                         const char *message, ...)
 142 {
 143     va_list args;
 144
 145     va_start(args,message);
 146     vcfgfatal_maybefile(maybe_f,loc,facility,message,args);
 147     va_end(args);
 148 }
 149
 150 void cfgfatal(struct cloc loc, cstring_t facility, const char *message, ...)
 151 {
 152     va_list args;
 153
 154     va_start(args,message);
 155     vcfgfatal_maybefile(0,loc,facility,message,args);
 156     va_end(args);
 157 }
 158
 159 void cfgfile_postreadcheck(struct cloc loc, FILE *f)
 160 {
 161     assert(loc.file);
 162     if (ferror(f)) {
 163         Message(M_FATAL, "error reading config file (%s): %s\n",
 164                 loc.file, strerror(errno));
 165         exit(current_phase);
 166     } else if (feof(f)) {
 167         Message(M_FATAL, "unexpected end of config file (%s)\n", loc.file);
 168         exit(current_phase);
 169     }
 170 }
 171
 172 /* Take a list of log closures and merge them */
 173 struct loglist {
 174     struct log_if *l;
 175     struct loglist *next;
 176 };
 177
 178 static void log_vmulti(void *sst, int class, const char *message, va_list args)
 179 {
 180     struct loglist *st=sst, *i;
 181
 182     if (secnet_is_daemon) {
 183         for (i=st; i; i=i->next) {
 184             vslilog(i->l,class,message,args);
 185         }
 186     } else {
 187         vMessage(class,message,args);
 188         Message(class,"\n");
 189     }
 190 }
 191
 192 struct log_if *init_log(list_t *ll)
 193 {
 194     int i=0;
 195     item_t *item;
 196     closure_t *cl;
 197     struct loglist *l=NULL, *n;
 198     struct log_if *r;
 199
 200     if (list_length(ll)==1) {
 201         item=list_elem(ll,0);
 202         cl=item->data.closure;
 203         if (cl->type!=CL_LOG) {
 204             cfgfatal(item->loc,"init_log","closure is not a logger");
 205         }
 206         return cl->interface;
 207     }
 208     while ((item=list_elem(ll,i++))) {
 209         if (item->type!=t_closure) {
 210             cfgfatal(item->loc,"init_log","item is not a closure");
 211         }
 212         cl=item->data.closure;
 213         if (cl->type!=CL_LOG) {
 214             cfgfatal(item->loc,"init_log","closure is not a logger");
 215         }
 216         n=safe_malloc(sizeof(*n),"init_log");
 217         n->l=cl->interface;
 218         n->next=l;
 219         l=n;
 220     }
 221     if (!l) {
 222         fatal("init_log: no log");
 223     }
 224     r=safe_malloc(sizeof(*r), "init_log");
 225     r->st=l;
 226     r->vlogfn=log_vmulti;
 227     r->buff[0]=0;
 228     return r;
 229 }
 230
 231 struct logfile {
 232     closure_t cl;
 233     struct log_if ops;
 234     struct cloc loc;
 235     string_t logfile;
 236     uint32_t level;
 237     FILE *f;
 238 };
 239
 240 static cstring_t months[]={
 241     "Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
 242
 243 static void logfile_vlog(void *sst, int class, const char *message,
 244                          va_list args)
 245 {
 246     struct logfile *st=sst;
 247     time_t t;
 248     struct tm *tm;
 249
 250     if (secnet_is_daemon && st->f) {
 251         if (class&st->level) {
 252             t=time(NULL);
 253             tm=localtime(&t);
 254             fprintf(st->f,"%s %2d %02d:%02d:%02d ",
 255                     months[tm->tm_mon],tm->tm_mday,tm->tm_hour,tm->tm_min,
 256                     tm->tm_sec);
 257             vfprintf(st->f,message,args);
 258             fprintf(st->f,"\n");
 259             fflush(st->f);
 260         }
 261     } else {
 262         vMessageFallback(class,message,args);
 263         MessageFallback(class,"\n");
 264     }
 265 }
 266
 267 static void logfile_log(void *state, int class, const char *message, ...)
 268     FORMAT(printf,3,4);
 269 static void logfile_log(void *state, int class, const char *message, ...)
 270 {
 271     va_list ap;
 272
 273     va_start(ap,message);
 274     logfile_vlog(state,class,message,ap);
 275     va_end(ap);
 276 }
 277
 278 static void logfile_hup_notify(void *sst, int signum)
 279 {
 280     struct logfile *st=sst;
 281     FILE *f;
 282     f=fopen(st->logfile,"a");
 283     if (!f) {
 284         logfile_log(st,M_FATAL,"received SIGHUP, but could not reopen "
 285                     "logfile: %s",strerror(errno));
 286     } else {
 287         fclose(st->f);
 288         st->f=f;
 289         logfile_log(st,M_INFO,"received SIGHUP");
 290     }
 291 }
 292
 293 static void logfile_phase_hook(void *sst, uint32_t new_phase)
 294 {
 295     struct logfile *st=sst;
 296     FILE *f;
 297
 298     if (background) {
 299         f=fopen(st->logfile,"a");
 300         if (!f) fatal_perror("logfile (%s:%d): cannot open \"%s\"",
 301                              st->loc.file,st->loc.line,st->logfile);
 302         st->f=f;
 303         request_signal_notification(SIGHUP, logfile_hup_notify,st);
 304     }
 305 }
 306
 307 static struct flagstr message_class_table[]={
 308     { "debug-config", M_DEBUG_CONFIG },
 309     { "debug-phase", M_DEBUG_PHASE },
 310     { "debug", M_DEBUG },
 311     { "all-debug", M_DEBUG|M_DEBUG_PHASE|M_DEBUG_CONFIG },
 312     { "info", M_INFO },
 313     { "notice", M_NOTICE },
 314     { "warning", M_WARNING },
 315     { "error", M_ERR },
 316     { "security", M_SECURITY },
 317     { "fatal", M_FATAL },
 318     { "default", M_WARNING|M_ERR|M_SECURITY|M_FATAL },
 319     { "verbose", M_INFO|M_NOTICE|M_WARNING|M_ERR|M_SECURITY|M_FATAL },
 320     { "quiet", M_FATAL },
 321     { NULL, 0 }
 322 };
 323
 324 static list_t *logfile_apply(closure_t *self, struct cloc loc, dict_t *context,
 325                              list_t *args)
 326 {
 327     struct logfile *st;
 328     item_t *item;
 329     dict_t *dict;
 330
 331     /* We should defer opening the logfile until the getresources
 332        phase.  We should defer writing into the logfile until after we
 333        become a daemon. */
 334
 335     st=safe_malloc(sizeof(*st),"logfile_apply");
 336     st->cl.description="logfile";
 337     st->cl.type=CL_LOG;
 338     st->cl.apply=NULL;
 339     st->cl.interface=&st->ops;
 340     st->ops.st=st;
 341     st->ops.vlogfn=logfile_vlog;
 342     st->ops.buff[0]=0;
 343     st->loc=loc;
 344     st->f=NULL;
 345
 346     item=list_elem(args,0);
 347     if (!item || item->type!=t_dict) {
 348         cfgfatal(loc,"logfile","argument must be a dictionary\n");
 349     }
 350     dict=item->data.dict;
 351
 352     st->logfile=dict_read_string(dict,"filename",True,"logfile",loc);
 353     st->level=string_list_to_word(dict_lookup(dict,"class"),
 354                                        message_class_table,"logfile");
 355
 356     add_hook(PHASE_GETRESOURCES,logfile_phase_hook,st);
 357
 358     return new_closure(&st->cl);
 359 }
 360
 361 struct syslog {
 362     closure_t cl;
 363     struct log_if ops;
 364     string_t ident;
 365     int facility;
 366     bool_t open;
 367 };
 368
 369 static int msgclass_to_syslogpriority(uint32_t m)
 370 {
 371     switch (m) {
 372     case M_DEBUG_CONFIG: return LOG_DEBUG;
 373     case M_DEBUG_PHASE: return LOG_DEBUG;
 374     case M_DEBUG: return LOG_DEBUG;
 375     case M_INFO: return LOG_INFO;
 376     case M_NOTICE: return LOG_NOTICE;
 377     case M_WARNING: return LOG_WARNING;
 378     case M_ERR: return LOG_ERR;
 379     case M_SECURITY: return LOG_CRIT;
 380     case M_FATAL: return LOG_EMERG;
 381     default: return LOG_NOTICE;
 382     }
 383 }
 384
 385 static void syslog_vlog(void *sst, int class, const char *message,
 386                          va_list args)
 387     FORMAT(printf,3,0);
 388 static void syslog_vlog(void *sst, int class, const char *message,
 389                          va_list args)
 390 {
 391     struct syslog *st=sst;
 392
 393     if (st->open)
 394         vsyslog(msgclass_to_syslogpriority(class),message,args);
 395     else {
 396         vMessageFallback(class,message,args);
 397         MessageFallback(class,"\n");
 398     }
 399 }
 400
 401 static struct flagstr syslog_facility_table[]={
 402 #ifdef LOG_AUTH
 403     { "auth", LOG_AUTH },
 404 #endif
 405 #ifdef LOG_AUTHPRIV
 406     { "authpriv", LOG_AUTHPRIV },
 407 #endif
 408     { "cron", LOG_CRON },
 409     { "daemon", LOG_DAEMON },
 410     { "kern", LOG_KERN },
 411     { "local0", LOG_LOCAL0 },
 412     { "local1", LOG_LOCAL1 },
 413     { "local2", LOG_LOCAL2 },
 414     { "local3", LOG_LOCAL3 },
 415     { "local4", LOG_LOCAL4 },
 416     { "local5", LOG_LOCAL5 },
 417     { "local6", LOG_LOCAL6 },
 418     { "local7", LOG_LOCAL7 },
 419     { "lpr", LOG_LPR },
 420     { "mail", LOG_MAIL },
 421     { "news", LOG_NEWS },
 422     { "syslog", LOG_SYSLOG },
 423     { "user", LOG_USER },
 424     { "uucp", LOG_UUCP },
 425     { NULL, 0 }
 426 };
 427
 428 static void syslog_phase_hook(void *sst, uint32_t newphase)
 429 {
 430     struct syslog *st=sst;
 431
 432     if (background) {
 433         openlog(st->ident,0,st->facility);
 434         st->open=True;
 435     }
 436 }
 437
 438 static list_t *syslog_apply(closure_t *self, struct cloc loc, dict_t *context,
 439                             list_t *args)
 440 {
 441     struct syslog *st;
 442     dict_t *d;
 443     item_t *item;
 444     string_t facstr;
 445
 446     st=safe_malloc(sizeof(*st),"syslog_apply");
 447     st->cl.description="syslog";
 448     st->cl.type=CL_LOG;
 449     st->cl.apply=NULL;
 450     st->cl.interface=&st->ops;
 451     st->ops.st=st;
 452     st->ops.vlogfn=syslog_vlog;
 453     st->ops.buff[0]=0;
 454
 455     item=list_elem(args,0);
 456     if (!item || item->type!=t_dict)
 457         cfgfatal(loc,"syslog","parameter must be a dictionary\n");
 458     d=item->data.dict;
 459
 460     st->ident=dict_read_string(d, "ident", False, "syslog", loc);
 461     facstr=dict_read_string(d, "facility", True, "syslog", loc);
 462     st->facility=string_to_word(facstr,loc,
 463                                 syslog_facility_table,"syslog");
 464     st->open=False;
 465     add_hook(PHASE_GETRESOURCES,syslog_phase_hook,st);
 466
 467     return new_closure(&st->cl);
 468 }
 469
 470 /* Read from a fd and output to a log.  This is a quick hack to
 471    support logging stderr, and needs code adding to tidy up before it
 472    can be used for anything else. */
 473 #define FDLOG_BUFSIZE 1024
 474 struct fdlog {
 475     struct log_if *log;
 476     int fd;
 477     cstring_t prefix;
 478     string_t buffer;
 479     int i;
 480     bool_t finished;
 481 };
 482
 483 static int log_from_fd_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
 484                                   int *timeout_io)
 485 {
 486     struct fdlog *st=sst;
 487     if (!st->finished) {
 488         BEFOREPOLL_WANT_FDS(1);
 489         fds[0].fd=st->fd;
 490         fds[0].events=POLLIN;
 491     } else {
 492         BEFOREPOLL_WANT_FDS(0);
 493     }
 494     return 0;
 495 }
 496
 497 static void log_from_fd_afterpoll(void *sst, struct pollfd *fds, int nfds)
 498 {
 499     struct fdlog *st=sst;
 500     int r,remain,i;
 501
 502     if (nfds==0) return;
 503     if (fds[0].revents&POLLERR) {
 504         st->finished=True;
 505     }
 506     if (fds[0].revents&POLLIN) {
 507         remain=FDLOG_BUFSIZE-st->i-1;
 508         if (remain<=0) {
 509             st->buffer[FDLOG_BUFSIZE-1]=0;
 510             slilog(st->log,M_WARNING,"%s: overlong line: %s",
 511                          st->prefix,st->buffer);
 512             st->i=0;
 513             remain=FDLOG_BUFSIZE-1;
 514         }
 515         r=read(st->fd,st->buffer+st->i,remain);
 516         if (r>0) {
 517             st->i+=r;
 518             for (i=0; i<st->i; i++) {
 519                 if (st->buffer[i]=='\n') {
 520                     st->buffer[i]=0;
 521                     slilog(st->log,M_INFO,"%s: %s",
 522                                  st->prefix,st->buffer);
 523                     i++;
 524                     memmove(st->buffer,st->buffer+i,st->i-i);
 525                     st->i-=i;
 526                     i=-1;
 527                 }
 528             }
 529         } else {
 530             Message(M_WARNING,"log_from_fd: %s\n",strerror(errno));
 531             st->finished=True;
 532         }
 533     }
 534 }
 535
 536 void log_from_fd(int fd, cstring_t prefix, struct log_if *log)
 537 {
 538     struct fdlog *st;
 539
 540     st=safe_malloc(sizeof(*st),"log_from_fd");
 541     st->log=log;
 542     st->fd=fd;
 543     st->prefix=prefix;
 544     st->buffer=safe_malloc(FDLOG_BUFSIZE,"log_from_fd");
 545     st->i=0;
 546     st->finished=False;
 547
 548     register_for_poll(st,log_from_fd_beforepoll,log_from_fd_afterpoll,1,
 549                       prefix);
 550 }
 551
 552 void log_module(dict_t *dict)
 553 {
 554     add_closure(dict,"logfile",logfile_apply);
 555     add_closure(dict,"syslog",syslog_apply);
 556 }