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 static void log_multi(void *st, int priority, const char *message, ...)
 193     FORMAT(printf,3,4);
 194 static void log_multi(void *st, int priority, const char *message, ...)
 195 {
 196     va_list ap;
 197
 198     va_start(ap,message);
 199     log_vmulti(st,priority,message,ap);
 200     va_end(ap);
 201 }
 202
 203 struct log_if *init_log(list_t *ll)
 204 {
 205     int i=0;
 206     item_t *item;
 207     closure_t *cl;
 208     struct loglist *l=NULL, *n;
 209     struct log_if *r;
 210
 211     if (list_length(ll)==1) {
 212         item=list_elem(ll,0);
 213         cl=item->data.closure;
 214         if (cl->type!=CL_LOG) {
 215             cfgfatal(item->loc,"init_log","closure is not a logger");
 216         }
 217         return cl->interface;
 218     }
 219     while ((item=list_elem(ll,i++))) {
 220         if (item->type!=t_closure) {
 221             cfgfatal(item->loc,"init_log","item is not a closure");
 222         }
 223         cl=item->data.closure;
 224         if (cl->type!=CL_LOG) {
 225             cfgfatal(item->loc,"init_log","closure is not a logger");
 226         }
 227         n=safe_malloc(sizeof(*n),"init_log");
 228         n->l=cl->interface;
 229         n->next=l;
 230         l=n;
 231     }
 232     if (!l) {
 233         fatal("init_log: no log");
 234     }
 235     r=safe_malloc(sizeof(*r), "init_log");
 236     r->st=l;
 237     r->vlogfn=log_vmulti;
 238     r->buff[0]=0;
 239     return r;
 240 }
 241
 242 struct logfile {
 243     closure_t cl;
 244     struct log_if ops;
 245     struct cloc loc;
 246     string_t logfile;
 247     uint32_t level;
 248     FILE *f;
 249 };
 250
 251 static cstring_t months[]={
 252     "Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
 253
 254 static void logfile_vlog(void *sst, int class, const char *message,
 255                          va_list args)
 256 {
 257     struct logfile *st=sst;
 258     time_t t;
 259     struct tm *tm;
 260
 261     if (secnet_is_daemon && st->f) {
 262         if (class&st->level) {
 263             t=time(NULL);
 264             tm=localtime(&t);
 265             fprintf(st->f,"%s %2d %02d:%02d:%02d ",
 266                     months[tm->tm_mon],tm->tm_mday,tm->tm_hour,tm->tm_min,
 267                     tm->tm_sec);
 268             vfprintf(st->f,message,args);
 269             fprintf(st->f,"\n");
 270             fflush(st->f);
 271         }
 272     } else {
 273         vMessageFallback(class,message,args);
 274         MessageFallback(class,"\n");
 275     }
 276 }
 277
 278 static void logfile_log(void *state, int class, const char *message, ...)
 279     FORMAT(printf,3,4);
 280 static void logfile_log(void *state, int class, const char *message, ...)
 281 {
 282     va_list ap;
 283
 284     va_start(ap,message);
 285     logfile_vlog(state,class,message,ap);
 286     va_end(ap);
 287 }
 288
 289 static void logfile_hup_notify(void *sst, int signum)
 290 {
 291     struct logfile *st=sst;
 292     FILE *f;
 293     f=fopen(st->logfile,"a");
 294     if (!f) {
 295         logfile_log(st,M_FATAL,"received SIGHUP, but could not reopen "
 296                     "logfile: %s",strerror(errno));
 297     } else {
 298         fclose(st->f);
 299         st->f=f;
 300         logfile_log(st,M_INFO,"received SIGHUP");
 301     }
 302 }
 303
 304 static void logfile_phase_hook(void *sst, uint32_t new_phase)
 305 {
 306     struct logfile *st=sst;
 307     FILE *f;
 308
 309     if (background) {
 310         f=fopen(st->logfile,"a");
 311         if (!f) fatal_perror("logfile (%s:%d): cannot open \"%s\"",
 312                              st->loc.file,st->loc.line,st->logfile);
 313         st->f=f;
 314         request_signal_notification(SIGHUP, logfile_hup_notify,st);
 315     }
 316 }
 317
 318 static struct flagstr message_class_table[]={
 319     { "debug-config", M_DEBUG_CONFIG },
 320     { "debug-phase", M_DEBUG_PHASE },
 321     { "debug", M_DEBUG },
 322     { "all-debug", M_DEBUG|M_DEBUG_PHASE|M_DEBUG_CONFIG },
 323     { "info", M_INFO },
 324     { "notice", M_NOTICE },
 325     { "warning", M_WARNING },
 326     { "error", M_ERR },
 327     { "security", M_SECURITY },
 328     { "fatal", M_FATAL },
 329     { "default", M_WARNING|M_ERR|M_SECURITY|M_FATAL },
 330     { "verbose", M_INFO|M_NOTICE|M_WARNING|M_ERR|M_SECURITY|M_FATAL },
 331     { "quiet", M_FATAL },
 332     { NULL, 0 }
 333 };
 334
 335 static list_t *logfile_apply(closure_t *self, struct cloc loc, dict_t *context,
 336                              list_t *args)
 337 {
 338     struct logfile *st;
 339     item_t *item;
 340     dict_t *dict;
 341
 342     /* We should defer opening the logfile until the getresources
 343        phase.  We should defer writing into the logfile until after we
 344        become a daemon. */
 345
 346     st=safe_malloc(sizeof(*st),"logfile_apply");
 347     st->cl.description="logfile";
 348     st->cl.type=CL_LOG;
 349     st->cl.apply=NULL;
 350     st->cl.interface=&st->ops;
 351     st->ops.st=st;
 352     st->ops.vlogfn=logfile_vlog;
 353     st->ops.buff[0]=0;
 354     st->loc=loc;
 355     st->f=NULL;
 356
 357     item=list_elem(args,0);
 358     if (!item || item->type!=t_dict) {
 359         cfgfatal(loc,"logfile","argument must be a dictionary\n");
 360     }
 361     dict=item->data.dict;
 362
 363     st->logfile=dict_read_string(dict,"filename",True,"logfile",loc);
 364     st->level=string_list_to_word(dict_lookup(dict,"class"),
 365                                        message_class_table,"logfile");
 366
 367     add_hook(PHASE_GETRESOURCES,logfile_phase_hook,st);
 368
 369     return new_closure(&st->cl);
 370 }
 371
 372 struct syslog {
 373     closure_t cl;
 374     struct log_if ops;
 375     string_t ident;
 376     int facility;
 377     bool_t open;
 378 };
 379
 380 static int msgclass_to_syslogpriority(uint32_t m)
 381 {
 382     switch (m) {
 383     case M_DEBUG_CONFIG: return LOG_DEBUG;
 384     case M_DEBUG_PHASE: return LOG_DEBUG;
 385     case M_DEBUG: return LOG_DEBUG;
 386     case M_INFO: return LOG_INFO;
 387     case M_NOTICE: return LOG_NOTICE;
 388     case M_WARNING: return LOG_WARNING;
 389     case M_ERR: return LOG_ERR;
 390     case M_SECURITY: return LOG_CRIT;
 391     case M_FATAL: return LOG_EMERG;
 392     default: return LOG_NOTICE;
 393     }
 394 }
 395
 396 static void syslog_vlog(void *sst, int class, const char *message,
 397                          va_list args)
 398     FORMAT(printf,3,0);
 399 static void syslog_vlog(void *sst, int class, const char *message,
 400                          va_list args)
 401 {
 402     struct syslog *st=sst;
 403
 404     if (st->open)
 405         vsyslog(msgclass_to_syslogpriority(class),message,args);
 406     else {
 407         vMessageFallback(class,message,args);
 408         MessageFallback(class,"\n");
 409     }
 410 }
 411
 412 static void syslog_log(void *sst, int priority, const char *message, ...)
 413     FORMAT(printf,3,4);
 414 static void syslog_log(void *sst, int priority, const char *message, ...)
 415 {
 416     va_list ap;
 417
 418     va_start(ap,message);
 419     syslog_vlog(sst,priority,message,ap);
 420     va_end(ap);
 421 }
 422
 423 static struct flagstr syslog_facility_table[]={
 424 #ifdef LOG_AUTH
 425     { "auth", LOG_AUTH },
 426 #endif
 427 #ifdef LOG_AUTHPRIV
 428     { "authpriv", LOG_AUTHPRIV },
 429 #endif
 430     { "cron", LOG_CRON },
 431     { "daemon", LOG_DAEMON },
 432     { "kern", LOG_KERN },
 433     { "local0", LOG_LOCAL0 },
 434     { "local1", LOG_LOCAL1 },
 435     { "local2", LOG_LOCAL2 },
 436     { "local3", LOG_LOCAL3 },
 437     { "local4", LOG_LOCAL4 },
 438     { "local5", LOG_LOCAL5 },
 439     { "local6", LOG_LOCAL6 },
 440     { "local7", LOG_LOCAL7 },
 441     { "lpr", LOG_LPR },
 442     { "mail", LOG_MAIL },
 443     { "news", LOG_NEWS },
 444     { "syslog", LOG_SYSLOG },
 445     { "user", LOG_USER },
 446     { "uucp", LOG_UUCP },
 447     { NULL, 0 }
 448 };
 449
 450 static void syslog_phase_hook(void *sst, uint32_t newphase)
 451 {
 452     struct syslog *st=sst;
 453
 454     if (background) {
 455         openlog(st->ident,0,st->facility);
 456         st->open=True;
 457     }
 458 }
 459
 460 static list_t *syslog_apply(closure_t *self, struct cloc loc, dict_t *context,
 461                             list_t *args)
 462 {
 463     struct syslog *st;
 464     dict_t *d;
 465     item_t *item;
 466     string_t facstr;
 467
 468     st=safe_malloc(sizeof(*st),"syslog_apply");
 469     st->cl.description="syslog";
 470     st->cl.type=CL_LOG;
 471     st->cl.apply=NULL;
 472     st->cl.interface=&st->ops;
 473     st->ops.st=st;
 474     st->ops.vlogfn=syslog_vlog;
 475     st->ops.buff[0]=0;
 476
 477     item=list_elem(args,0);
 478     if (!item || item->type!=t_dict)
 479         cfgfatal(loc,"syslog","parameter must be a dictionary\n");
 480     d=item->data.dict;
 481
 482     st->ident=dict_read_string(d, "ident", False, "syslog", loc);
 483     facstr=dict_read_string(d, "facility", True, "syslog", loc);
 484     st->facility=string_to_word(facstr,loc,
 485                                 syslog_facility_table,"syslog");
 486     st->open=False;
 487     add_hook(PHASE_GETRESOURCES,syslog_phase_hook,st);
 488
 489     return new_closure(&st->cl);
 490 }
 491
 492 /* Read from a fd and output to a log.  This is a quick hack to
 493    support logging stderr, and needs code adding to tidy up before it
 494    can be used for anything else. */
 495 #define FDLOG_BUFSIZE 1024
 496 struct fdlog {
 497     struct log_if *log;
 498     int fd;
 499     cstring_t prefix;
 500     string_t buffer;
 501     int i;
 502     bool_t finished;
 503 };
 504
 505 static int log_from_fd_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
 506                                   int *timeout_io)
 507 {
 508     struct fdlog *st=sst;
 509     if (!st->finished) {
 510         *nfds_io=1;
 511         fds[0].fd=st->fd;
 512         fds[0].events=POLLIN;
 513     }
 514     return 0;
 515 }
 516
 517 static void log_from_fd_afterpoll(void *sst, struct pollfd *fds, int nfds)
 518 {
 519     struct fdlog *st=sst;
 520     int r,remain,i;
 521
 522     if (nfds==0) return;
 523     if (fds[0].revents&POLLERR) {
 524         st->finished=True;
 525     }
 526     if (fds[0].revents&POLLIN) {
 527         remain=FDLOG_BUFSIZE-st->i-1;
 528         if (remain<=0) {
 529             st->buffer[FDLOG_BUFSIZE-1]=0;
 530             slilog(st->log,M_WARNING,"%s: overlong line: %s",
 531                          st->prefix,st->buffer);
 532             st->i=0;
 533             remain=FDLOG_BUFSIZE-1;
 534         }
 535         r=read(st->fd,st->buffer+st->i,remain);
 536         if (r>0) {
 537             st->i+=r;
 538             for (i=0; i<st->i; i++) {
 539                 if (st->buffer[i]=='\n') {
 540                     st->buffer[i]=0;
 541                     slilog(st->log,M_INFO,"%s: %s",
 542                                  st->prefix,st->buffer);
 543                     i++;
 544                     memmove(st->buffer,st->buffer+i,st->i-i);
 545                     st->i-=i;
 546                     i=-1;
 547                 }
 548             }
 549         } else {
 550             Message(M_WARNING,"log_from_fd: %s\n",strerror(errno));
 551             st->finished=True;
 552         }
 553     }
 554 }
 555
 556 void log_from_fd(int fd, cstring_t prefix, struct log_if *log)
 557 {
 558     struct fdlog *st;
 559
 560     st=safe_malloc(sizeof(*st),"log_from_fd");
 561     st->log=log;
 562     st->fd=fd;
 563     st->prefix=prefix;
 564     st->buffer=safe_malloc(FDLOG_BUFSIZE,"log_from_fd");
 565     st->i=0;
 566     st->finished=False;
 567
 568     register_for_poll(st,log_from_fd_beforepoll,log_from_fd_afterpoll,1,
 569                       prefix);
 570 }
 571
 572 void log_module(dict_t *dict)
 573 {
 574     add_closure(dict,"logfile",logfile_apply);
 575     add_closure(dict,"syslog",syslog_apply);
 576 }