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 void lg_vperror(struct log_if *lg, const char *desc, struct cloc *loc,
 193                 int class, int errnoval, const char *fmt, va_list al)
 194 {
 195     int status=current_phase;
 196     int esave=errno;
 197
 198     if (!lg)
 199         lg=system_log;
 200
 201     if (class & M_FATAL)
 202         enter_phase(PHASE_SHUTDOWN);
 203
 204     slilog_part(lg,class,"%s",desc);
 205     if (loc)
 206         slilog_part(lg,class," (%s:%d)",loc->file,loc->line);
 207     slilog_part(lg,class,": ");
 208     vslilog_part(lg,class,fmt,al);
 209     if (errnoval)
 210         slilog_part(lg,class,": %s",strerror(errnoval));
 211     slilog_part(lg,class,"\n");
 212
 213     if (class & M_FATAL)
 214         exit(status);
 215
 216     errno=esave;
 217 }
 218
 219 void lg_perror(struct log_if *lg, const char *desc, struct cloc *loc,
 220                int class, int errnoval, const char *fmt, ...)
 221 {
 222     va_list al;
 223     va_start(al,fmt);
 224     lg_vperror(lg,desc,loc,class,errnoval,fmt,al);
 225     va_end(al);
 226 }
 227
 228 struct log_if *init_log(list_t *ll)
 229 {
 230     int i=0;
 231     item_t *item;
 232     closure_t *cl;
 233     struct loglist *l=NULL, *n;
 234     struct log_if *r;
 235
 236     if (list_length(ll)==1) {
 237         item=list_elem(ll,0);
 238         cl=item->data.closure;
 239         if (cl->type!=CL_LOG) {
 240             cfgfatal(item->loc,"init_log","closure is not a logger");
 241         }
 242         return cl->interface;
 243     }
 244     while ((item=list_elem(ll,i++))) {
 245         if (item->type!=t_closure) {
 246             cfgfatal(item->loc,"init_log","item is not a closure");
 247         }
 248         cl=item->data.closure;
 249         if (cl->type!=CL_LOG) {
 250             cfgfatal(item->loc,"init_log","closure is not a logger");
 251         }
 252         n=safe_malloc(sizeof(*n),"init_log");
 253         n->l=cl->interface;
 254         n->next=l;
 255         l=n;
 256     }
 257     if (!l) {
 258         fatal("init_log: no log");
 259     }
 260     r=safe_malloc(sizeof(*r), "init_log");
 261     r->st=l;
 262     r->vlogfn=log_vmulti;
 263     r->buff[0]=0;
 264     return r;
 265 }
 266
 267 struct logfile {
 268     closure_t cl;
 269     struct log_if ops;
 270     struct cloc loc;
 271     string_t logfile;
 272     uint32_t level;
 273     FILE *f;
 274 };
 275
 276 static cstring_t months[]={
 277     "Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
 278
 279 static void logfile_vlog(void *sst, int class, const char *message,
 280                          va_list args)
 281 {
 282     struct logfile *st=sst;
 283     time_t t;
 284     struct tm *tm;
 285
 286     if (secnet_is_daemon && st->f) {
 287         if (class&st->level) {
 288             t=time(NULL);
 289             tm=localtime(&t);
 290             fprintf(st->f,"%s %2d %02d:%02d:%02d ",
 291                     months[tm->tm_mon],tm->tm_mday,tm->tm_hour,tm->tm_min,
 292                     tm->tm_sec);
 293             vfprintf(st->f,message,args);
 294             fprintf(st->f,"\n");
 295             fflush(st->f);
 296         }
 297     } else {
 298         vMessageFallback(class,message,args);
 299         MessageFallback(class,"\n");
 300     }
 301 }
 302
 303 static void logfile_log(void *state, int class, const char *message, ...)
 304     FORMAT(printf,3,4);
 305 static void logfile_log(void *state, int class, const char *message, ...)
 306 {
 307     va_list ap;
 308
 309     va_start(ap,message);
 310     logfile_vlog(state,class,message,ap);
 311     va_end(ap);
 312 }
 313
 314 static void logfile_hup_notify(void *sst, int signum)
 315 {
 316     struct logfile *st=sst;
 317     FILE *f;
 318     f=fopen(st->logfile,"a");
 319     if (!f) {
 320         logfile_log(st,M_FATAL,"received SIGHUP, but could not reopen "
 321                     "logfile: %s",strerror(errno));
 322     } else {
 323         fclose(st->f);
 324         st->f=f;
 325         logfile_log(st,M_INFO,"received SIGHUP");
 326     }
 327 }
 328
 329 static void logfile_phase_hook(void *sst, uint32_t new_phase)
 330 {
 331     struct logfile *st=sst;
 332     FILE *f;
 333
 334     if (background) {
 335         f=fopen(st->logfile,"a");
 336         if (!f) fatal_perror("logfile (%s:%d): cannot open \"%s\"",
 337                              st->loc.file,st->loc.line,st->logfile);
 338         st->f=f;
 339         request_signal_notification(SIGHUP, logfile_hup_notify,st);
 340     }
 341 }
 342
 343 static struct flagstr message_class_table[]={
 344     { "debug-config", M_DEBUG_CONFIG },
 345     { "debug-phase", M_DEBUG_PHASE },
 346     { "debug", M_DEBUG },
 347     { "all-debug", M_DEBUG|M_DEBUG_PHASE|M_DEBUG_CONFIG },
 348     { "info", M_INFO },
 349     { "notice", M_NOTICE },
 350     { "warning", M_WARNING },
 351     { "error", M_ERR },
 352     { "security", M_SECURITY },
 353     { "fatal", M_FATAL },
 354     { "default", M_WARNING|M_ERR|M_SECURITY|M_FATAL },
 355     { "verbose", M_INFO|M_NOTICE|M_WARNING|M_ERR|M_SECURITY|M_FATAL },
 356     { "quiet", M_FATAL },
 357     { NULL, 0 }
 358 };
 359
 360 static list_t *logfile_apply(closure_t *self, struct cloc loc, dict_t *context,
 361                              list_t *args)
 362 {
 363     struct logfile *st;
 364     item_t *item;
 365     dict_t *dict;
 366
 367     /* We should defer opening the logfile until the getresources
 368        phase.  We should defer writing into the logfile until after we
 369        become a daemon. */
 370
 371     st=safe_malloc(sizeof(*st),"logfile_apply");
 372     st->cl.description="logfile";
 373     st->cl.type=CL_LOG;
 374     st->cl.apply=NULL;
 375     st->cl.interface=&st->ops;
 376     st->ops.st=st;
 377     st->ops.vlogfn=logfile_vlog;
 378     st->ops.buff[0]=0;
 379     st->loc=loc;
 380     st->f=NULL;
 381
 382     item=list_elem(args,0);
 383     if (!item || item->type!=t_dict) {
 384         cfgfatal(loc,"logfile","argument must be a dictionary\n");
 385     }
 386     dict=item->data.dict;
 387
 388     st->logfile=dict_read_string(dict,"filename",True,"logfile",loc);
 389     st->level=string_list_to_word(dict_lookup(dict,"class"),
 390                                        message_class_table,"logfile");
 391
 392     add_hook(PHASE_GETRESOURCES,logfile_phase_hook,st);
 393
 394     return new_closure(&st->cl);
 395 }
 396
 397 struct syslog {
 398     closure_t cl;
 399     struct log_if ops;
 400     string_t ident;
 401     int facility;
 402     bool_t open;
 403 };
 404
 405 static int msgclass_to_syslogpriority(uint32_t m)
 406 {
 407     switch (m) {
 408     case M_DEBUG_CONFIG: return LOG_DEBUG;
 409     case M_DEBUG_PHASE: return LOG_DEBUG;
 410     case M_DEBUG: return LOG_DEBUG;
 411     case M_INFO: return LOG_INFO;
 412     case M_NOTICE: return LOG_NOTICE;
 413     case M_WARNING: return LOG_WARNING;
 414     case M_ERR: return LOG_ERR;
 415     case M_SECURITY: return LOG_CRIT;
 416     case M_FATAL: return LOG_EMERG;
 417     default: return LOG_NOTICE;
 418     }
 419 }
 420
 421 static void syslog_vlog(void *sst, int class, const char *message,
 422                          va_list args)
 423     FORMAT(printf,3,0);
 424 static void syslog_vlog(void *sst, int class, const char *message,
 425                          va_list args)
 426 {
 427     struct syslog *st=sst;
 428
 429     if (st->open)
 430         vsyslog(msgclass_to_syslogpriority(class),message,args);
 431     else {
 432         vMessageFallback(class,message,args);
 433         MessageFallback(class,"\n");
 434     }
 435 }
 436
 437 static struct flagstr syslog_facility_table[]={
 438 #ifdef LOG_AUTH
 439     { "auth", LOG_AUTH },
 440 #endif
 441 #ifdef LOG_AUTHPRIV
 442     { "authpriv", LOG_AUTHPRIV },
 443 #endif
 444     { "cron", LOG_CRON },
 445     { "daemon", LOG_DAEMON },
 446     { "kern", LOG_KERN },
 447     { "local0", LOG_LOCAL0 },
 448     { "local1", LOG_LOCAL1 },
 449     { "local2", LOG_LOCAL2 },
 450     { "local3", LOG_LOCAL3 },
 451     { "local4", LOG_LOCAL4 },
 452     { "local5", LOG_LOCAL5 },
 453     { "local6", LOG_LOCAL6 },
 454     { "local7", LOG_LOCAL7 },
 455     { "lpr", LOG_LPR },
 456     { "mail", LOG_MAIL },
 457     { "news", LOG_NEWS },
 458     { "syslog", LOG_SYSLOG },
 459     { "user", LOG_USER },
 460     { "uucp", LOG_UUCP },
 461     { NULL, 0 }
 462 };
 463
 464 static void syslog_phase_hook(void *sst, uint32_t newphase)
 465 {
 466     struct syslog *st=sst;
 467
 468     if (background) {
 469         openlog(st->ident,0,st->facility);
 470         st->open=True;
 471     }
 472 }
 473
 474 static list_t *syslog_apply(closure_t *self, struct cloc loc, dict_t *context,
 475                             list_t *args)
 476 {
 477     struct syslog *st;
 478     dict_t *d;
 479     item_t *item;
 480     string_t facstr;
 481
 482     st=safe_malloc(sizeof(*st),"syslog_apply");
 483     st->cl.description="syslog";
 484     st->cl.type=CL_LOG;
 485     st->cl.apply=NULL;
 486     st->cl.interface=&st->ops;
 487     st->ops.st=st;
 488     st->ops.vlogfn=syslog_vlog;
 489     st->ops.buff[0]=0;
 490
 491     item=list_elem(args,0);
 492     if (!item || item->type!=t_dict)
 493         cfgfatal(loc,"syslog","parameter must be a dictionary\n");
 494     d=item->data.dict;
 495
 496     st->ident=dict_read_string(d, "ident", False, "syslog", loc);
 497     facstr=dict_read_string(d, "facility", True, "syslog", loc);
 498     st->facility=string_to_word(facstr,loc,
 499                                 syslog_facility_table,"syslog");
 500     st->open=False;
 501     add_hook(PHASE_GETRESOURCES,syslog_phase_hook,st);
 502
 503     return new_closure(&st->cl);
 504 }
 505
 506 /* Read from a fd and output to a log.  This is a quick hack to
 507    support logging stderr, and needs code adding to tidy up before it
 508    can be used for anything else. */
 509 #define FDLOG_BUFSIZE 1024
 510 struct fdlog {
 511     struct log_if *log;
 512     int fd;
 513     cstring_t prefix;
 514     string_t buffer;
 515     int i;
 516     bool_t finished;
 517 };
 518
 519 static int log_from_fd_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
 520                                   int *timeout_io)
 521 {
 522     struct fdlog *st=sst;
 523     if (!st->finished) {
 524         BEFOREPOLL_WANT_FDS(1);
 525         fds[0].fd=st->fd;
 526         fds[0].events=POLLIN;
 527     } else {
 528         BEFOREPOLL_WANT_FDS(0);
 529     }
 530     return 0;
 531 }
 532
 533 static void log_from_fd_afterpoll(void *sst, struct pollfd *fds, int nfds)
 534 {
 535     struct fdlog *st=sst;
 536     int r,remain,i;
 537
 538     if (nfds==0) return;
 539     if (fds[0].revents&POLLERR) {
 540         st->finished=True;
 541     }
 542     if (fds[0].revents&POLLIN) {
 543         remain=FDLOG_BUFSIZE-st->i-1;
 544         if (remain<=0) {
 545             st->buffer[FDLOG_BUFSIZE-1]=0;
 546             slilog(st->log,M_WARNING,"%s: overlong line: %s",
 547                          st->prefix,st->buffer);
 548             st->i=0;
 549             remain=FDLOG_BUFSIZE-1;
 550         }
 551         r=read(st->fd,st->buffer+st->i,remain);
 552         if (r>0) {
 553             st->i+=r;
 554             for (i=0; i<st->i; i++) {
 555                 if (st->buffer[i]=='\n') {
 556                     st->buffer[i]=0;
 557                     slilog(st->log,M_INFO,"%s: %s",
 558                                  st->prefix,st->buffer);
 559                     i++;
 560                     memmove(st->buffer,st->buffer+i,st->i-i);
 561                     st->i-=i;
 562                     i=-1;
 563                 }
 564             }
 565         } else {
 566             Message(M_WARNING,"log_from_fd: %s\n",strerror(errno));
 567             st->finished=True;
 568         }
 569     }
 570 }
 571
 572 void log_from_fd(int fd, cstring_t prefix, struct log_if *log)
 573 {
 574     struct fdlog *st;
 575
 576     st=safe_malloc(sizeof(*st),"log_from_fd");
 577     st->log=log;
 578     st->fd=fd;
 579     st->prefix=prefix;
 580     st->buffer=safe_malloc(FDLOG_BUFSIZE,"log_from_fd");
 581     st->i=0;
 582     st->finished=False;
 583
 584     register_for_poll(st,log_from_fd_beforepoll,log_from_fd_afterpoll,
 585                       prefix);
 586 }
 587
 588 void log_module(dict_t *dict)
 589 {
 590     add_closure(dict,"logfile",logfile_apply);
 591     add_closure(dict,"syslog",syslog_apply);
 592 }