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logger.c

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/*
 * Asterisk Logger
 * 
 * Mark Spencer <markster@marko.net>
 *
 * Copyright(C)1999, Linux Support Services, Inc.
 * 
 * Distributed under the terms of the GNU General Public License (GPL) Version 2
 *
 * Logging routines
 *
 */

#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include <asterisk/lock.h>
#include <asterisk/options.h>
#include <asterisk/channel.h>
#include <asterisk/config.h>
#include <asterisk/term.h>
#include <asterisk/cli.h>
#include <asterisk/utils.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/stat.h>
#include "asterisk.h"
#include "astconf.h"

#define SYSLOG_NAMES /* so we can map syslog facilities names to their numeric values,
              from <syslog.h> which is included by logger.h */
#include <syslog.h>
static int syslog_level_map[] = {
   LOG_DEBUG,
   LOG_INFO,    /* arbitrary equivalent of LOG_EVENT */
   LOG_NOTICE,
   LOG_WARNING,
   LOG_ERR,
   LOG_DEBUG
};

#define SYSLOG_NLEVELS 6

#include <asterisk/logger.h>

#define MAX_MSG_QUEUE 200

static char dateformat[256] = "%b %e %T";    /* Original Asterisk Format */
AST_MUTEX_DEFINE_STATIC(msglist_lock);
AST_MUTEX_DEFINE_STATIC(loglock);
static int pending_logger_reload = 0;

static struct msglist {
   char *msg;
   struct msglist *next;
} *list = NULL, *last = NULL;

static char hostname[256];

struct logchannel {
   int logmask;
   int facility; /* syslog */
   int syslog; /* syslog flag */
   int console;  /* console logging */
   FILE *fileptr; /* logfile logging */
   char filename[256];
   struct logchannel *next;
};

static struct logchannel *logchannels = NULL;

static int msgcnt = 0;

static FILE *eventlog = NULL;

static char *levels[] = {
   "DEBUG",
   "EVENT",
   "NOTICE",
   "WARNING",
   "ERROR",
   "VERBOSE"
};

static int colors[] = {
   COLOR_BRGREEN,
   COLOR_BRBLUE,
   COLOR_YELLOW,
   COLOR_BRRED,
   COLOR_RED,
   COLOR_GREEN
};

static int make_components(char *s, int lineno)
{
   char *w;
   int res = 0;
   char *stringp=NULL;
   stringp=s;
   w = strsep(&stringp, ",");
   while(w) {
       while(*w && (*w < 33))
      w++;
       if (!strcasecmp(w, "error")) 
      res |= (1 << __LOG_ERROR);
       else if (!strcasecmp(w, "warning"))
      res |= (1 << __LOG_WARNING);
       else if (!strcasecmp(w, "notice"))
      res |= (1 << __LOG_NOTICE);
       else if (!strcasecmp(w, "event"))
      res |= (1 << __LOG_EVENT);
       else if (!strcasecmp(w, "debug"))
      res |= (1 << __LOG_DEBUG);
       else if (!strcasecmp(w, "verbose"))
      res |= (1 << __LOG_VERBOSE);
       else {
      fprintf(stderr, "Logfile Warning: Unknown keyword '%s' at line %d of logger.conf\n", w, lineno);
       }
       w = strsep(&stringp, ",");
   }
   return res;
}

static struct logchannel *make_logchannel(char *channel, char *components, int lineno)
{
   struct logchannel *chan;
   char *facility;
   CODE *cptr;

   if (ast_strlen_zero(channel))
      return NULL;
   chan = malloc(sizeof(struct logchannel));

   if (chan) {
      memset(chan, 0, sizeof(struct logchannel));
      if (!strcasecmp(channel, "console")) {
          chan->console = 1;
      } else if (!strncasecmp(channel, "syslog", 6)) {
          /*
           * syntax is:
           *  syslog.facility => level,level,level
           */
          facility = strchr(channel, '.');
          if(!facility++ || !facility) {
         facility = "local0";
          }
          /*
           * Walk through the list of facilitynames (defined in sys/syslog.h)
           * to see if we can find the one we have been given
           */
          chan->facility = -1;
          cptr = facilitynames;
          while (cptr->c_name) {
         if (!strncasecmp(facility, cptr->c_name, sizeof(cptr->c_name))) {
             chan->facility = cptr->c_val;
             break;
         }
         cptr++;
          }
          if (0 > chan->facility) {
         fprintf(stderr, "Logger Warning: bad syslog facility in logger.conf\n");
         free(chan);
         return NULL;
          }

          chan->syslog = 1;
          openlog("asterisk", LOG_PID, chan->facility);
      } else {
         if (channel[0] == '/') {
            if(!ast_strlen_zero(hostname)) { 
               snprintf(chan->filename, sizeof(chan->filename) - 1,"%s.%s", channel, hostname);
            } else {
               strncpy(chan->filename, channel, sizeof(chan->filename) - 1);
            }
         }       
         
         if(!ast_strlen_zero(hostname)) {
            snprintf(chan->filename, sizeof(chan->filename), "%s/%s.%s",(char *)ast_config_AST_LOG_DIR, channel, hostname);
         } else {
            snprintf(chan->filename, sizeof(chan->filename), "%s/%s", (char *)ast_config_AST_LOG_DIR, channel);
         }
         chan->fileptr = fopen(chan->filename, "a");
         if (!chan->fileptr) {
            /* Can't log here, since we're called with a lock */
            fprintf(stderr, "Logger Warning: Unable to open log file '%s': %s\n", chan->filename, strerror(errno));
         }
      }
      chan->logmask = make_components(components, lineno);
   }
   return chan;
}

static void init_logger_chain(void)
{
   struct logchannel *chan, *cur;
   struct ast_config *cfg;
   struct ast_variable *var;
   char *s;

   /* delete our list of log channels */
   ast_mutex_lock(&loglock);
   chan = logchannels;
   while (chan) {
       cur = chan->next;
       free(chan);
       chan = cur;
   }
   logchannels = NULL;
   ast_mutex_unlock(&loglock);
   
   /* close syslog */
   closelog();
   
   cfg = ast_load("logger.conf");
   
   /* If no config file, we're fine */
   if (!cfg)
       return;
   
   ast_mutex_lock(&loglock);
   if ((s = ast_variable_retrieve(cfg, "general", "appendhostname"))) {
      if(ast_true(s)) {
         if(gethostname(hostname, sizeof(hostname))) {
            strncpy(hostname, "unknown", sizeof(hostname)-1);
            ast_log(LOG_WARNING, "What box has no hostname???\n");
         }
      } else
         hostname[0] = '\0';
   } else
      hostname[0] = '\0';
   if ((s = ast_variable_retrieve(cfg, "general", "dateformat"))) {
      strncpy(dateformat, s, sizeof(dateformat) - 1);
   } else
      strncpy(dateformat, "%b %e %T", sizeof(dateformat) - 1);
   var = ast_variable_browse(cfg, "logfiles");
   while(var) {
      chan = make_logchannel(var->name, var->value, var->lineno);
      if (chan) {
         chan->next = logchannels;
         logchannels = chan;
      }
      var = var->next;
   }

   ast_destroy(cfg);
   ast_mutex_unlock(&loglock);
}

static FILE *qlog = NULL;
AST_MUTEX_DEFINE_STATIC(qloglock);

void ast_queue_log(const char *queuename, const char *callid, const char *agent, const char *event, const char *fmt, ...)
{
   va_list ap;
   ast_mutex_lock(&qloglock);
   if (qlog) {
      va_start(ap, fmt);
      fprintf(qlog, "%ld|%s|%s|%s|%s|", (long)time(NULL), callid, queuename, agent, event);
      vfprintf(qlog, fmt, ap);
      fprintf(qlog, "\n");
      va_end(ap);
      fflush(qlog);
   }
   ast_mutex_unlock(&qloglock);
}

static void queue_log_init(void)
{
   char filename[256];
   int reloaded = 0;
   ast_mutex_lock(&qloglock);
   if (qlog) {
      reloaded = 1;
      fclose(qlog);
      qlog = NULL;
   }
   snprintf(filename, sizeof(filename), "%s/%s", (char *)ast_config_AST_LOG_DIR, "queue_log");
   qlog = fopen(filename, "a");
   ast_mutex_unlock(&qloglock);
   if (reloaded) 
      ast_queue_log("NONE", "NONE", "NONE", "CONFIGRELOAD", "%s", "");
   else
      ast_queue_log("NONE", "NONE", "NONE", "QUEUESTART", "%s", "");
}

int reload_logger(int rotate)
{
   char old[AST_CONFIG_MAX_PATH] = "";
   char new[AST_CONFIG_MAX_PATH];
   struct logchannel *f;
   FILE *myf;

   int x;
   ast_mutex_lock(&loglock);
   if (eventlog) 
      fclose(eventlog);
   else 
      rotate = 0;
   eventlog = NULL;



   mkdir((char *)ast_config_AST_LOG_DIR, 0755);
   snprintf(old, sizeof(old), "%s/%s", (char *)ast_config_AST_LOG_DIR, EVENTLOG);

   if(rotate) {
      for(x=0;;x++) {
         snprintf(new, sizeof(new), "%s/%s.%d", (char *)ast_config_AST_LOG_DIR, EVENTLOG,x);
         myf = fopen((char *)new, "r");
         if(myf) 
            fclose(myf);
         else
            break;
      }
   
      /* do it */
      if (rename(old,new))
         fprintf(stderr, "Unable to rename file '%s' to '%s'\n", old, new);
   }

   eventlog = fopen(old, "a");

   f = logchannels;
   while(f) {
      if (f->fileptr && (f->fileptr != stdout) && (f->fileptr != stderr)) {
         fclose(f->fileptr);
         f->fileptr = NULL;
         if(rotate) {
            strncpy(old, f->filename, sizeof(old) - 1);
   
            for(x=0;;x++) {
               snprintf(new, sizeof(new), "%s.%d", f->filename, x);
               myf = fopen((char *)new, "r");
               if (myf) {
                  fclose(myf);
               } else {
                  break;
               }
            }
       
            /* do it */
            if (rename(old,new))
               fprintf(stderr, "Unable to rename file '%s' to '%s'\n", old, new);
         }
      }
      f = f->next;
   }

   ast_mutex_unlock(&loglock);

   queue_log_init();

   if (eventlog) {
      init_logger_chain();
      ast_log(LOG_EVENT, "Restarted Asterisk Event Logger\n");
      if (option_verbose)
         ast_verbose("Asterisk Event Logger restarted\n");
      return 0;
   } else 
      ast_log(LOG_ERROR, "Unable to create event log: %s\n", strerror(errno));
   init_logger_chain();
   pending_logger_reload = 0;
   return -1;
}

static int handle_logger_reload(int fd, int argc, char *argv[])
{
   if(reload_logger(0))
   {
      ast_cli(fd, "Failed to reloadthe logger\n");
      return RESULT_FAILURE;
   }
   else
      return RESULT_SUCCESS;
}

static int handle_logger_rotate(int fd, int argc, char *argv[])
{
   if(reload_logger(1))
   {
      ast_cli(fd, "Failed to reloadthe logger\n");
      return RESULT_FAILURE;
   }
   else
      return RESULT_SUCCESS;
}

static struct verb {
   void (*verboser)(const char *string, int opos, int replacelast, int complete);
   struct verb *next;
} *verboser = NULL;


static char logger_reload_help[] =
"Usage: logger reload\n"
"       Reloads the logger subsystem state.  Use after restarting syslogd(8)\n";

static char logger_rotate_help[] =
"Usage: logger rotate\n"
"       Rotates and Reopens the log files.\n";

static struct ast_cli_entry reload_logger_cli = 
   { { "logger", "reload", NULL }, 
   handle_logger_reload, "Reopens the log files",
   logger_reload_help };

static struct ast_cli_entry rotate_logger_cli = 
   { { "logger", "rotate", NULL }, 
   handle_logger_rotate, "Rotates and reopens the log files",
   logger_rotate_help };

static int handle_SIGXFSZ(int sig) 
{
   /* Indicate need to reload */
   pending_logger_reload = 1;
   return 0;
}

int init_logger(void)
{
   char tmp[256];

   /* auto rotate if sig SIGXFSZ comes a-knockin */
   (void) signal(SIGXFSZ,(void *) handle_SIGXFSZ);

   /* register the relaod logger cli command */
   ast_cli_register(&reload_logger_cli);
   ast_cli_register(&rotate_logger_cli);

   /* initialize queue logger */
   queue_log_init();

   /* create the eventlog */
   mkdir((char *)ast_config_AST_LOG_DIR, 0755);
   snprintf(tmp, sizeof(tmp), "%s/%s", (char *)ast_config_AST_LOG_DIR, EVENTLOG);
   eventlog = fopen((char *)tmp, "a");
   if (eventlog) {
      init_logger_chain();
      ast_log(LOG_EVENT, "Started Asterisk Event Logger\n");
      if (option_verbose)
         ast_verbose("Asterisk Event Logger Started %s\n",(char *)tmp);
      return 0;
   } else 
      ast_log(LOG_ERROR, "Unable to create event log: %s\n", strerror(errno));

   /* create log channels */
   init_logger_chain();
   return -1;
}

void close_logger(void)
{
   struct msglist *m, *tmp;

   ast_mutex_lock(&msglist_lock);
   m = list;
   while(m) {
      if (m->msg) {
         free(m->msg);
      }
      tmp = m->next;
      free(m);
      m = tmp;
   }
   list = last = NULL;
   msgcnt = 0;
   ast_mutex_unlock(&msglist_lock);
   return;
}

static void ast_log_vsyslog(int level, const char *file, int line, const char *function, const char *fmt, va_list args) 
{
   char buf[BUFSIZ];

   if (level >= SYSLOG_NLEVELS) {
      /* we are locked here, so cannot ast_log() */
      fprintf(stderr, "ast_log_vsyslog called with bogus level: %d\n", level);
      return;
   }
   if (level == __LOG_VERBOSE) {
      snprintf(buf, sizeof(buf), "VERBOSE[%ld]: ", (long)pthread_self());
      level = __LOG_DEBUG;
   } else {
      snprintf(buf, sizeof(buf), "%s[%ld]: %s:%d in %s: ",
         levels[level], (long)pthread_self(), file, line, function);
   }
   vsnprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), fmt, args);
   syslog(syslog_level_map[level], "%s", buf);
}

/*
 * send log messages to syslog and/or the console
 */
void ast_log(int level, const char *file, int line, const char *function, const char *fmt, ...)
{
   struct logchannel *chan;
   char buf[BUFSIZ];
   time_t t;
   struct tm tm;
   char date[256];

   va_list ap;
   
   if (!option_verbose && !option_debug && (level == __LOG_DEBUG)) {
      return;
   }

   /* begin critical section */
   ast_mutex_lock(&loglock);

   time(&t);
   localtime_r(&t, &tm);
   strftime(date, sizeof(date), dateformat, &tm);

   if (level == __LOG_EVENT) {
      va_start(ap, fmt);

      fprintf(eventlog, "%s asterisk[%d]: ", date, getpid());
      vfprintf(eventlog, fmt, ap);
      fflush(eventlog);

      va_end(ap);
      ast_mutex_unlock(&loglock);
      return;
   }

   if (logchannels) {
      chan = logchannels;
      while(chan) {
         if (chan->syslog && (chan->logmask & (1 << level))) {
            va_start(ap, fmt);
            ast_log_vsyslog(level, file, line, function, fmt, ap);
            va_end(ap);
         } else if ((chan->logmask & (1 << level)) && (chan->console)) {
            char linestr[128];
            char tmp1[80], tmp2[80], tmp3[80], tmp4[80];

            if (level != __LOG_VERBOSE) {
               sprintf(linestr, "%d", line);
               snprintf(buf, sizeof(buf), "%s %s[%ld]: %s:%s %s: ",
                  date,
                  term_color(tmp1, levels[level], colors[level], 0, sizeof(tmp1)),
                  (long)pthread_self(),
                  term_color(tmp2, file, COLOR_BRWHITE, 0, sizeof(tmp2)),
                  term_color(tmp3, linestr, COLOR_BRWHITE, 0, sizeof(tmp3)),
                  term_color(tmp4, function, COLOR_BRWHITE, 0, sizeof(tmp4)));
          
               ast_console_puts(buf);
               va_start(ap, fmt);
               vsnprintf(buf, sizeof(buf), fmt, ap);
               va_end(ap);
               ast_console_puts(buf);
            }
         } else if ((chan->logmask & (1 << level)) && (chan->fileptr)) {
            snprintf(buf, sizeof(buf), "%s %s[%ld]: ", date,
               levels[level], (long)pthread_self());
            fprintf(chan->fileptr, buf);
            va_start(ap, fmt);
            vsnprintf(buf, sizeof(buf), fmt, ap);
            va_end(ap);
            fputs(buf, chan->fileptr);
            fflush(chan->fileptr);
         }
         chan = chan->next;
      }
   } else {
      /* 
       * we don't have the logger chain configured yet,
       * so just log to stdout 
      */
      if (level != __LOG_VERBOSE) {
         va_start(ap, fmt);
         vsnprintf(buf, sizeof(buf), fmt, ap);
         va_end(ap);
         fputs(buf, stdout);
      }
   }

   ast_mutex_unlock(&loglock);
   /* end critical section */
   if (pending_logger_reload) {
      reload_logger(1);
      ast_log(LOG_EVENT,"Rotated Logs Per SIGXFSZ\n");
      if (option_verbose)
         ast_verbose("Rotated Logs Per SIGXFSZ\n");
   }
}

extern void ast_verbose(const char *fmt, ...)
{
   static char stuff[4096];
   static int pos = 0, opos;
   static int replacelast = 0, complete;
   struct msglist *m;
   struct verb *v;
   va_list ap;
   va_start(ap, fmt);
   ast_mutex_lock(&msglist_lock);
   vsnprintf(stuff + pos, sizeof(stuff) - pos, fmt, ap);
   opos = pos;
   pos = strlen(stuff);
   if (fmt[strlen(fmt)-1] == '\n') 
      complete = 1;
   else
      complete=0;
   if (complete) {
      if (msgcnt < MAX_MSG_QUEUE) {
         /* Allocate new structure */
         m = malloc(sizeof(struct msglist));
         msgcnt++;
      } else {
         /* Recycle the oldest entry */
         m = list;
         list = list->next;
         free(m->msg);
      }
      if (m) {
         m->msg = strdup(stuff);
         if (m->msg) {
            if (last)
               last->next = m;
            else
               list = m;
            m->next = NULL;
            last = m;
         } else {
            msgcnt--;
            ast_log(LOG_ERROR, "Out of memory\n");
            free(m);
         }
      }
   }
   if (verboser) {
      v = verboser;
      while(v) {
         v->verboser(stuff, opos, replacelast, complete);
         v = v->next;
      }
   } /* else
      fprintf(stdout, stuff + opos); */

   ast_log(LOG_VERBOSE, stuff);

   if (fmt[strlen(fmt)-1] != '\n') 
      replacelast = 1;
   else 
      replacelast = pos = 0;
   va_end(ap);

   ast_mutex_unlock(&msglist_lock);
}

int ast_verbose_dmesg(void (*v)(const char *string, int opos, int replacelast, int complete))
{
   struct msglist *m;
   ast_mutex_lock(&msglist_lock);
   m = list;
   while(m) {
      /* Send all the existing entries that we have queued (i.e. they're likely to have missed) */
      v(m->msg, 0, 0, 1);
      m = m->next;
   }
   ast_mutex_unlock(&msglist_lock);
   return 0;
}

int ast_register_verbose(void (*v)(const char *string, int opos, int replacelast, int complete)) 
{
   struct msglist *m;
   struct verb *tmp;
   /* XXX Should be more flexible here, taking > 1 verboser XXX */
   if ((tmp = malloc(sizeof (struct verb)))) {
      tmp->verboser = v;
      ast_mutex_lock(&msglist_lock);
      tmp->next = verboser;
      verboser = tmp;
      m = list;
      while(m) {
         /* Send all the existing entries that we have queued (i.e. they're likely to have missed) */
         v(m->msg, 0, 0, 1);
         m = m->next;
      }
      ast_mutex_unlock(&msglist_lock);
      return 0;
   }
   return -1;
}

int ast_unregister_verbose(void (*v)(const char *string, int opos, int replacelast, int complete))
{
   int res = -1;
   struct verb *tmp, *tmpl=NULL;
   ast_mutex_lock(&msglist_lock);
   tmp = verboser;
   while(tmp) {
      if (tmp->verboser == v) {
         if (tmpl)
            tmpl->next = tmp->next;
         else
            verboser = tmp->next;
         free(tmp);
         break;
      }
      tmpl = tmp;
      tmp = tmp->next;
   }
   if (tmp)
      res = 0;
   ast_mutex_unlock(&msglist_lock);
   return res;
}

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