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-rw-r--r--liblog/logger.c519
1 files changed, 519 insertions, 0 deletions
diff --git a/liblog/logger.c b/liblog/logger.c
new file mode 100644
index 0000000..2fe40cc
--- /dev/null
+++ b/liblog/logger.c
@@ -0,0 +1,519 @@
+/*
+** Copyright 1998 - 2006 Double Precision, Inc.
+** See COPYING for distribution information.
+*/
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <grp.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if HAVE_SYSLOG_H
+#include <syslog.h>
+#else
+#undef TESTMODE
+#define TESTMODE 1
+#endif
+#include "../liblock/config.h"
+#include "../liblock/liblock.h"
+#include "../numlib/numlib.h"
+
+
+static int do_logger(const char *name, int facility, FILE *f)
+{
+char buf[512];
+char *p;
+int c;
+
+#if TESTMODE
+
+#else
+ openlog(name, 0
+
+#ifdef LOG_NDELAY
+ | LOG_NDELAY
+#else
+ | LOG_NOWAIT
+#endif
+
+ , facility);
+#endif
+ if (chdir("/") < 0)
+ {
+ perror("chdir(\"/\")");
+ exit(1);
+ }
+
+ while (fgets(buf, sizeof(buf), f))
+ {
+ if ((p=strchr(buf, '\n')) != 0) *p=0;
+ else
+ while ((c=getchar()) != EOF && c != '\n')
+ ;
+
+#if TESTMODE
+ fprintf(stderr, "%s: %s\n", name, buf);
+#else
+ c=LOG_INFO;
+ if (strncmp(buf, "ERR:", 4) == 0)
+ {
+ c=LOG_ERR;
+ p=buf+4;
+ }
+ else if (strncmp(buf, "WARN:", 5) == 0)
+ {
+ c=LOG_WARNING;
+ p=buf+5;
+ }
+ else if (strncmp(buf, "ALERT:", 6) == 0)
+ {
+ c=LOG_ALERT;
+ p=buf+6;
+ }
+ else if (strncmp(buf, "CRIT:", 5) == 0)
+ {
+ c=LOG_CRIT;
+ p=buf+5;
+ }
+ else if (strncmp(buf, "DEBUG:", 6) == 0)
+ {
+ c=LOG_DEBUG;
+ p=buf+6;
+ }
+ else if (strncmp(buf, "INFO:", 5) == 0)
+ p=buf+5;
+ else p=buf;
+
+ while (*p == ' ')
+ ++p;
+
+ syslog(c, "%s", p);
+#endif
+ }
+ return (0);
+}
+
+static const char *namearg=0;
+static const char *pidarg=0;
+static char *lockfilename=0;
+
+struct lognames
+{
+ char *name;
+ int value;
+};
+
+static struct lognames facilitynames[] =
+{
+#ifdef LOG_AUTH
+ { "auth", LOG_AUTH },
+#endif
+#ifdef LOG_AUTHPRIV
+ { "authpriv", LOG_AUTHPRIV },
+#endif
+#ifdef LOG_CONSOLE
+ { "console", LOG_CONSOLE },
+#endif
+#ifdef LOG_CRON
+ { "cron", LOG_CRON },
+#endif
+#ifdef LOG_DAEMON
+ { "daemon", LOG_DAEMON },
+#endif
+#ifdef LOG_FTP
+ { "ftp", LOG_FTP },
+#endif
+#ifdef LOG_KERN
+ { "kern", LOG_KERN },
+#endif
+#ifdef LOG_LPR
+ { "lpr", LOG_LPR },
+#endif
+#ifdef LOG_MAIL
+ { "mail", LOG_MAIL },
+#endif
+#ifdef LOG_AUTHPRIV
+ { "news", LOG_NEWS },
+#endif
+#ifdef LOG_SECURITY
+ { "security", LOG_SECURITY },
+#endif
+#ifdef LOG_USER
+ { "user", LOG_USER },
+#endif
+#ifdef LOG_UUCP
+ { "uucp", LOG_UUCP },
+#endif
+#ifdef LOG_LOCAL0
+ { "local0", LOG_LOCAL0 },
+#endif
+#ifdef LOG_LOCAL1
+ { "local1", LOG_LOCAL1 },
+#endif
+#ifdef LOG_LOCAL2
+ { "local2", LOG_LOCAL2 },
+#endif
+#ifdef LOG_LOCAL3
+ { "local3", LOG_LOCAL3 },
+#endif
+#ifdef LOG_LOCAL4
+ { "local4", LOG_LOCAL4 },
+#endif
+#ifdef LOG_LOCAL5
+ { "local5", LOG_LOCAL5 },
+#endif
+#ifdef LOG_LOCAL6
+ { "local6", LOG_LOCAL6 },
+#endif
+#ifdef LOG_LOCAL7
+ { "local7", LOG_LOCAL7 },
+#endif
+ { 0, 0 }
+};
+
+static int hup_restart = 0;
+static int respawn = 0;
+static int child_pid = -1;
+
+static RETSIGTYPE sighup(int n)
+{
+ if (child_pid > 0)
+ {
+ /* The child may respond to HUP by dying. If so it will
+ close its stderr and do_logger will terminate; at that
+ point we need to restart it */
+ hup_restart = 1;
+ kill (child_pid, SIGHUP);
+ }
+ signal(SIGHUP, sighup);
+#if RETSIGTYPE != void
+ return (1);
+#endif
+}
+
+static RETSIGTYPE sigalrm(int n)
+{
+ if (child_pid > 0) kill(child_pid, SIGKILL);
+#if RETSIGTYPE != void
+ return (1);
+#endif
+}
+
+static RETSIGTYPE sigterm(int n)
+{
+ if (child_pid > 0)
+ {
+ hup_restart = 0;
+ respawn = 0;
+ kill(child_pid, SIGTERM);
+ signal(SIGALRM, sigalrm); /* kill after 8 secs */
+ alarm(8);
+ }
+ else exit(0);
+#if RETSIGTYPE != void
+ return (1);
+#endif
+}
+
+static void checkfd(int actual, int exp)
+{
+ if (actual == exp) return;
+ fprintf(stderr, "Bad fd, got %d, expected %d\n", actual, exp);
+ if (actual < 0) perror("error");
+ exit(1);
+}
+
+static int isid(const char *p)
+{
+ while (*p)
+ {
+ if (*p < '0' || *p > '9') return (0);
+ ++p;
+ }
+ return (1);
+}
+
+static void setuidgid(const char *userarg,
+ const char *grouparg)
+{
+ if (grouparg)
+ {
+ gid_t gid = 0;
+ struct group *gr;
+
+ if (isid(grouparg))
+ gid=atoi(grouparg);
+ else if ((gr=getgrnam(grouparg)) == 0)
+ {
+ fprintf(stderr, "Group not found: %s\n", grouparg);
+ exit(1);
+ }
+ else gid=gr->gr_gid;
+
+ libmail_changegroup(gid);
+ }
+
+ if (userarg)
+ {
+ uid_t uid;
+
+ if (isid(userarg))
+ {
+ uid=atoi(userarg);
+ libmail_changeuidgid(uid, getgid());
+ }
+ else
+ {
+ gid_t g=getgid(), *gp=0;
+
+ if (grouparg) gp= &g;
+ libmail_changeusername(userarg, gp);
+ }
+ }
+}
+
+
+static void startchild(char **argv, const char *userarg, const char *grouparg)
+{
+pid_t p;
+int pipefd[2];
+int tmp;
+
+ signal(SIGTERM, sigterm);
+ signal(SIGHUP, sighup);
+
+ /* Make sure the pipefds are at least 3 and 4. If we have an open
+ stderr then keep it around for debugging purposes. */
+ close(0);
+ checkfd(open("/dev/null", O_RDWR), 0);
+ close(1);
+ checkfd(dup(0), 1);
+ if ((tmp = dup(0)) > 2) close(tmp);
+
+ if (pipe(pipefd) < 0)
+ {
+ perror("pipe");
+ exit(1);
+ }
+ p = fork();
+ if (p < 0)
+ {
+ perror("fork");
+ exit(1);
+ }
+ if (p == 0)
+ {
+
+ close(pipefd[0]);
+ close(2);
+ checkfd(dup(pipefd[1]), 2);
+ close(pipefd[1]);
+ setuidgid(userarg, grouparg);
+ execvp(argv[0], argv);
+ perror("exec");
+ exit(1);
+ }
+
+ // We can close stderr now
+
+ close(2);
+ checkfd(dup(0), 2);
+
+
+ close(pipefd[1]);
+ close(0);
+ checkfd(dup(pipefd[0]), 0);
+ close(pipefd[0]);
+ child_pid = p;
+}
+/*
+ * Note that we now support several modes of operation:
+ *
+ * (1) standalone logger, just collect messages on stdin and feed to syslog
+ * courierlogger foo
+ * courierlogger -name=foo
+ *
+ * (2) run a child process, collect its stderr messages and feed to syslog
+ * courierlogger [-name=foo] foo arg1 arg2
+ *
+ * (3) start a detached daemon with a child process
+ * courierlogger [-name=foo] -pid=/var/run/foo.pid -start foo arg1 arg2
+ *
+ * (4) stop or restart a detached daemon
+ * courierlogger -pid=/var/run/foo.pid -stop (or receive a SIGTERM)
+ * courierlogger -pid=/var/run/foo.pid -restart (or receive a SIGHUP)
+ */
+
+int main(int argc, char **argv)
+{
+int facility = LOG_DEST;
+int daemon = 0;
+int lockfd = -1;
+const char *userarg = 0;
+const char *grouparg = 0;
+int droproot=0;
+
+ if (argc == 2 && argv[1][0] != '-')
+ {
+ /* backwards-compatibility mode */
+ close(1);
+ close(2);
+ checkfd(open("/dev/null", O_WRONLY), 1);
+ checkfd(open("/dev/null", O_WRONLY), 2);
+ do_logger(argv[1], facility, stdin);
+ exit(0);
+ }
+
+ if (argc <= 1)
+ {
+ fprintf(stderr,
+
+ "Usage: courierlogger [-name=name] [-pid=pidfile] [-facility=type]\n"
+ " [-start|-stop|-restart] [cmd [args...]]\n"
+ );
+ exit(1);
+ }
+
+ argv++, argc--;
+ while (argc > 0 && argv[0][0]=='-')
+ {
+ if (strncmp(argv[0],"-pid=",5) == 0 && argv[0][5])
+ {
+ pidarg=&argv[0][5];
+ lockfilename=malloc(strlen(pidarg)+sizeof(".lock"));
+ if (!lockfilename)
+ {
+ perror("malloc");
+ exit(1);
+ }
+ strcat(strcpy(lockfilename, pidarg), ".lock");
+ }
+ else
+ if (strncmp(argv[0],"-name=",6) == 0 && argv[0][6])
+ namearg=&argv[0][6];
+ else if (strncmp(argv[0],"-user=",6) == 0)
+ userarg=argv[0]+6;
+ else if (strncmp(argv[0],"-group=",7) == 0)
+ grouparg=argv[0]+7;
+ else if (strcmp(argv[0], "-droproot") == 0)
+ droproot=1;
+ else
+ if (strncmp(argv[0],"-facility=",10) == 0)
+ {
+ struct lognames *p = facilitynames;
+
+ while (p->name && strcmp(p->name, &argv[0][10]))
+ p++;
+ if (p->name == 0)
+ {
+ fprintf(stderr, "Unknown facility name '%s'\n",
+ &argv[0][10]);
+ exit(1);
+ }
+ facility = p->value;
+ }
+ else
+ if (strcmp(argv[0],"-start") == 0)
+ daemon = 1;
+ else
+ if (strcmp(argv[0],"-stop") == 0)
+ daemon = 2;
+ else
+ if (strcmp(argv[0],"-restart") == 0)
+ daemon = 3;
+ else
+ if (strcmp(argv[0],"-respawn") == 0)
+ respawn = 1;
+ else
+ {
+ fprintf(stderr, "Unknown option '%s'\n", argv[0]);
+ exit(1);
+ }
+ argv++, argc--;
+ }
+
+ if (daemon && !pidarg)
+ {
+ fprintf(stderr, "-pid argument required\n");
+ exit(1);
+ }
+
+ if (!daemon && pidarg)
+ daemon = 1; /* -start implied */
+
+ if (!namearg && daemon != 2 && daemon != 3)
+ {
+ /* choose a default name based on the program we're running */
+ if (argc <= 0 || !argv[0] || !argv[0][0])
+ {
+ fprintf(stderr, "-name option required for standalone logger\n");
+ exit(1);
+ }
+ namearg = strrchr(argv[0],'/');
+ namearg = namearg ? namearg+1 : argv[0];
+ }
+
+ switch (daemon)
+ {
+ case 1: /* start */
+ if (argc <= 0 || !argv[0] || !argv[0][0])
+ {
+ fprintf(stderr, "-start must be followed by a command to execute\n");
+ exit(1);
+ }
+ lockfd=ll_daemon_start(lockfilename);
+ if (lockfd < 0)
+ {
+ perror("ll_daemon_start");
+ exit(1);
+ }
+ startchild(argv, droproot ? userarg:NULL,
+ droproot ? grouparg:NULL);
+ ll_daemon_started(pidarg, lockfd);
+ break;
+ case 2: /* stop */
+ exit(ll_daemon_stop(lockfilename, pidarg));
+ case 3: /* restart */
+ exit(ll_daemon_restart(lockfilename, pidarg));
+ default: /* run in foreground, with or without a child process */
+
+ if (argc > 0)
+ startchild(argv, droproot ? userarg:NULL,
+ droproot ? grouparg:NULL);
+ }
+
+ setuidgid(userarg, grouparg);
+
+ while (1)
+ {
+ int waitstat;
+ pid_t p2;
+ FILE *f = fdopen(0, "r");
+
+ do_logger(namearg, facility, f);
+ fclose(f);
+ if (child_pid < 0) break;
+ while ((p2=wait(&waitstat)) != child_pid &&
+ (p2 != -1 || errno != ECHILD))
+ ;
+ if (hup_restart)
+ hup_restart = 0;
+ else if (respawn)
+ sleep (5);
+ else
+ break;
+ startchild(argv, NULL, NULL);
+ }
+ exit(0);
+}
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