common/common.h

   1 /******************************************************************************/
   2 /*          pfixtools: a collection of postfix related tools                  */
   3 /*          ~~~~~~~~~                                                         */
   4 /*  ________________________________________________________________________  */
   5 /*                                                                            */
   6 /*  Redistribution and use in source and binary forms, with or without        */
   7 /*  modification, are permitted provided that the following conditions        */
   8 /*  are met:                                                                  */
   9 /*                                                                            */
  10 /*  1. Redistributions of source code must retain the above copyright         */
  11 /*     notice, this list of conditions and the following disclaimer.          */
  12 /*  2. Redistributions in binary form must reproduce the above copyright      */
  13 /*     notice, this list of conditions and the following disclaimer in the    */
  14 /*     documentation and/or other materials provided with the distribution.   */
  15 /*  3. The names of its contributors may not be used to endorse or promote    */
  16 /*     products derived from this software without specific prior written     */
  17 /*     permission.                                                            */
  18 /*                                                                            */
  19 /*  THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND   */
  20 /*  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE     */
  21 /*  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR        */
  22 /*  PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS    */
  23 /*  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR    */
  24 /*  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF      */
  25 /*  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS  */
  26 /*  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN   */
  27 /*  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)   */
  28 /*  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF    */
  29 /*  THE POSSIBILITY OF SUCH DAMAGE.                                           */
  30 /******************************************************************************/
  31
  32 /*
  33  * Copyright © 2007 Pierre Habouzit
  34  * Copyright © 2008 Florent Bruneau
  35  */
  36
  37 #ifndef PFIXTOOLS_COMMON_H
  38 #define PFIXTOOLS_COMMON_H
  39
  40 #include <errno.h>
  41 #include <fcntl.h>
  42 #include <limits.h>
  43 #include <netinet/in.h>
  44 #include <signal.h>
  45 #include <stdbool.h>
  46 #include <stdbool.h>
  47 #include <stddef.h>
  48 #include <stdint.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <syslog.h>
  52 #include <sys/socket.h>
  53 #include <sys/stat.h>
  54 #include <sys/types.h>
  55 #include <time.h>
  56 #include <unistd.h>
  57
  58 #include "mem.h"
  59
  60
  61 #define __tostr(x)  #x
  62 #define STR(x)      __tostr(x)
  63
  64 typedef int  (*initcall_t)(void);
  65 typedef void (*exitcall_t)(void);
  66
  67 #define __init __attribute__((__used__,__section__(".mad.init")))
  68 #define __exit __attribute__((__used__,__section__(".mad.exit")))
  69
  70 #define module_init(fn)  static __init initcall_t __init_##fn = fn;
  71 #define module_exit(fn)  static __exit exitcall_t __exit_##fn = fn;
  72
  73 #define __log(Level, Fmt, ...)                                    \
  74     if (log_level >= Level) {                                     \
  75         if (log_syslog) {                                         \
  76             syslog(Level, Fmt, ##__VA_ARGS__);                    \
  77         } else {                                                  \
  78             fprintf(stderr, "[%d] " Fmt "\n",                     \
  79                     Level, ##__VA_ARGS__);                        \
  80         }                                                         \
  81     }
  82
  83 #define debug(Fmt, ...)  __log(LOG_DEBUG,   Fmt, ##__VA_ARGS__)
  84 #define notice(Fmt, ...) __log(LOG_NOTICE,  Fmt, ##__VA_ARGS__)
  85 #define info(Fmt, ...)   __log(LOG_INFO,    Fmt, ##__VA_ARGS__)
  86 #define warn(Fmt, ...)   __log(LOG_WARNING, Fmt, ##__VA_ARGS__)
  87 #define err(Fmt, ...)    __log(LOG_ERR,     Fmt, ##__VA_ARGS__)
  88 #define crit(Fmt, ...)   __log(LOG_CRIT,    Fmt, ##__VA_ARGS__)
  89 #define alert(Fmt, ...)  __log(LOG_ALERT,   Fmt, ##__VA_ARGS__)
  90 #define emerg(Fmt, ...)  __log(LOG_ALERT,   Fmt, ##__VA_ARGS__)
  91
  92 #define UNIXERR(fun)     err("%s:%d:%s %s: %m",                      \
  93                              __FILE__, __LINE__, __func__, fun)
  94
  95 extern sig_atomic_t sigint;
  96 extern sig_atomic_t sighup;
  97 extern int          log_level;
  98 extern bool         log_syslog;
  99
 100 void common_sighandler(int sig);
 101
 102 int tcp_bind(const struct sockaddr *addr, socklen_t len);
 103 int tcp_listen(const struct sockaddr *addr, socklen_t len);
 104 int tcp_listen_nonblock(const struct sockaddr *addr, socklen_t len);
 105 int accept_nonblock(int fd);
 106 int xwrite(int fd, const char *s, size_t l);
 107
 108 int daemon_detach(void);
 109 int drop_privileges(const char *user, const char *group);
 110
 111 int pidfile_open(const char *name);
 112 int pidfile_refresh(void);
 113
 114 int common_setup(const char* pidfile, bool unsafe, const char* runas_user,
 115                  const char* runas_group, bool daemonize);
 116
 117 static inline void common_startup(void)
 118 {
 119     signal(SIGPIPE, SIG_IGN);
 120     signal(SIGINT,  &common_sighandler);
 121     signal(SIGTERM, &common_sighandler);
 122     signal(SIGHUP,  &common_sighandler);
 123     signal(SIGSEGV, &common_sighandler);
 124     info("starting");
 125 }
 126
 127
 128 #define DECLARE_MAIN                                              \
 129     static int main_initialize(void)                              \
 130     {                                                             \
 131         log_syslog = true;                                        \
 132         openlog(DAEMON_NAME, LOG_PID, LOG_MAIL);                  \
 133         common_startup();                                         \
 134         return 0;                                                 \
 135     }                                                             \
 136                                                                   \
 137     static void main_shutdown(void)                               \
 138     {                                                             \
 139         closelog();                                               \
 140     }                                                             \
 141                                                                   \
 142     module_init(main_initialize);                                 \
 143     module_exit(main_shutdown);
 144
 145 #endif