Port strlist to use async DNS.
[apps/pfixtools.git] / common / common.h
1 /******************************************************************************/
2 /*          pfixtools: a collection of postfix related tools                  */
3 /*          ~~~~~~~~~                                                         */
4 /*  ________________________________________________________________________  */
5 /*                                                                            */
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8 /*  are met:                                                                  */
9 /*                                                                            */
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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     */
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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 #define __tostr(x)  #x
61 #define STR(x)      __tostr(x)
62
63 typedef int  (*initcall_t)(void);
64 typedef void (*exitcall_t)(void);
65
66 #define __init __attribute__((__used__,__section__(".mad.init")))
67 #define __exit __attribute__((__used__,__section__(".mad.exit")))
68
69 #define module_init(fn)  static __init initcall_t __init_##fn = fn;
70 #define module_exit(fn)  static __exit exitcall_t __exit_##fn = fn;
71
72 #define likely(expr)    __builtin_expect((expr) != 0, 1)
73 #define unlikely(expr)  __builtin_expect((expr) != 0, 0)
74
75 #define __level_name(L)                                            \
76   ( (L) == LOG_DEBUG   ? "debug "                                  \
77   : (L) == LOG_NOTICE  ? "notice"                                  \
78   : (L) == LOG_INFO    ? "info  "                                  \
79   : (L) == LOG_WARNING ? "warn  "                                  \
80   : (L) == LOG_ERR     ? "error "                                  \
81   : (L) == LOG_CRIT    ? "crit  "                                  \
82   : (L) == LOG_ALERT   ? "alert "                                  \
83   : "???   " )
84
85 #define __log(Level, Fmt, ...)                                    \
86     if (log_level >= Level) {                                     \
87         if (log_syslog) {                                         \
88             syslog(Level, Fmt, ##__VA_ARGS__);                    \
89         } else {                                                  \
90             fprintf(stderr, "[%s] " Fmt "\n",                     \
91                     __level_name(Level), ##__VA_ARGS__);          \
92         }                                                         \
93     }
94
95 #define debug(Fmt, ...)  __log(LOG_DEBUG,   Fmt, ##__VA_ARGS__)
96 #define notice(Fmt, ...) __log(LOG_NOTICE,  Fmt, ##__VA_ARGS__)
97 #define info(Fmt, ...)   __log(LOG_INFO,    Fmt, ##__VA_ARGS__)
98 #define warn(Fmt, ...)   __log(LOG_WARNING, Fmt, ##__VA_ARGS__)
99 #define err(Fmt, ...)    __log(LOG_ERR,     Fmt, ##__VA_ARGS__)
100 #define crit(Fmt, ...)   __log(LOG_CRIT,    Fmt, ##__VA_ARGS__)
101 #define alert(Fmt, ...)  __log(LOG_ALERT,   Fmt, ##__VA_ARGS__)
102 #define emerg(Fmt, ...)  __log(LOG_ALERT,   Fmt, ##__VA_ARGS__)
103
104 #define UNIXERR(fun)     err("%s:%d:%s %s: %m",                      \
105                              __FILE__, __LINE__, __func__, fun)
106
107 extern sig_atomic_t sigint;
108 extern sig_atomic_t sighup;
109 extern int          log_level;
110 extern bool         log_syslog;
111
112 void common_sighandler(int sig);
113
114 int setnonblock(int sock);
115 int tcp_bind(const struct sockaddr *addr, socklen_t len);
116 int tcp_listen(const struct sockaddr *addr, socklen_t len);
117 int tcp_listen_nonblock(const struct sockaddr *addr, socklen_t len);
118 int accept_nonblock(int fd);
119 int xwrite(int fd, const char *s, size_t l);
120
121 int daemon_detach(void);
122 int drop_privileges(const char *user, const char *group);
123
124 int pidfile_open(const char *name);
125 int pidfile_refresh(void);
126
127 int common_setup(const char* pidfile, bool unsafe, const char* runas_user,
128                  const char* runas_group, bool daemonize);
129
130 static inline void common_startup(void)
131 {
132     signal(SIGPIPE, SIG_IGN);
133     signal(SIGINT,  &common_sighandler);
134     signal(SIGTERM, &common_sighandler);
135     signal(SIGHUP,  &common_sighandler);
136     signal(SIGSEGV, &common_sighandler);
137 }
138
139
140 #define DECLARE_MAIN                                              \
141     static int main_initialize(void)                              \
142     {                                                             \
143         log_syslog = true;                                        \
144         openlog(DAEMON_NAME, LOG_PID, LOG_MAIL);                  \
145         common_startup();                                         \
146         return 0;                                                 \
147     }                                                             \
148                                                                   \
149     static void main_shutdown(void)                               \
150     {                                                             \
151         closelog();                                               \
152     }                                                             \
153                                                                   \
154     module_init(main_initialize);                                 \
155     module_exit(main_shutdown);
156
157 #endif