1 /* $NetBSD: master_conf.c,v 1.2 2020/03/18 19:05:16 christos Exp $ */
2
3 /*++
4 /* NAME
5 /* master_conf 3
6 /* SUMMARY
7 /* Postfix master - master.cf file processing
8 /* SYNOPSIS
9 /* #include "master.h"
10 /*
11 /* void master_config(serv)
12 /* MASTER_SERV *serv;
13 /*
14 /* void master_refresh(serv)
15 /* MASTER_SERV *serv;
16 /* DESCRIPTION
17 /* Use master_config() to read the master.cf configuration file
18 /* during program initialization.
19 /*
20 /* Use master_refresh() to re-read the master.cf configuration file
21 /* when the process is already running.
22 /* DIAGNOSTICS
23 /* BUGS
24 /* SEE ALSO
25 /* master_ent(3), configuration file programmatic interface.
26 /* LICENSE
27 /* .ad
28 /* .fi
29 /* The Secure Mailer license must be distributed with this software.
30 /* AUTHOR(S)
31 /* Wietse Venema
32 /* IBM T.J. Watson Research
33 /* P.O. Box 704
34 /* Yorktown Heights, NY 10598, USA
35 /*
36 /* Wietse Venema
37 /* Google, Inc.
38 /* 111 8th Avenue
39 /* New York, NY 10011, USA
40 /*--*/
41
42 /* System libraries. */
43
44 #include <sys_defs.h>
45 #include <unistd.h>
46 #include <string.h>
47
48 /* Utility library. */
49
50 #include <msg.h>
51 #include <argv.h>
52
53 /* Application-specific. */
54
55 #include "master.h"
56
57 /* master_refresh - re-read configuration table */
58
master_refresh(void)59 void master_refresh(void)
60 {
61 MASTER_SERV *serv;
62 MASTER_SERV **servp;
63
64 /*
65 * Mark all existing services.
66 */
67 for (serv = master_head; serv != 0; serv = serv->next)
68 serv->flags |= MASTER_FLAG_MARK;
69
70 /*
71 * Read the master.cf configuration file. The master_conf() routine
72 * unmarks services upon update. New services are born with the mark bit
73 * off. After this, anything with the mark bit on should be removed.
74 */
75 master_config();
76
77 /*
78 * Delete all services that are still marked - they disappeared from the
79 * configuration file and are therefore no longer needed.
80 */
81 for (servp = &master_head; (serv = *servp) != 0; /* void */ ) {
82 if ((serv->flags & MASTER_FLAG_MARK) != 0) {
83 *servp = serv->next;
84 master_stop_service(serv);
85 free_master_ent(serv);
86 } else {
87 servp = &serv->next;
88 }
89 }
90 }
91
92 /* master_config - read config file */
93
master_config(void)94 void master_config(void)
95 {
96 MASTER_SERV *entry;
97 MASTER_SERV *serv;
98
99 #define STR_DIFF strcmp
100 #define STR_SAME !strcmp
101 #define SWAP(type,a,b) { type temp = a; a = b; b = temp; }
102
103 /*
104 * A service is identified by its endpoint name AND by its transport
105 * type, not just by its name alone. The name is unique within its
106 * transport type. XXX Service privacy is encoded in the service name.
107 */
108 set_master_ent();
109 while ((entry = get_master_ent()) != 0) {
110 if (msg_verbose)
111 print_master_ent(entry);
112 for (serv = master_head; serv != 0; serv = serv->next)
113 if (STR_SAME(serv->name, entry->name) && serv->type == entry->type)
114 break;
115
116 /*
117 * Add a new service entry. We do not really care in what order the
118 * service entries are kept in memory.
119 */
120 if (serv == 0) {
121 entry->next = master_head;
122 master_head = entry;
123 master_start_service(entry);
124 }
125
126 /*
127 * Update an existing service entry. Make the current generation of
128 * child processes commit suicide whenever it is convenient. The next
129 * generation of child processes will run with the new configuration
130 * settings.
131 */
132 else {
133 if ((serv->flags & MASTER_FLAG_MARK) == 0)
134 msg_warn("duplicate master.cf entry for service \"%s\" (%s) "
135 "-- using the last entry", serv->ext_name, serv->name);
136 else
137 serv->flags &= ~MASTER_FLAG_MARK;
138 if (entry->flags & MASTER_FLAG_CONDWAKE)
139 serv->flags |= MASTER_FLAG_CONDWAKE;
140 else
141 serv->flags &= ~MASTER_FLAG_CONDWAKE;
142 serv->wakeup_time = entry->wakeup_time;
143 serv->max_proc = entry->max_proc;
144 serv->throttle_delay = entry->throttle_delay;
145 SWAP(char *, serv->ext_name, entry->ext_name);
146 SWAP(char *, serv->path, entry->path);
147 SWAP(ARGV *, serv->args, entry->args);
148 SWAP(char *, serv->stress_param_val, entry->stress_param_val);
149 master_restart_service(serv, DO_CONF_RELOAD);
150 free_master_ent(entry);
151 }
152 }
153 end_master_ent();
154 }
155