Home | History | Annotate | Line # | Download | only in master 
      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 
     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 
     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