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config.c
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config.c
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/*
* Configuration routines
*/
#include <stdio.h>
#include <ctype.h>
#include <sysexits.h>
#include <syslog.h>
#include <com_err.h>
#include "config.h"
#include "xmalloc.h"
/* Many systems don't define EX_CONFIG */
#ifndef EX_CONFIG
#define EX_CONFIG 78
#endif
extern int errno;
#define CONFIG_FILENAME "/etc/imapd.conf"
struct configlist {
char *key;
char *value;
};
static struct configlist *configlist;
static int nconfiglist;
char *config_dir;
char *config_defpartition;
config_init(ident)
char *ident;
{
char buf[100];
char *p;
int umaskval = 0;
initialize_imap_error_table();
openlog(ident, LOG_PID, LOG_LOCAL4);
config_read();
/* Look up configdirectory config option */
config_dir = config_getstring("configdirectory", (char *)0);
if (!config_dir) {
fatal("configdirectory option not specified in configuration file",
EX_CONFIG);
}
/* Look up default partition */
config_defpartition = config_getstring("defaultpartition", "default");
for (p = config_defpartition; *p; p++) {
if (!isalnum(*p))
fatal("defaultpartition option contains non-alphanumeric character",
EX_CONFIG);
if (isupper(*p)) *p = tolower(*p);
}
p = config_partitiondir(config_defpartition);
if (!p) {
sprintf(buf, "partition-%s option not specified in configuration file",
config_defpartition);
fatal(buf, EX_CONFIG);
}
/* Look up umask */
p = config_getstring("umask", "077");
while (*p) {
if (*p >= '0' && *p <= '7') umaskval = umaskval*8 + *p - '0';
p++;
}
umask(umaskval);
return 0;
}
char *config_getstring(key, def)
char *key;
char *def;
{
int opt;
for (opt = 0; opt < nconfiglist; opt++) {
if (*key == configlist[opt].key[0] &&
!strcmp(key, configlist[opt].key))
return configlist[opt].value;
}
return def;
}
config_getint(key, def)
char *key;
int def;
{
char *val = config_getstring(key, (char *)0);
if (!val) return def;
if (!isdigit(*val) && (*val != '-' || !isdigit(val[1]))) return def;
return atoi(val);
}
config_getswitch(key, def)
char *key;
int def;
{
char *val = config_getstring(key, (char *)0);
if (!val) return def;
if (*val == '0' || *val == 'n' ||
(*val == 'o' && val[1] == 'f') || *val == 'f') {
return 0;
}
else if (*val == '1' || *val == 'y' ||
(*val == 'o' && val[1] == 'n') || *val == 't') {
return 1;
}
return def;
}
char *config_partitiondir(partition)
char *partition;
{
char buf[80];
if (strlen(partition) > 70) return 0;
strcpy(buf, "partition-");
strcat(buf, partition);
return config_getstring(buf, (char *)0);
}
#define CONFIGLISTGROWSIZE 10 /* 100 */
static config_read()
{
FILE *infile;
int lineno = 0;
int alloced = 0;
char buf[4096];
char *p, *key;
infile = fopen(CONFIG_FILENAME, "r");
if (!infile) {
sprintf(buf, "can't open configuration file %s: %s", CONFIG_FILENAME,
error_message(errno));
fatal(buf, EX_CONFIG);
}
while (fgets(buf, sizeof(buf), infile)) {
lineno++;
buf[strlen(buf)-1] = '\0';
for (p = buf; *p && isspace(*p); p++);
if (!*p || *p == '#') continue;
key = p;
while (*p && (isalnum(*p) || *p == '-')) {
if (isupper(*p)) *p = tolower(*p);
p++;
}
if (*p != ':') {
sprintf(buf,
"invalid option name on line %d of configuration file",
lineno);
fatal(buf, EX_CONFIG);
}
*p++ = '\0';
while (*p && isspace(*p)) p++;
if (!*p) {
sprintf(buf, "empty option value on line %d of configuration file",
lineno);
fatal(buf, EX_CONFIG);
}
if (nconfiglist == alloced) {
alloced += CONFIGLISTGROWSIZE;
configlist = (struct configlist *)
xrealloc((char *)configlist, alloced*sizeof(struct configlist));
}
configlist[nconfiglist].key = strsave(key);
configlist[nconfiglist].value = strsave(p);
nconfiglist++;
}
fclose(infile);
}

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