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/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "hostpid.h"
#include <unistd.h>
#include <netdb.h>
#define HOSTNAME_DISALLOWED_CHARS "/\r\n\t"
const char *my_hostname = NULL;
const char *my_pid = NULL;
static char *my_hostname_dup = NULL;
static char *my_domain = NULL;
void hostpid_init(void)
{
static char pid[MAX_INT_STRLEN];
char hostname[256];
const char *value;
/* allow calling hostpid_init() multiple times to reset hostname */
i_free_and_null(my_hostname_dup);
i_free_and_null(my_domain);
value = getenv(MY_HOSTNAME_ENV);
if (value == NULL) {
if (gethostname(hostname, sizeof(hostname)-1) < 0)
i_fatal("gethostname() failed: %m");
hostname[sizeof(hostname)-1] = '\0';
value = hostname;
}
if (value[0] == '\0' ||
strcspn(value, HOSTNAME_DISALLOWED_CHARS) != strlen(value))
i_fatal("Invalid system hostname: '%s'", value);
my_hostname_dup = i_strdup(value);
my_hostname = my_hostname_dup;
i_snprintf(pid, sizeof(pid), "%lld", (long long)getpid());
my_pid = pid;
}
void hostpid_deinit(void)
{
i_free(my_hostname_dup);
i_free(my_domain);
}
const char *my_hostdomain(void)
{
struct hostent *hent;
const char *name;
if (my_domain == NULL) {
name = getenv(MY_HOSTDOMAIN_ENV);
if (name == NULL) {
hent = gethostbyname(my_hostname);
name = hent != NULL ? hent->h_name : NULL;
if (name == NULL) {
/* failed, use just the hostname */
name = my_hostname;
}
}
my_domain = i_strdup(name);
}
return my_domain;
}
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