src/lib/hostpid.c

	hostpid.c revision ce9a7b1f31609bc30c998803248fa8aeb902d95f
/* Copyright (c) 2002-2012 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "hostpid.h"

#include <unistd.h>
#include <netdb.h>

const char *my_hostname = NULL;
const char *my_pid = NULL;

static char *my_domain = NULL;

void hostpid_init(void)
{
    static char hostname[256], pid[MAX_INT_STRLEN];

    if (gethostname(hostname, sizeof(hostname)-1) == -1) {
        if (i_strocpy(hostname, "unknown", sizeof(hostname)) < 0)
            i_unreached();
    }
    hostname[sizeof(hostname)-1] = '\0';
    my_hostname = hostname;

    if (strchr(hostname, '/') != NULL)
        i_fatal("Invalid system hostname: %s", hostname);

    /* allow calling hostpid_init() multiple times to reset hostname */
    i_free_and_null(my_domain);

    i_snprintf(pid, sizeof(pid), "%lld", (long long)getpid());
    my_pid = pid;
}

const char *my_hostdomain(void)
{
    struct hostent *hent;
    const char *name;

    if (my_domain == 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;
}