diff options
| -rw-r--r-- | libc/inet/hostid.c | 67 |
1 files changed, 26 insertions, 41 deletions
diff --git a/libc/inet/hostid.c b/libc/inet/hostid.c index 99346d7f8..ac4c56c35 100644 --- a/libc/inet/hostid.c +++ b/libc/inet/hostid.c @@ -1,3 +1,4 @@ +/* vi: set sw=4 ts=4: */ /* * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org> * @@ -6,15 +7,13 @@ #define __FORCE_GLIBC #include <features.h> -#include <stdio.h> -#include <string.h> #include <errno.h> -#include <sys/param.h> -#include <netinet/in.h> -#include <netdb.h> -#include <fcntl.h> #include <unistd.h> - +#include <sys/types.h> +#include <fcntl.h> +#include <stdlib.h> +#include <string.h> +#include <netdb.h> #define HOSTID "/etc/hostid" @@ -35,23 +34,23 @@ int sethostid(long int new_id) } #endif +#define _addr(a) (((struct sockaddr_in*)a->ai_addr)->sin_addr.s_addr) long int gethostid(void) { - char host[MAXHOSTNAMELEN + 1]; - int fd, id; + char host[HOST_NAME_MAX + 1]; + int fd, id = 0; /* If hostid was already set then we can return that value. * It is not an error if we cannot read this file. It is not even an * error if we cannot read all the bytes, we just carry on trying... */ fd = open(HOSTID, O_RDONLY); - if (fd >= 0 && read(fd, &id, sizeof(id))) - { - close (fd); - return id; + if (fd >= 0) { + int i = read(fd, &id, sizeof(id)); + close(fd); + if (i > 0) + return id; } - if (fd >= 0) close (fd); - /* Try some methods of returning a unique 32 bit id. Clearly IP * numbers, if on the internet, will have a unique address. If they * are not on the internet then we can return 0 which means they should @@ -63,32 +62,18 @@ long int gethostid(void) * setting one anyway. * Mitch */ - if (gethostname(host, MAXHOSTNAMELEN) >= 0 && *host) { - struct hostent *hp; - struct in_addr in; - struct hostent ghbn_h; - char ghbn_buf[sizeof(struct in_addr) + - sizeof(struct in_addr *)*2 + - sizeof(char *)*((2 + 5/*MAX_ALIASES*/ + - 1)/*ALIAS_DIM*/) + - 256/*namebuffer*/ + 32/* margin */]; - int ghbn_errno; - - /* replace gethostbyname() with gethostbyname_r() - ron@zing.net */ - /*if ((hp = gethostbyname(host)) == (struct hostent *)NULL)*/ - gethostbyname_r(host, &ghbn_h, ghbn_buf, sizeof(ghbn_buf), &hp, &ghbn_errno); - - if (hp == NULL) { - /* This is not a error if we get here, as all it means is that - * this host is not on a network and/or they have not - * configured their network properly. So we return the unset - * hostid which should be 0, meaning that they should set it !! - */ - return 0; + if (gethostname(host, HOST_NAME_MAX) >= 0 && *host) { + struct addrinfo hints, *results, *addr; + memset(&hints, 0, sizeof(struct addrinfo)); + if (!getaddrinfo(host, NULL, &hints, &results)) { + for (addr = results; addr; addr = results->ai_next) { + /* Just so it doesn't look exactly like the + IP addr */ + id = _addr(addr) << 16 | _addr(addr) >> 16; + break; + } + freeaddrinfo(results); } - memcpy(&in, hp->h_addr, hp->h_length); - /* Just so it doesn't look exactly like the IP addr */ - return (in.s_addr<<16 | in.s_addr>>16); } - return 0; + return id; } |