diff options
Diffstat (limited to 'checkalias.c')
| -rw-r--r-- | checkalias.c | 97 |
1 files changed, 53 insertions, 44 deletions
diff --git a/checkalias.c b/checkalias.c index 413b4047..1eca63da 100644 --- a/checkalias.c +++ b/checkalias.c @@ -1,3 +1,10 @@ +/* + * checkalias.c -- check to see if the IP addresses of two hosts are the same + * + * Copyright 1997 by Eric S. Raymond + * For license terms, see the file COPYING in this directory. + */ + #include <stdio.h> #include <string.h> #include <sys/types.h> @@ -6,7 +13,6 @@ #include <arpa/inet.h> #include <netdb.h> #include "fetchmail.h" - int is_ip_alias(const char *name1,const char *name2) /* Given two hostnames as arguments, returns TRUE if they @@ -15,59 +21,62 @@ int is_ip_alias(const char *name1,const char *name2) * No check is done on errors returned by gethostbyname, * the calling function does them. */ - { - - typedef unsigned char address_t[sizeof (struct in_addr)]; - typedef struct _address_e { struct _address_e *next; - address_t address; - } address_e; +{ + typedef unsigned char address_t[sizeof (struct in_addr)]; + typedef struct _address_e + { + struct _address_e *next; + address_t address; + } + address_e; + address_e *host_a_addr, *host_b_addr,*dummy_addr; - address_e *host_a_addr, *host_b_addr,*dummy_addr; - - int i; - - struct hostent *hp; - - char **p; + int i; + struct hostent *hp; + char **p; - hp = gethostbyname(name1); + hp = gethostbyname(name1); - dummy_addr = (address_e *)NULL; - - for (i=0,p = hp->h_addr_list; *p != 0; i++,p++) { - struct in_addr in; - (void) memcpy(&in.s_addr, *p, sizeof (in.s_addr)); - host_a_addr = (address_e *)xmalloc(sizeof( address_e)); - memset (host_a_addr,0, sizeof (address_e)); - host_a_addr->next = dummy_addr; - (void) memcpy(&host_a_addr->address, *p, sizeof (in.s_addr)); - dummy_addr = host_a_addr; - } + dummy_addr = (address_e *)NULL; + for (i=0,p = hp->h_addr_list; *p != 0; i++,p++) + { + struct in_addr in; + (void) memcpy(&in.s_addr, *p, sizeof (in.s_addr)); + host_a_addr = (address_e *)xmalloc(sizeof( address_e)); + memset (host_a_addr,0, sizeof (address_e)); + host_a_addr->next = dummy_addr; + (void) memcpy(&host_a_addr->address, *p, sizeof (in.s_addr)); + dummy_addr = host_a_addr; + } - hp = gethostbyname(name2); - dummy_addr = (address_e *)NULL; + hp = gethostbyname(name2); - for (i=0,p = hp->h_addr_list; *p != 0; i++,p++) { - struct in_addr in; - (void) memcpy(&in.s_addr, *p, sizeof (in.s_addr)); - host_b_addr = (address_e *)xmalloc(sizeof( address_e)); - memset (host_b_addr,0, sizeof (address_e)); - host_b_addr->next = dummy_addr; - (void) memcpy(&host_b_addr->address, *p, sizeof (in.s_addr)); - dummy_addr = host_b_addr; - } + dummy_addr = (address_e *)NULL; - while (host_a_addr) { - while (host_b_addr) { + for (i=0,p = hp->h_addr_list; *p != 0; i++,p++) + { + struct in_addr in; + (void) memcpy(&in.s_addr, *p, sizeof (in.s_addr)); + host_b_addr = (address_e *)xmalloc(sizeof( address_e)); + memset (host_b_addr,0, sizeof (address_e)); + host_b_addr->next = dummy_addr; + (void) memcpy(&host_b_addr->address, *p, sizeof (in.s_addr)); + dummy_addr = host_b_addr; + } - if (!memcmp(host_b_addr->address,host_a_addr->address, sizeof (address_t))) return (TRUE); + while (host_a_addr) + { + while (host_b_addr) + { + if (!memcmp(host_b_addr->address,host_a_addr->address, sizeof (address_t))) + return (TRUE); - host_b_addr = host_b_addr->next; - } - host_a_addr = host_a_addr->next; + host_b_addr = host_b_addr->next; } -return (FALSE); + host_a_addr = host_a_addr->next; + } + return (FALSE); } |