gethostbyaddr not working on Tru64 (including WORKING bugfix)

Hi, we recently noticed a bug in the latest PHP4 release running on Tru64 UNIX. The gethostbyaddr function fails resolving any host in any case. We know that this is a bug as our environment is perfectly working and other apps can succesfully resolve any resolvable hosts. This is not only a bug report but also includes the solution. In ext/standard/dns.c, gethostbyaddr is called that way: hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET); This fails in any case as we found out by isolating this code into a small test application. At the bottom of this mail I attached the man pages on the Tru64 glibc gethostbyaddr function, hope this helps! We've rewritten that line and the following WORKS: hp = gethostbyaddr((char *) &addr, sizeof(struct in_addr), AF_INET); Why? Well, it is because of the 2nd parameter. sizeof(addr) returns 8 which is wrong, the corrent return value would have to be 4 which is correctly returned when using sizeof(struct in_addr). hope you'll include this fix in the next release of PHP4. Thanks in advance! cheers, Horst G Reiterer -- gethostbyaddr(3) gethostbyaddr(3) NAME gethostbyaddr, gethostbyaddr_r - Gets a network host entry by address LIBRARY Standard C Library (libc.so, libc.a) SYNOPSIS #include <netdb.h> struct hostent *gethostbyaddr( const void *addr, size_t len, [Tru64 UNIX] The following obsolete routine is supported in order to main- tain backward compatibility with previous versions of the operating system. You should not use it in new designs. int *gethostbyaddr_r( const char *addr, int len, int type, struct hostent *hptr, struct hostent_data *hdptr); [Tru64 UNIX] The following definition of the gethostbyaddr() routine does not conform to current standards and is supported only for backward compa- tibility (see standards(5)): struct hostent *gethostbyaddr( const char *addr, int len, int type) ; STANDARDS Interfaces documented on this reference page conform to industry standards as follows: gethostbyaddr(): XNS4.0 Refer to the standards(5) reference page for more information about indus- try standards and associated tags. PARAMETERS addr Specifies an Internet address in network order. len Specifies the number of bytes in an Internet address. type Specifies the Internet domain address format (AF_INET). hdptr [Tru64 UNIX] Is data for the host database. The netdb.h header file defines the hostent_data structure. hptr [Tru64 UNIX] Points to the hostent structure. The netdb.h header file defines the hostent structure. The gethostbyaddr() routine returns a pointer to a structure of type hos- tent. Its members specify data obtained from either the local /etc/hosts file or one of the files distributed by DNS/BIND or NIS. To determine which file or files to search, and in which order, the system uses the switches in the /etc/svc.conf file. The netdb.h header file defines the hostent structure. The gethostbyaddr() routine searches the network host database sequentially until a match with the addr and type parameters occurs. The len parameter must specify the number of bytes in an Internet address. The addr parame- ter must specify the address in network order. The type parameter must be the constant AF_INET, which specifies the Internet Protocol Version 4 (IPv4) address format. When EOF (End-of-File) is reached without a match, an error value is returned. If using DNS/BIND, the information is obtained from a name server specified in the /etc/resolv.conf file. When the name server is not running, the gethostbyaddr() routine searches the local hosts name file. Use the endhostent() routine to close the /etc/hosts file. The gethostbyaddr() routine returns a pointer to thread-specific data. Subsequent calls to this or a related routine from the same thread overwrite this data. [Tru64 UNIX] The gethostbyaddr_r() routine is an obsolete reentrant ver- sion of the gethostbyaddr() routine. It is supported in order to maintain backward compatibility with previous versions of the operating system and should not be used in new designs. Note that you must zero-fill the hdptr structure before its first access by the gethostbyaddr_r() routine. RETURN VALUES Upon successful completion, the gethostbyaddr() routine returns a pointer to a hostent structure. If it reaches the end of the network hostname database, it returns a null pointer. [Tru64 UNIX] Upon successful completion, the gethostbyaddr_r() routine stores the hostent structure in hptr, and returns a value of 0 (zero). Upon failure, it returns a value of -1. ERRORS If the gethostbyaddr() or gethostbyaddr_r() routine call fails, h_errno is set to one of the following values: [HOST_NOT_FOUND] Host is unknown. [NO_DATA] The server recognized the request and the name, but no address is available for the name. Another type of name server request may be successful. [NO_RECOVERY] An unexpected server failure occurred. This is a nonrecoverable error. [TRY_AGAIN] A transient error occurred, for example, the server did not respond. A retry at some later time may be successful. [Tru64 UNIX] If any of the following conditions occurs, the gethostbyaddr_r() routine sets errno to the corresponding value: [EINVAL] The name, hptr, or hdptr is invalid, or type is not AF_INET. [EINVAL] The name, hptr, or hdptr is invalid, or type is not AF_INET. FILES /etc/hosts This file is the Internet network hostname database. Each record in the file occupies a single line and has three fields consist- ing of the host address, official hostname, and aliases. /etc/resolv.conf The resolver configuration file. /etc/svc.conf The database service selection configuration file. RELATED INFORMATION routines: endhostent(3), gethostbyname(3), sethostent(3). Files: hosts(4), resolv.conf(4), svc.conf(4). Networks: bind_intro(7), nis_intro(7). Standards: standards(5)