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Re: The patch of glibc which allows the user to override the pfinet serv
Re: The patch of glibc which allows the user to override the pfinet server
Wed, 09 Jul 2008 14:02:18 +0200
Thunderbird 184.108.40.206 (X11/20080421)
Neal H. Walfield wrote:
If more network protocols are implemented, we have to provide more
environment variables for the servers.
Or you use an environment variable that is based on a stem and the
protocol number. So instead of SOCK_INET_SERV_PATH,
SOCK_SERV_%d_PATH. Perhaps it is best to support both. The number of
protocol is not increasing at a terribly fast rate.
The new version of the patch is below.
I wonder if I can use __snprintf(). The code in the original glibc
doesn't use it.
Needed for glibc-2_7-branch
2008-06-30 Zheng Da <address@hidden>
* hurd/hurdsocks.c: _hurd_socket_server() searches in environment
for the socket server insteading of using the default one.
--- glibc-2.7-old/hurd/hurdsock.c 2008-06-21 01:38:30.300000000 +0200
+++ glibc-2.7/hurd/hurdsock.c 2008-07-02 08:33:49.570000000 +0200
@@ -76,16 +76,30 @@
if (domain > max_domain || servers[domain] == MACH_PORT_NULL)
- char name[sizeof (_SERVERS_SOCKET) + 100];
- char *np = &name[sizeof (name)];
- *--np = '\0';
- np = _itoa (domain, np, 10, 0);
- *--np = '/';
- np -= sizeof (_SERVERS_SOCKET) - 1;
- memcpy (np, _SERVERS_SOCKET, sizeof (_SERVERS_SOCKET) - 1);
+ char sock_serv_env_name;
+ int len;
+ char *name = NULL;
+ char *np = NULL;
+ __snprintf (sock_serv_env_name, 30, "SOCK_SERV_%d_PATH", domain);
+ if ((np = getenv (sock_serv_env_name)) == NULL)
+ char *sock_serv_path = NULL;
+ sock_serv_path = getenv ("SOCK_SERV_PATH");
+ if (sock_serv_path == NULL)
+ sock_serv_path = _SERVERS_SOCKET;
+ len = strlen (sock_serv_path);
+ name = (char *)malloc (len + 100);
+ if (name == NULL)
+ __libc_fatal ("hurd: Can't allocate the socket server
+ np = name;
+ __snprintf (np, len + 100, "%s/%d", sock_serv_path, domain);
server = __file_name_lookup (np, 0, 0);
if (domain <= max_domain)
- servers[domain] = server;
+ servers[domain] = server;
+ if (name)
+ free (name);
server = servers[domain];
I also write a SHELL script "runwithpfinet" to set the environment
variables and run the command provided by the user.
The environment variables used by glibc are SOCK_SERV_%d for overriding
the specific socket server and SOCK_SERV for all default servers.
if [ $# -lt 1 ]; then
echo "run command"
The first argument of the script specifies the pfinet server, and the
rest of arguments are command.
It works in most of cases. but it doesn't work with "ping" when the user
execute "runwithpfinet 1 ping www.google.com". "ping" still uses the
default pfinet server.
The main reason, I think, is that "ping" has a sticky bit. When the user
runs it, it gets the privilege of root, and meanwhile, the environment
variables are changed.
Does anyone has any ideas to fix the problem?