+++ /dev/null
-// $Id: syscall-legacy.hc 2076 2005-05-02 21:42:05Z ensc $ --*- c -*--
-
-// Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
-// based on syscall.cc by Jacques Gelinas
-//
-// This program is free software; you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation; either version 2, or (at your option)
-// any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program; if not, write to the Free Software
-// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
-/*
- This tells the system call number for new_s_context and set_ipv4root
- using /proc/self/status. This helps until the vserver project is
- included officially in the kernel (and has its own syscall).
-
- We rely on /proc/self/status to find the syscall number.
-
- If it is not there, we rely on adm/unistd.h.
-
- If this file does not have those system calls (not a patched kernel source)
- we rely on static values in this file.
-*/
-#include "safechroot-internal.hc"
-
-#include <string.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <asm/unistd.h>
-#include <stdbool.h>
-
-#include "syscall-wrap.h"
-
-// Here is the trick. We keep a copy of the define, then undef it
-// and then later, we try to locate the value reading /proc/self/status
-// If this fails, we have the old preserved copy.
-static int def_NR_set_ipv4root = 274;
-#undef __NR_set_ipv4root
-
-static int __NR_set_ipv4root_rev0;
-static int __NR_set_ipv4root_rev1;
-static int __NR_set_ipv4root_rev2;
-static int __NR_set_ipv4root_rev3;
-static int rev_ipv4root=0;
-
-#ifdef ENSC_SYSCALL_TRADITIONAL
-# if defined __dietlibc__
-extern long int syscall (long int __sysno, ...);
-# endif
-
-inline static int
-set_ipv4root_rev0(unsigned long ip)
-{
- return syscall(__NR_set_ipv4root_rev0, ip);
-}
-
-inline static int
-set_ipv4root_rev1(unsigned long ip, unsigned long bcast)
-{
- return syscall(__NR_set_ipv4root_rev1, ip, bcast);
-}
-
-inline static int
-set_ipv4root_rev2(unsigned long *ip, int nb, unsigned long bcast)
-{
- return syscall(__NR_set_ipv4root_rev2, ip, nb, bcast);
-}
-
-inline static int
-set_ipv4root_rev3(unsigned long *ip, int nb, unsigned long bcast, unsigned long * mask)
-{
- return syscall(__NR_set_ipv4root_rev3, ip, nb, bcast, mask);
-}
-
-#else // ENSC_SYSCALL_TRADITIONAL
-inline static _syscall1(int, set_ipv4root_rev0, unsigned long, ip)
-inline static _syscall2(int, set_ipv4root_rev1, unsigned long, ip, unsigned long, bcast)
-inline static _syscall3(int, set_ipv4root_rev2, unsigned long *, ip, int, nb, unsigned long, bcast)
-inline static _syscall4(int, set_ipv4root_rev3, unsigned long *, ip, int, nb, unsigned long, bcast, unsigned long *, mask)
-#endif // ENSC_SYSCALL_TRADITIONAL
-
-static int def_NR_new_s_context = 273;
-#undef __NR_new_s_context
-static int __NR_new_s_context_rev0;
-static int rev_s_context=0;
-
-
-#ifdef ENSC_SYSCALL_TRADITIONAL
-inline static xid_t
-new_s_context_rev0(int newctx, int remove_cap, int flags)
-{
- return syscall(__NR_new_s_context_rev0, newctx, remove_cap, flags);
-}
-#else // ENSC_SYSCALL_TRADITIONAL
-inline static _syscall3(int, new_s_context_rev0, int, newctx, int, remove_cap, int, flags)
-#endif // ENSC_SYSCALL_TRADITIONAL
-
-
-static bool is_init = false;
-
-#include "utils-legacy.h"
-
-#ifndef WRITE_MSG
-# define WRITE_MSG(FD,X) (void)(write(FD,X,sizeof(X)-1))
-#endif
-
-
-static bool
-getNumRevPair(char const *str, int *num, int *rev)
-{
- char const * blank_pos = strchr(str, ' ');
- char const * eol_pos = strchr(str, '\n');
-
- *num = atoi(str);
- if (*num==0) return false;
-
- if (blank_pos!=0 && eol_pos!=0 && blank_pos<eol_pos &&
- strncmp(blank_pos+1, "rev", 3)==0)
- *rev = atoi(blank_pos+4);
-
- return true;
-}
-
-#define SET_TAG_POS(TAG) \
- pos = strstr(buf, (TAG)); \
- if (pos) pos+=sizeof(TAG)-1
-
-static bool init_internal()
-{
- size_t bufsize = utilvserver_getProcEntryBufsize();
- char buf[bufsize];
- char const * pos = 0;
- pid_t pid = getpid();
- int num;
-
- errno = 0;
-
- pos=utilvserver_getProcEntry(pid, 0, buf, bufsize);
- if (pos==0 && errno==EAGAIN) return false;
-
- SET_TAG_POS("\n__NR_set_ipv4root: ");
- if ( pos!=0 && getNumRevPair(pos, &num, &rev_ipv4root) ) {
- __NR_set_ipv4root_rev0 =
- __NR_set_ipv4root_rev1 =
- __NR_set_ipv4root_rev2 =
- __NR_set_ipv4root_rev3 = num;
- }
-
- SET_TAG_POS("\n__NR_new_s_context: ");
- if ( pos!=0 && getNumRevPair(pos, &num, &rev_s_context) )
- __NR_new_s_context_rev0 = num;
-
- return true;
-}
-
-#undef SET_TAG_POS
-
-static void init()
-{
- if (!is_init){
- __NR_set_ipv4root_rev0 = def_NR_set_ipv4root;
- __NR_set_ipv4root_rev1 = def_NR_set_ipv4root;
- __NR_set_ipv4root_rev2 = def_NR_set_ipv4root;
- __NR_set_ipv4root_rev3 = def_NR_set_ipv4root;
- __NR_new_s_context_rev0 = def_NR_new_s_context;
-
- while (!init_internal() && errno==EAGAIN) {}
-
- is_init = true;
- }
-}
-
-void vc_init_legacy()
-{
- init();
-}
-
-void vc_init_internal_legacy(int ctx_rev, int ctx_number,
- int ipv4_rev, int ipv4_number)
-{
- rev_s_context = ctx_rev;
- __NR_new_s_context_rev0 = ctx_number;
-
- rev_ipv4root = ipv4_rev;
- __NR_set_ipv4root_rev0 = ipv4_number;
- __NR_set_ipv4root_rev1 = ipv4_number;
- __NR_set_ipv4root_rev2 = ipv4_number;
- __NR_set_ipv4root_rev3 = ipv4_number;
-
- is_init = true;
-}
-
-static ALWAYSINLINE xid_t
-vc_new_s_context_legacy(int ctx, int remove_cap, int flags)
-{
- xid_t ret = -1;
- init();
- if (rev_s_context == 0){
- return new_s_context_rev0(ctx, remove_cap, flags);
- }else{
- errno = -ENOSYS;
- ret = VC_NOCTX;
- }
- return ret;
-}
-
-static ALWAYSINLINE int
-vc_set_ipv4root_legacy_internal (
- unsigned long ip[],
- int nb,
- unsigned long bcast,
- unsigned long mask[])
-{
- init();
- if (rev_ipv4root == 0){
- if (nb > 1){
- WRITE_MSG(2,"set_ipv4root: Several IP number specified, but this kernel only supports one. Ignored\n");
- }
- return set_ipv4root_rev0 (ip[0]);
- }else if (rev_ipv4root == 1){
- if (nb > 1){
- WRITE_MSG(2,"set_ipv4root: Several IP number specified, but this kernel only supports one. Ignored\n");
- }
- return set_ipv4root_rev1 (ip[0],bcast);
- }else if (rev_ipv4root == 2){
- return set_ipv4root_rev2 (ip,nb,bcast);
- }else if (rev_ipv4root == 3){
- return set_ipv4root_rev3 (ip,nb,bcast,mask);
- }
- errno = EINVAL;
- return -1;
-}
-
-static ALWAYSINLINE int
-vc_set_ipv4root_legacy(uint32_t bcast, size_t nb, struct vc_ip_mask_pair const *ips)
-{
- unsigned long ip[nb];
- unsigned long mask[nb];
- size_t i;
-
- for (i=0; i<nb; ++i) {
- ip[i] = ips[i].ip;
- mask[i] = ips[i].mask;
- }
-
- return vc_set_ipv4root_legacy_internal(ip, nb, bcast, mask);
-}
git://git.onelab.eu / util-vserver.git / blobdiff