--- /dev/null
+// $Id: syscall-legacy.hc,v 1.1.4.6 2004/02/05 03:52:45 ensc Exp $ --*- 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 <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <syscall.h>
+#include <asm/unistd.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
+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
+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
+
+static int def_NR_new_s_context = 273;
+#undef __NR_new_s_context
+static int __NR_new_s_context_rev0;
+ //static int __NR_new_s_context_rev1;
+static int rev_s_context=0;
+
+#ifdef ENSC_SYSCALL_TRADITIONAL
+inline static int
+new_s_context_rev0(int newctx, int remove_cap, int flags)
+{
+ return syscall(__NR_new_s_context_rev0, newctx, remove_cap, flags);
+}
+#else
+inline static _syscall3(int, new_s_context_rev0, int, newctx, int, remove_cap, int, flags)
+ //static _syscall4(int, new_s_context_rev1, int, nbctx, int *, ctxs, int, remove_cap, int, flags)
+#endif
+
+#if 0
+#undef __NR_set_ctxlimit
+static int __NR_set_ctxlimit=-1;
+static int rev_set_ctxlimit=-1;
+
+static _syscall2 (int, set_ctxlimit, int, resource, long, limit)
+#endif
+
+static void init()
+{
+ static int is_init = 0;
+ if (!is_init){
+ FILE *fin = fopen ("/proc/self/status","r");
+ __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;
+ //__NR_new_s_context_rev1 = def_NR_new_s_context;
+ if (fin != NULL){
+ char line[100];
+ while (fgets(line,sizeof(line)-1,fin)!=NULL){
+ int num;
+ char title[100],rev[100];
+ rev[0] = '\0';
+ if (sscanf(line,"%s %d %s",title,&num,rev)>=2){
+ if (strcmp(title,"__NR_set_ipv4root:")==0){
+ __NR_set_ipv4root_rev0 = num;
+ __NR_set_ipv4root_rev1 = num;
+ __NR_set_ipv4root_rev2 = num;
+ __NR_set_ipv4root_rev3 = num;
+ if (strncmp(rev,"rev",3)==0){
+ rev_ipv4root = atoi(rev+3);
+ }
+#if 0
+ }else if (strcmp(title,"__NR_set_ctxlimit:")==0){
+ __NR_set_ctxlimit = num;
+ if (strncmp(rev,"rev",3)==0){
+ rev_set_ctxlimit = atoi(rev+3);
+ }
+#endif
+ }else if (strcmp(title,"__NR_new_s_context:")==0){
+ __NR_new_s_context_rev0 = num;
+ //__NR_new_s_context_rev1 = num;
+ if (strncmp(rev,"rev",3)==0){
+ rev_s_context = atoi(rev+3);
+ }
+ }
+ }
+ }
+ fclose (fin);
+ }
+ is_init = 1;
+ }
+}
+
+void vc_init_legacy()
+{
+ init();
+}
+
+static ALWAYSINLINE int
+vc_new_s_context_legacy(int ctx, int remove_cap, int flags)
+{
+ int ret = -1;
+ init();
+ if (rev_s_context == 0){
+ return new_s_context_rev0(ctx, remove_cap, flags);
+ }else{
+ errno = -ENOSYS;
+ ret = -1;
+ }
+ 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){
+ fprintf (stderr,"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){
+ fprintf (stderr,"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