--- /dev/null
+// $Id$ --*- 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);
+}