// $Id: syscall-legacy.hc,v 1.1.4.6 2004/02/05 03:52:45 ensc Exp $ --*- c -*-- // Copyright (C) 2003 Enrico Scholz // 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 #include #include #include #include #include // 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