da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/***********************************************************************
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* This software is part of the ast package *
3e14f97f673e8a630f076077de35afdd43dc1587Roger A. Faulkner* Copyright (c) 1985-2010 AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* and is licensed under the *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Common Public License, Version 1.0 *
7c2fbfb345896881c631598ee3852ce9ce33fb07April Chin* by AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* A copy of the License is available at *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* http://www.opensource.org/licenses/cpl1.0.txt *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Information and Software Systems Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* AT&T Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Florham Park NJ *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Glenn Fowler <gsf@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* David Korn <dgk@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Phong Vo <kpv@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin***********************************************************************/
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#pragma prototyped
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * AT&T Bell Laboratories
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * return the real absolute pathname of the preroot dir for cmd
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * if cmd==0 then current preroot path returned
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <ast.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <preroot.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if FS_PREROOT
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <ast_dir.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <ls.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <error.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <stdio.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#ifndef ERANGE
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#define ERANGE E2BIG
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#define ERROR(e) {errno=e;goto error;}
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinchar*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chingetpreroot(char* path, const char* cmd)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin{
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register int c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register FILE* fp;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register char* p;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin char buf[PATH_MAX];
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (!path) path = buf;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (cmd)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin sfsprintf(buf, sizeof(buf), "set x `%s= %s - </dev/null 2>&1`\nwhile :\ndo\nshift\ncase $# in\n[012]) break ;;\nesac\ncase \"$1 $2\" in\n\"+ %s\") echo $3; exit ;;\nesac\ndone\necho\n", PR_SILENT, cmd, PR_COMMAND);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (!(fp = popen(buf, "rug"))) return(0);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin for (p = path; (c = getc(fp)) != EOF && c != '\n'; *p++ = c);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *p = 0;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin pclose(fp);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (path == p) return(0);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return(path == buf ? strdup(path) : path);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin char* d;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin DIR* dirp = 0;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin int namlen;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin int euid;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin int ruid;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin struct dirent* entry;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin struct stat* cur;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin struct stat* par;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin struct stat* tmp;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin struct stat curst;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin struct stat parst;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin struct stat tstst;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin char dots[PATH_MAX];
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin cur = &curst;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin par = &parst;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if ((ruid = getuid()) != (euid = geteuid())) setuid(ruid);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (stat(PR_REAL, cur) || stat("/", par) || cur->st_dev == par->st_dev && cur->st_ino == par->st_ino) ERROR(ENOTDIR);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin /*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * like getcwd() but starting at the preroot
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin d = dots;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *d++ = '/';
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin p = path + PATH_MAX - 1;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *p = 0;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin for (;;)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin tmp = cur;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin cur = par;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin par = tmp;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if ((d - dots) > (PATH_MAX - 4)) ERROR(ERANGE);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *d++ = '.';
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *d++ = '.';
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *d = 0;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (!(dirp = opendir(dots))) ERROR(errno);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if !_dir_ok || _mem_dd_fd_DIR
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (fstat(dirp->dd_fd, par)) ERROR(errno);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (stat(dots, par)) ERROR(errno);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *d++ = '/';
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (par->st_dev == cur->st_dev)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (par->st_ino == cur->st_ino)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin closedir(dirp);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *--p = '/';
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (ruid != euid) setuid(euid);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (path == buf) return(strdup(p));
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (path != p)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin d = path;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin while (*d++ = *p++);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return(path);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#ifdef D_FILENO
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin while (entry = readdir(dirp))
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (D_FILENO(entry) == cur->st_ino)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin namlen = D_NAMLEN(entry);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin goto found;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin /*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * this fallthrough handles logical naming
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin rewinddir(dirp);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin do
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (!(entry = readdir(dirp))) ERROR(ENOENT);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin namlen = D_NAMLEN(entry);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if ((d - dots) > (PATH_MAX - 1 - namlen)) ERROR(ERANGE);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin memcpy(d, entry->d_name, namlen + 1);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (stat(dots, &tstst)) ERROR(errno);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin } while (tstst.st_ino != cur->st_ino || tstst.st_dev != cur->st_dev);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin found:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (*p) *--p = '/';
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if ((p -= namlen) <= (path + 1)) ERROR(ERANGE);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin memcpy(p, entry->d_name, namlen);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin closedir(dirp);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin dirp = 0;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin error:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (dirp) closedir(dirp);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (ruid != euid) setuid(euid);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return(0);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin}
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinNoN(getpreroot)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif