From b4df15d1e119994ad1f3e73c1283414d2eb30a5f Mon Sep 17 00:00:00 2001 From: Ben Lindstrom Date: Sun, 15 Oct 2000 00:17:36 +0000 Subject: - (bal) Add support for realpath and getcwd for platforms with broken or missing realpath implementations for sftp-server. - (bal) Corrected mistake in INSTALL in regards to GNU rx library --- bsd-realpath.c | 163 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 163 insertions(+) create mode 100644 bsd-realpath.c (limited to 'bsd-realpath.c') diff --git a/bsd-realpath.c b/bsd-realpath.c new file mode 100644 index 000000000..103dcc256 --- /dev/null +++ b/bsd-realpath.c @@ -0,0 +1,163 @@ +/* + * Copyright (c) 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Jan-Simon Pendry. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "includes.h" + +#if !defined(HAVE_REALPATH) || defined(BROKEN_REALPATH) + +#if defined(LIBC_SCCS) && !defined(lint) +static char *rcsid = "$OpenBSD: realpath..c,v 1.4 1998/05/18 09:55:19 deraadt Exp $"; +#endif /* LIBC_SCCS and not lint */ + +#include +#include + +#include +#include +#include +#include +#include + +/* + * S_ISLNK compatibility + */ +#ifndef S_ISLNK +#define S_ISLNK(m) ((m & 0170000) == 0120000) +#endif + +/* + * char *realpath(const char *path, char resolved_path[MAXPATHLEN]); + * + * Find the real name of path, by removing all ".", ".." and symlink + * components. Returns (resolved) on success, or (NULL) on failure, + * in which case the path which caused trouble is left in (resolved). + */ +char * +realpath(const char *path, char *resolved) +{ + struct stat sb; + int fd, n, rootd, serrno = 0; + char *p, *q, wbuf[MAXPATHLEN], start[MAXPATHLEN]; + int symlinks = 0; + + /* Save the starting point. */ + getcwd(start,MAXPATHLEN); + if ((fd = open(".", O_RDONLY)) < 0) { + (void)strcpy(resolved, "."); + return (NULL); + } + close(fd); + + /* + * Find the dirname and basename from the path to be resolved. + * Change directory to the dirname component. + * lstat the basename part. + * if it is a symlink, read in the value and loop. + * if it is a directory, then change to that directory. + * get the current directory name and append the basename. + */ + (void)strncpy(resolved, path, MAXPATHLEN - 1); + resolved[MAXPATHLEN - 1] = '\0'; +loop: + q = strrchr(resolved, '/'); + if (q != NULL) { + p = q + 1; + if (q == resolved) + q = "/"; + else { + do { + --q; + } while (q > resolved && *q == '/'); + q[1] = '\0'; + q = resolved; + } + if (chdir(q) < 0) + goto err1; + } else + p = resolved; + + /* Deal with the last component. */ + if (lstat(p, &sb) == 0) { + if (S_ISLNK(sb.st_mode)) { + if (++symlinks > MAXSYMLINKS) { + serrno = ELOOP; + goto err1; + } + n = readlink(p, resolved, MAXPATHLEN-1); + if (n < 0) + goto err1; + resolved[n] = '\0'; + goto loop; + } + if (S_ISDIR(sb.st_mode)) { + if (chdir(p) < 0) + goto err1; + p = ""; + } + } + + /* + * Save the last component name and get the full pathname of + * the current directory. + */ + (void)strcpy(wbuf, p); + if (getcwd(resolved, MAXPATHLEN) == 0) + goto err1; + + /* + * Join the two strings together, ensuring that the right thing + * happens if the last component is empty, or the dirname is root. + */ + if (resolved[0] == '/' && resolved[1] == '\0') + rootd = 1; + else + rootd = 0; + + if (*wbuf) { + if (strlen(resolved) + strlen(wbuf) + rootd + 1 > MAXPATHLEN) { + serrno = ENAMETOOLONG; + goto err1; + } + if (rootd == 0) + (void)strcat(resolved, "/"); + (void)strcat(resolved, wbuf); + } + + /* Go back to where we came from. */ + if (chdir(start) < 0) { + serrno = errno; + goto err2; + } + return (resolved); + +err1: chdir(start); +err2: errno = serrno; + return (NULL); +} +#endif /* !defined(HAVE_REALPATH) || defined(BROKEN_REALPATH) */ -- cgit v1.2.3