1 /*	$OpenBSD: sftp-realpath.c,v 1.2 2021/09/02 21:03:54 deraadt Exp $ */
46 /* XXX rewrite sftp-server to use POSIX realpath and remove this hack */
55  * in which case the path which caused trouble is left in (resolved).
65 	char left[PATH_MAX], next_token[PATH_MAX], symlink[PATH_MAX];  in sftp_realpath()  local
89 		left_len = strlcpy(left, path + 1, sizeof(left));  in sftp_realpath()
99 		left_len = strlcpy(left, path, sizeof(left));  in sftp_realpath()
101 	if (left_len >= sizeof(left) || resolved_len >= PATH_MAX) {  in sftp_realpath()
107 	 * Iterate over path components in `left'.  in sftp_realpath()
111 		 * Extract the next path component and adjust `left'  in sftp_realpath()
114 		p = strchr(left, '/');  in sftp_realpath()
115 		s = p ? p : left + left_len;  in sftp_realpath()
116 		if (s - left >= (ptrdiff_t)sizeof(next_token)) {  in sftp_realpath()
120 		memcpy(next_token, left, s - left);  in sftp_realpath()
121 		next_token[s - left] = '\0';  in sftp_realpath()
122 		left_len -= s - left;  in sftp_realpath()
124 			memmove(left, s + 1, left_len + 1);  in sftp_realpath()
125 		if (resolved[resolved_len - 1] != '/') {  in sftp_realpath()
143 				resolved[resolved_len - 1] = '\0';  in sftp_realpath()
146 				resolved_len = q - resolved;  in sftp_realpath()
154 		 * there are no more path components left.  in sftp_realpath()
173 			slen = readlink(resolved, symlink, sizeof(symlink) - 1);  in sftp_realpath()
182 				resolved[resolved_len - 1] = '\0';  in sftp_realpath()
185 				resolved_len = q - resolved;  in sftp_realpath()
189 			 * If there are any path components left, then  in sftp_realpath()
191 			 * in `left'.  in sftp_realpath()
194 				if (symlink[slen - 1] != '/') {  in sftp_realpath()
203 				left_len = strlcat(symlink, left, sizeof(symlink));  in sftp_realpath()
209 			left_len = strlcpy(left, symlink, sizeof(left));  in sftp_realpath()
217 	if (resolved_len > 1 && resolved[resolved_len - 1] == '/')  in sftp_realpath()
218 		resolved[resolved_len - 1] = '\0';  in sftp_realpath()