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pkgconf-3.0.1
libpkgconf/path.c
634 строки
15 KB
Ariadne Conill
libpkgconf: path: harden against buffer-related OOMs
03 июл 2026, 03:18
03 июл 2026, 03:18
5a3f911
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/* * path.c * filesystem path management * * SPDX-License-Identifier: pkgconf * * Copyright (c) 2016 pkgconf authors (see AUTHORS). * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * This software is provided 'as is' and without any warranty, express or * implied. In no event shall the authors be liable for any damages arising * from the use of this software. */ #include <libpkgconf/config.h> #include <libpkgconf/stdinc.h> #include <libpkgconf/libpkgconf.h> #include <libpkgconf/path.h> #if defined(HAVE_SYS_STAT_H) && ! defined(_WIN32) # include <sys/stat.h> # define PKGCONF_CACHE_INODES #endif static bool #ifdef PKGCONF_CACHE_INODES path_list_contains_entry(const pkgconf_buffer_t *text, pkgconf_list_t *dirlist, struct stat *st) #else path_list_contains_entry(const pkgconf_buffer_t *text, pkgconf_list_t *dirlist) #endif { pkgconf_node_t *n; PKGCONF_FOREACH_LIST_ENTRY(dirlist->head, n) { pkgconf_path_t *pn = n->data; #ifdef PKGCONF_CACHE_INODES if (pn->handle_device == (void *)(intptr_t)st->st_dev && pn->handle_path == (void *)(intptr_t)st->st_ino) return true; #endif if (!strcmp(pkgconf_buffer_str(text), pn->path)) return true; } return false; } /* * !doc * * libpkgconf `path` module * ======================== * * The `path` module provides functions for manipulating lists of paths in a cross-platform manner. Notably, * it is used by the `pkgconf client` to parse the ``PKG_CONFIG_PATH``, ``PKG_CONFIG_LIBDIR`` and related environment * variables. */ static pkgconf_path_t * prepare_path_node(const char *text, pkgconf_list_t *dirlist, bool filter) { pkgconf_path_t *node; pkgconf_buffer_t pathbuf = PKGCONF_BUFFER_INITIALIZER; if (!pkgconf_buffer_append(&pathbuf, text)) return NULL; if (!pkgconf_path_relocate(&pathbuf)) { pkgconf_buffer_finalize(&pathbuf); return NULL; } #ifdef PKGCONF_CACHE_INODES struct stat st; if (filter) { if (lstat(pkgconf_buffer_str(&pathbuf), &st) == -1) { pkgconf_buffer_finalize(&pathbuf); return NULL; } if (S_ISLNK(st.st_mode)) { char realpathbuf[PKGCONF_ITEM_SIZE * 4]; char *linkdest = realpath(pkgconf_buffer_str(&pathbuf), realpathbuf); if (linkdest != NULL && stat(linkdest, &st) == -1) { pkgconf_buffer_finalize(&pathbuf); return NULL; } } if (path_list_contains_entry(&pathbuf, dirlist, &st)) { pkgconf_buffer_finalize(&pathbuf); return NULL; } } #else if (filter && path_list_contains_entry(&pathbuf, dirlist)) { pkgconf_buffer_finalize(&pathbuf); return NULL; } #endif node = calloc(1, sizeof(pkgconf_path_t)); if (node == NULL) { pkgconf_buffer_finalize(&pathbuf); return NULL; } node->path = pkgconf_buffer_freeze(&pathbuf); if (node->path == NULL) { free(node); return NULL; } #ifdef PKGCONF_CACHE_INODES if (filter) { node->handle_path = (void *)(intptr_t) st.st_ino; node->handle_device = (void *)(intptr_t) st.st_dev; } #endif return node; } /* * !doc * * .. c:function:: void pkgconf_path_add(const char *text, pkgconf_list_t *dirlist) * * Adds a path node to a path list. If the path is already in the list, do nothing. * * :param char* text: The path text to add as a path node. * :param pkgconf_list_t* dirlist: The path list to add the path node to. * :param bool filter: Whether to perform duplicate filtering. * :return: nothing */ void pkgconf_path_add(const char *text, pkgconf_list_t *dirlist, bool filter) { pkgconf_path_t *node = prepare_path_node(text, dirlist, filter); if (node == NULL) return; pkgconf_node_insert_tail(&node->lnode, node, dirlist); } /* * !doc * * .. c:function:: void pkgconf_path_prepend(const char *text, pkgconf_list_t *dirlist) * * Prepends a path node to a path list. If the path is already in the list, do nothing. * * :param char* text: The path text to add as a path node. * :param pkgconf_list_t* dirlist: The path list to add the path node to. * :param bool filter: Whether to perform duplicate filtering. * :return: nothing */ void pkgconf_path_prepend(const char *text, pkgconf_list_t *dirlist, bool filter) { pkgconf_path_t *node = prepare_path_node(text, dirlist, filter); if (node == NULL) return; pkgconf_node_insert(&node->lnode, node, dirlist); } /* * !doc * * .. c:function:: size_t pkgconf_path_split(const char *text, pkgconf_list_t *dirlist) * * Splits a given text input and inserts paths into a path list. * * :param char* text: The path text to split and add as path nodes. * :param pkgconf_list_t* dirlist: The path list to have the path nodes added to. * :param bool filter: Whether to perform duplicate filtering. * :return: number of path nodes added to the path list * :rtype: size_t */ size_t pkgconf_path_split(const char *text, pkgconf_list_t *dirlist, bool filter) { size_t count = 0; char *workbuf, *p, *iter; if (text == NULL) return 0; iter = workbuf = strdup(text); if (workbuf == NULL) return 0; while ((p = strtok(iter, PKG_CONFIG_PATH_SEP_S)) != NULL) { pkgconf_path_add(p, dirlist, filter); count++, iter = NULL; } free(workbuf); return count; } /* * !doc * * .. c:function:: size_t pkgconf_path_build_from_environ(const char *envvarname, const char *fallback, pkgconf_list_t *dirlist) * * Adds the paths specified in an environment variable to a path list. If the environment variable is not set, * an optional default set of paths is added. * * :param pkgconf_client_t* client: The client to use for environmental variable lookup (can be NULL). * :param char* envvarname: The environment variable to look up. * :param char* fallback: The fallback paths to use if the environment variable is not set. * :param pkgconf_list_t* dirlist: The path list to add the path nodes to. * :param bool filter: Whether to perform duplicate filtering. * :return: number of path nodes added to the path list * :rtype: size_t */ size_t pkgconf_path_build_from_environ(const pkgconf_client_t *client, const char *envvarname, const char *fallback, pkgconf_list_t *dirlist, bool filter) { const char *data; data = pkgconf_client_getenv(client, envvarname); if (data != NULL) return pkgconf_path_split(data, dirlist, filter); if (fallback != NULL) return pkgconf_path_split(fallback, dirlist, filter); /* no fallback and no environment variable, thusly no nodes added */ return 0; } /* * !doc * * .. c:function:: bool pkgconf_path_match_list(const char *path, const pkgconf_list_t *dirlist) * * Checks whether a path has a matching prefix in a path list. * * :param char* path: The path to check against a path list. * :param pkgconf_list_t* dirlist: The path list to check the path against. * :return: true if the path list has a matching prefix, otherwise false * :rtype: bool */ bool pkgconf_path_match_list(const char *path, const pkgconf_list_t *dirlist) { pkgconf_node_t *n = NULL; pkgconf_buffer_t relocated = PKGCONF_BUFFER_INITIALIZER; const char *cpath = path; if (path == NULL) return false; if (!pkgconf_buffer_append(&relocated, path)) return false; cpath = pkgconf_buffer_str(&relocated); if (pkgconf_path_relocate(&relocated)) cpath = pkgconf_buffer_str(&relocated); if (cpath == NULL) { pkgconf_buffer_finalize(&relocated); return false; } PKGCONF_FOREACH_LIST_ENTRY(dirlist->head, n) { pkgconf_path_t *pnode = n->data; if (!strcmp(pnode->path, cpath)) { pkgconf_buffer_finalize(&relocated); return true; } } pkgconf_buffer_finalize(&relocated); return false; } /* * !doc * * .. c:function:: void pkgconf_path_copy_list(pkgconf_list_t *dst, const pkgconf_list_t *src) * * Copies a path list to another path list. * * :param pkgconf_list_t* dst: The path list to copy to. * :param pkgconf_list_t* src: The path list to copy from. * :return: nothing */ void pkgconf_path_copy_list(pkgconf_list_t *dst, const pkgconf_list_t *src) { pkgconf_node_t *n; PKGCONF_FOREACH_LIST_ENTRY(src->head, n) { pkgconf_path_t *srcpath = n->data, *path; path = calloc(1, sizeof(pkgconf_path_t)); if (path == NULL) continue; path->path = strdup(srcpath->path); if (path->path == NULL) { free(path); continue; } #ifdef PKGCONF_CACHE_INODES path->handle_path = srcpath->handle_path; path->handle_device = srcpath->handle_device; #endif pkgconf_node_insert_tail(&path->lnode, path, dst); } } /* * !doc * * .. c:function:: void pkgconf_path_prepend_list(pkgconf_list_t *dst, const pkgconf_list_t *src) * * Copies a path list to another path list. * * :param pkgconf_list_t* dst: The path list to copy to. * :param pkgconf_list_t* src: The path list to copy from. * :return: nothing */ void pkgconf_path_prepend_list(pkgconf_list_t *dst, const pkgconf_list_t *src) { pkgconf_node_t *n; PKGCONF_FOREACH_LIST_ENTRY(src->head, n) { pkgconf_path_t *srcpath = n->data, *path; path = calloc(1, sizeof(pkgconf_path_t)); if (path == NULL) continue; path->path = strdup(srcpath->path); if (path->path == NULL) { free(path); continue; } #ifdef PKGCONF_CACHE_INODES path->handle_path = srcpath->handle_path; path->handle_device = srcpath->handle_device; #endif pkgconf_node_insert(&path->lnode, path, dst); } } /* * !doc * * .. c:function:: void pkgconf_path_free(pkgconf_list_t *dirlist) * * Releases any path nodes attached to the given path list. * * :param pkgconf_list_t* dirlist: The path list to clean up. * :return: nothing */ void pkgconf_path_free(pkgconf_list_t *dirlist) { pkgconf_node_t *n, *tn; PKGCONF_FOREACH_LIST_ENTRY_SAFE(dirlist->head, tn, n) { pkgconf_path_t *pnode = n->data; free(pnode->path); free(pnode); } pkgconf_list_zero(dirlist); } static char * normpath(const pkgconf_buffer_t *pathbuf) { if (!pathbuf || pkgconf_buffer_len(pathbuf) == 0) return NULL; const char *path = pkgconf_buffer_str(pathbuf); char *copy = strdup(path); if (NULL == copy) return NULL; char *ptr = copy; for (int ii = 0; copy[ii]; ii++) { *ptr++ = path[ii]; if ('/' == path[ii]) { ii++; while ('/' == path[ii]) ii++; ii--; } } *ptr = '\0'; return copy; } /* * !doc * * .. c:function:: bool pkgconf_path_relocate(pkgconf_buffer_t *buf) * * Relocates a path, possibly calling normpath() on it. * * :param pkgconf_buffer_t* buf: The path to relocate. * :return: true on success, false on error * :rtype: bool */ bool pkgconf_path_relocate(pkgconf_buffer_t *buf) { char *tmpbuf; if ((tmpbuf = normpath(buf)) != NULL) { pkgconf_buffer_reset(buf); bool ret = pkgconf_buffer_append(buf, tmpbuf); free(tmpbuf); return ret; } return true; } /* * !doc * * .. c:function:: bool pkgconf_path_trim_basename(pkgconf_buffer_t *buf) * * Trims the basename from a path. * * :param pkgconf_buffer_t* buf: The path to trim. * :return: true if a separator was found and the path was trimmed, false otherwise * :rtype: bool */ bool pkgconf_path_trim_basename(pkgconf_buffer_t *buf) { char *sep; if (!pkgconf_buffer_len(buf)) return false; sep = strrchr(buf->base, PKG_DIR_SEP_S); #ifdef _WIN32 char *sep2 = strrchr(buf->base, '/'); if (sep2 != NULL && (sep == NULL || sep2 > sep)) sep = sep2; #endif if (sep != NULL) { *sep = '\0'; buf->end = sep; return true; } return false; } /* * !doc * * .. c:function:: const char *pkgconf_path_find_basename(const char *path) * * Finds the basename from a path. * * :param char* path: The path to find the basename from. * :return: a pointer to the basename * :rtype: const char * */ const char * pkgconf_path_find_basename(const char *path) { const char *sep; sep = strrchr(path, PKG_DIR_SEP_S); #ifdef _WIN32 const char *sep2 = strrchr(path, '/'); if (sep2 != NULL && (sep == NULL || sep2 > sep)) sep = sep2; #endif if (sep != NULL) return sep + 1; return path; } #ifdef _WIN32 #define PKG_CONFIG_REG_KEY "Software\\pkgconfig\\PKG_CONFIG_PATH" /* * !doc * * .. c:function:: void pkgconf_path_build_from_registry(HKEY hKey, pkgconf_list_t *dir_list, bool filter) * * Adds paths to a directory list discovered from a given registry key. * * .. warning:: * The Windows registry search path mechanism is deprecated and will be * removed in pkgconf 3.1. Use ``PKG_CONFIG_PATH`` or configure search * paths explicitly instead. Avoid using this function directly in new * code. * * :param pkgconf_client_t* client: pkgconf client * :param HKEY hKey: The registry key to enumerate. * :param pkgconf_list_t* dir_list: The directory list to append enumerated paths to. * :param bool filter: Whether duplicate paths should be filtered. * :return: number of path nodes added to the list * :rtype: size_t */ size_t pkgconf_path_build_from_registry(pkgconf_client_t *client, void *hKey, pkgconf_list_t *dir_list, bool filter) { HKEY key; int i = 0; size_t added = 0; char buf[16384]; /* per registry limits */ DWORD bufsize = sizeof buf; if (RegOpenKeyEx(hKey, PKG_CONFIG_REG_KEY, 0, KEY_READ, &key) != ERROR_SUCCESS) return 0; pkgconf_warn(client, "WARNING: support for reading PKG_CONFIG_PATH from the Windows registry " "is deprecated and will be removed in pkgconf 3.1\n"); while (RegEnumValue(key, i++, buf, &bufsize, NULL, NULL, NULL, NULL) == ERROR_SUCCESS) { char pathbuf[PKGCONF_ITEM_SIZE]; DWORD type; DWORD pathbuflen = sizeof pathbuf; if (RegQueryValueEx(key, buf, NULL, &type, (LPBYTE) pathbuf, &pathbuflen) == ERROR_SUCCESS && type == REG_SZ) { pkgconf_path_add(pathbuf, dir_list, filter); added++; } bufsize = sizeof buf; } RegCloseKey(key); return added; } #endif bool pkgconf_path_is_plausible(const pkgconf_buffer_t *buf) { const char *s; if (buf == NULL) return false; s = pkgconf_buffer_str(buf); if (s == NULL) return false; /* skip leading whitespace */ while (*s != '\0' && isspace((unsigned char)*s)) s++; if (*s == '\0') return false; /* POSIX absolute path */ if (*s == '/') return true; /* ./ or ../ relative path */ if (s[0] == '.' && (s[1] == '/' || s[1] == '\\')) return true; if (s[0] == '.' && s[1] == '.' && (s[2] == '/' || s[2] == '\\')) return true; /* Windows drive path: C:/... or C:\... */ if (isalpha((unsigned char)s[0]) && s[1] == ':' && (s[2] == '/' || s[2] == '\\')) return true; /* anything with a path separator seems plausible, for example "Program Files/MySDK" */ for (const char *p = s; *p != '\0'; p++) { if (*p == '/' || *p == '\\') return true; } return false; }