diff options
Diffstat (limited to 'src/core/settings/plugins/ifupdown/nms-ifupdown-interface-parser.c')
| -rw-r--r-- | src/core/settings/plugins/ifupdown/nms-ifupdown-interface-parser.c | 388 |
1 files changed, 388 insertions, 0 deletions
diff --git a/src/core/settings/plugins/ifupdown/nms-ifupdown-interface-parser.c b/src/core/settings/plugins/ifupdown/nms-ifupdown-interface-parser.c new file mode 100644 index 00000000..a8a9c40a --- /dev/null +++ b/src/core/settings/plugins/ifupdown/nms-ifupdown-interface-parser.c @@ -0,0 +1,388 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Tom Parker <palfrey@tevp.net> + * Copyright (C) 2004 Tom Parker + */ + +#include "src/core/nm-default-daemon.h" + +#include "nms-ifupdown-interface-parser.h" + +#include <stdio.h> +#include <stdlib.h> +#include <wordexp.h> +#include <libgen.h> + +#include "nm-utils.h" + +/*****************************************************************************/ + +static void +_ifparser_source(if_parser *parser, const char *path, const char *en_dir, int quiet, int dir); + +/*****************************************************************************/ + +#define _NMLOG_PREFIX_NAME "ifupdown" +#define _NMLOG_DOMAIN LOGD_SETTINGS +#define _NMLOG(level, ...) \ + nm_log((level), \ + _NMLOG_DOMAIN, \ + NULL, \ + NULL, \ + "%s" _NM_UTILS_MACRO_FIRST(__VA_ARGS__), \ + _NMLOG_PREFIX_NAME ": " _NM_UTILS_MACRO_REST(__VA_ARGS__)) + +/*****************************************************************************/ + +static void +add_block(if_parser *parser, const char *type, const char *name) +{ + if_block *ifb; + gsize l_type, l_name; + + l_type = strlen(type) + 1; + l_name = strlen(name) + 1; + + ifb = g_malloc(sizeof(if_block) + l_type + l_name); + memcpy((char *) ifb->name, name, l_name); + ifb->type = &ifb->name[l_name]; + memcpy((char *) ifb->type, type, l_type); + c_list_init(&ifb->data_lst_head); + c_list_link_tail(&parser->block_lst_head, &ifb->block_lst); +} + +static void +add_data(if_parser *parser, const char *key, const char *data) +{ + if_block *last_block; + if_data * ifd; + char * idx; + gsize l_key, l_data; + + last_block = c_list_last_entry(&parser->block_lst_head, if_block, block_lst); + + /* Check if there is a block where we can attach our data */ + if (!last_block) + return; + + l_key = strlen(key) + 1; + l_data = strlen(data) + 1; + + ifd = g_malloc(sizeof(if_data) + l_key + l_data); + memcpy((char *) ifd->key, key, l_key); + ifd->data = &ifd->key[l_key]; + memcpy((char *) ifd->data, data, l_data); + + /* Normalize keys. Convert '_' to '-', as ifupdown accepts both variants. + * When querying keys via ifparser_getkey(), use '-'. */ + idx = (char *) ifd->key; + while ((idx = strchr(idx, '_'))) + *(idx++) = '-'; + + c_list_link_tail(&last_block->data_lst_head, &ifd->data_lst); +} + +/* join values in src with spaces into dst; dst needs to be large enough */ +static char * +join_values_with_spaces(char *dst, char **src) +{ + if (dst != NULL) { + *dst = '\0'; + if (src != NULL && *src != NULL) { + strcat(dst, *src); + + for (src++; *src != NULL; src++) { + strcat(dst, " "); + strcat(dst, *src); + } + } + } + return (dst); +} + +static void +_recursive_ifparser(if_parser *parser, const char *eni_file, int quiet) +{ + FILE *inp; + char line[255]; + int skip_to_block = 1; + int skip_long_line = 0; + int offs = 0; + + /* Check if interfaces file exists and open it */ + if (!g_file_test(eni_file, G_FILE_TEST_EXISTS)) { + if (!quiet) + _LOGW("interfaces file %s doesn't exist", eni_file); + return; + } + inp = fopen(eni_file, "re"); + if (inp == NULL) { + if (!quiet) + _LOGW("Can't open %s", eni_file); + return; + } + if (!quiet) + _LOGI(" interface-parser: parsing file %s", eni_file); + + while (!feof(inp)) { + char *token[128]; /* 255 chars can only be split into 127 tokens */ + char value[255]; /* large enough to join previously split tokens */ + char *safeptr; + int toknum; + int len = 0; + + char *ptr = fgets(line + offs, 255 - offs, inp); + if (ptr == NULL) + break; + + len = strlen(line); + /* skip over-long lines */ + if (!feof(inp) && len > 0 && line[len - 1] != '\n') { + if (!skip_long_line) { + if (!quiet) + _LOGW("Skipping over-long-line '%s...'", line); + } + skip_long_line = 1; + continue; + } + + /* trailing '\n' found: remove it & reset offset to 0 */ + if (len > 0 && line[len - 1] == '\n') { + line[--len] = '\0'; + offs = 0; + } + + /* if we're in long_line_skip mode, terminate it for real next line */ + if (skip_long_line) { + if (len == 0 || line[len - 1] != '\\') + skip_long_line = 0; + continue; + } + + /* unwrap wrapped lines */ + if (len > 0 && line[len - 1] == '\\') { + offs = len - 1; + continue; + } + +#define SPACES " \t" + /* tokenize input; */ + for (toknum = 0, token[toknum] = strtok_r(line, SPACES, &safeptr); token[toknum] != NULL; + toknum++, token[toknum] = strtok_r(NULL, SPACES, &safeptr)) + ; + + /* ignore comments and empty lines */ + if (toknum == 0 || *token[0] == '#') + continue; + + if (toknum < 2) { + if (!quiet) { + _LOGW("Can't parse interface line '%s'", join_values_with_spaces(value, token)); + } + skip_to_block = 1; + continue; + } + + /* There are six different stanzas: + * iface, mapping, auto, allow-*, source, and source-directory. + * Create a block for each of them except source and source-directory. */ + + /* iface stanza takes at least 3 parameters */ + if (nm_streq(token[0], "iface")) { + if (toknum < 4) { + if (!quiet) { + _LOGW("Can't parse iface line '%s'", join_values_with_spaces(value, token)); + } + continue; + } + add_block(parser, token[0], token[1]); + skip_to_block = 0; + add_data(parser, token[2], join_values_with_spaces(value, token + 3)); + } + /* auto and allow-auto stanzas are equivalent, + * both can take multiple interfaces as parameters: add one block for each */ + else if (NM_IN_STRSET(token[0], "auto", "allow-auto")) { + int i; + + for (i = 1; i < toknum; i++) + add_block(parser, "auto", token[i]); + skip_to_block = 0; + } else if (nm_streq(token[0], "mapping")) { + add_block(parser, token[0], join_values_with_spaces(value, token + 1)); + skip_to_block = 0; + } + /* allow-* can take multiple interfaces as parameters: add one block for each */ + else if (g_str_has_prefix(token[0], "allow-")) { + int i; + for (i = 1; i < toknum; i++) + add_block(parser, token[0], token[i]); + skip_to_block = 0; + } + /* source and source-directory stanzas take one or more paths as parameters */ + else if (NM_IN_STRSET(token[0], "source", "source-directory")) { + int i; + char *en_dir; + + skip_to_block = 0; + en_dir = g_path_get_dirname(eni_file); + for (i = 1; i < toknum; ++i) { + if (nm_streq(token[0], "source-directory")) + _ifparser_source(parser, token[i], en_dir, quiet, TRUE); + else + _ifparser_source(parser, token[i], en_dir, quiet, FALSE); + } + g_free(en_dir); + } else { + if (skip_to_block) { + if (!quiet) { + _LOGW("ignoring out-of-block data '%s'", join_values_with_spaces(value, token)); + } + } else + add_data(parser, token[0], join_values_with_spaces(value, token + 1)); + } + } + fclose(inp); + + if (!quiet) + _LOGI(" interface-parser: finished parsing file %s", eni_file); +} + +static void +_ifparser_source(if_parser *parser, const char *path, const char *en_dir, int quiet, int dir) +{ + char * abs_path; + const char *item; + wordexp_t we; + GDir * source_dir; + GError * error = NULL; + uint i; + + if (g_path_is_absolute(path)) + abs_path = g_strdup(path); + else + abs_path = g_build_filename(en_dir, path, NULL); + + if (!quiet) + _LOGI(" interface-parser: source line includes interfaces file(s) %s", abs_path); + + /* ifupdown uses WRDE_NOCMD for wordexp. */ + if (wordexp(abs_path, &we, WRDE_NOCMD)) { + if (!quiet) + _LOGW("word expansion for %s failed", abs_path); + } else { + for (i = 0; i < we.we_wordc; i++) { + if (dir) { + source_dir = g_dir_open(we.we_wordv[i], 0, &error); + if (!source_dir) { + if (!quiet) { + _LOGW("Failed to open directory %s: %s", we.we_wordv[i], error->message); + } + g_clear_error(&error); + } else { + while ((item = g_dir_read_name(source_dir))) + _ifparser_source(parser, item, we.we_wordv[i], quiet, FALSE); + g_dir_close(source_dir); + } + } else + _recursive_ifparser(parser, we.we_wordv[i], quiet); + } + wordfree(&we); + } + g_free(abs_path); +} + +if_parser * +ifparser_parse(const char *eni_file, int quiet) +{ + if_parser *parser; + + parser = g_slice_new(if_parser); + c_list_init(&parser->block_lst_head); + _recursive_ifparser(parser, eni_file, quiet); + return parser; +} + +static void +_destroy_data(if_data *ifd) +{ + c_list_unlink_stale(&ifd->data_lst); + g_free(ifd); +} + +static void +_destroy_block(if_block *ifb) +{ + if_data *ifd; + + while ((ifd = c_list_first_entry(&ifb->data_lst_head, if_data, data_lst))) + _destroy_data(ifd); + c_list_unlink_stale(&ifb->block_lst); + g_free(ifb); +} + +void +ifparser_destroy(if_parser *parser) +{ + if_block *ifb; + + while ((ifb = c_list_first_entry(&parser->block_lst_head, if_block, block_lst))) + _destroy_block(ifb); + g_slice_free(if_parser, parser); +} + +if_block * +ifparser_getfirst(if_parser *parser) +{ + return c_list_first_entry(&parser->block_lst_head, if_block, block_lst); +} + +guint +ifparser_get_num_blocks(if_parser *parser) +{ + return c_list_length(&parser->block_lst_head); +} + +if_block * +ifparser_getif(if_parser *parser, const char *iface) +{ + if_block *ifb; + + c_list_for_each_entry (ifb, &parser->block_lst_head, block_lst) { + if (nm_streq(ifb->type, "iface") && nm_streq(ifb->name, iface)) + return ifb; + } + return NULL; +} + +static if_data * +ifparser_findkey(if_block *iface, const char *key) +{ + if_data *ifd; + + c_list_for_each_entry (ifd, &iface->data_lst_head, data_lst) { + if (nm_streq(ifd->key, key)) + return ifd; + } + return NULL; +} + +const char * +ifparser_getkey(if_block *iface, const char *key) +{ + if_data *ifd; + + ifd = ifparser_findkey(iface, key); + return ifd ? ifd->data : NULL; +} + +gboolean +ifparser_haskey(if_block *iface, const char *key) +{ + return !!ifparser_findkey(iface, key); +} + +guint +ifparser_get_num_info(if_block *iface) +{ + return c_list_length(&iface->data_lst_head); +} |