* libuci - Library for the Unified Configuration Interface
* Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
*
- * this program is free software; you can redistribute it and/or modify
- * it under the terms of the gnu lesser general public license version 2.1
- * as published by the free software foundation
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* This file contains the code for parsing uci config files
*/
+#define _GNU_SOURCE
#include <sys/types.h>
-#include <sys/stat.h>
+#include <sys/file.h>
#include <stdbool.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <ctype.h>
-#define LINEBUF 32
-#define LINEBUF_MAX 4096
-
-static void uci_parse_error(struct uci_context *ctx, char *pos, char *reason)
-{
- struct uci_parse_context *pctx = ctx->pctx;
-
- pctx->reason = reason;
- pctx->byte = pos - pctx->buf;
- UCI_THROW(ctx, UCI_ERR_PARSE);
-}
-
-/*
- * Fetch a new line from the input stream and resize buffer if necessary
- */
-static void uci_getln(struct uci_context *ctx, int offset)
-{
- struct uci_parse_context *pctx = ctx->pctx;
- char *p;
- int ofs;
-
- if (pctx->buf == NULL) {
- pctx->buf = uci_malloc(ctx, LINEBUF);
- pctx->bufsz = LINEBUF;
- }
-
- ofs = offset;
- do {
- p = &pctx->buf[ofs];
- p[ofs] = 0;
-
- p = fgets(p, pctx->bufsz - ofs, pctx->file);
- if (!p || !*p)
- return;
-
- ofs += strlen(p);
- if (pctx->buf[ofs - 1] == '\n') {
- pctx->line++;
- pctx->buf[ofs - 1] = 0;
- return;
- }
-
- if (pctx->bufsz > LINEBUF_MAX/2)
- uci_parse_error(ctx, p, "line too long");
-
- pctx->bufsz *= 2;
- pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
- } while (1);
-}
-
/*
* Clean up all extra memory used by the parser and exporter
*/
ctx->pctx = NULL;
if (pctx->package)
- uci_free_package(pctx->package);
+ uci_free_package(&pctx->package);
if (pctx->buf)
free(pctx->buf);
free(pctx);
}
-/*
- * parse a character escaped by '\'
- * returns true if the escaped character is to be parsed
- * returns false if the escaped character is to be ignored
- */
-static inline bool parse_backslash(struct uci_context *ctx, char **str)
-{
- /* skip backslash */
- *str += 1;
-
- /* undecoded backslash at the end of line, fetch the next line */
- if (!**str) {
- *str += 1;
- uci_getln(ctx, *str - ctx->pctx->buf);
- return false;
- }
-
- /* FIXME: decode escaped char, necessary? */
- return true;
-}
-
-/*
- * move the string pointer forward until a non-whitespace character or
- * EOL is reached
- */
-static void skip_whitespace(struct uci_context *ctx, char **str)
-{
-restart:
- while (**str && isspace(**str))
- *str += 1;
-
- if (**str == '\\') {
- if (!parse_backslash(ctx, str))
- goto restart;
- }
-}
-
-static inline void addc(char **dest, char **src)
-{
- **dest = **src;
- *dest += 1;
- *src += 1;
-}
-
-/*
- * parse a double quoted string argument from the command line
- */
-static void parse_double_quote(struct uci_context *ctx, char **str, char **target)
-{
- char c;
-
- /* skip quote character */
- *str += 1;
-
- while ((c = **str)) {
- switch(c) {
- case '"':
- **target = 0;
- *str += 1;
- return;
- case '\\':
- if (!parse_backslash(ctx, str))
- continue;
- /* fall through */
- default:
- addc(target, str);
- break;
- }
- }
- uci_parse_error(ctx, *str, "unterminated \"");
-}
-
-/*
- * parse a single quoted string argument from the command line
- */
-static void parse_single_quote(struct uci_context *ctx, char **str, char **target)
-{
- char c;
- /* skip quote character */
- *str += 1;
-
- while ((c = **str)) {
- switch(c) {
- case '\'':
- **target = 0;
- *str += 1;
- return;
- default:
- addc(target, str);
- }
- }
- uci_parse_error(ctx, *str, "unterminated '");
-}
-
-/*
- * parse a string from the command line and detect the quoting style
- */
-static void parse_str(struct uci_context *ctx, char **str, char **target)
-{
- do {
- switch(**str) {
- case '\'':
- parse_single_quote(ctx, str, target);
- break;
- case '"':
- parse_double_quote(ctx, str, target);
- break;
- case 0:
- goto done;
- case '\\':
- if (!parse_backslash(ctx, str))
- continue;
- /* fall through */
- default:
- addc(target, str);
- break;
- }
- } while (**str && !isspace(**str));
-done:
-
- /*
- * if the string was unquoted and we've stopped at a whitespace
- * character, skip to the next one, because the whitespace will
- * be overwritten by a null byte here
- */
- if (**str)
- *str += 1;
-
- /* terminate the parsed string */
- **target = 0;
-}
-
-/*
- * extract the next argument from the command line
- */
-static char *next_arg(struct uci_context *ctx, char **str, bool required, bool name)
-{
- char *val;
- char *ptr;
-
- val = ptr = *str;
- skip_whitespace(ctx, str);
- parse_str(ctx, str, &ptr);
- if (required && !*val)
- uci_parse_error(ctx, *str, "insufficient arguments");
- if (name && !uci_validate_name(val))
- uci_parse_error(ctx, val, "invalid character in field");
-
- return val;
-}
/*
* verify that the end of the line or command is reached.
char *tmp;
tmp = next_arg(ctx, str, false, false);
- if (tmp && *tmp)
+ if (*tmp && (ctx->flags & UCI_FLAG_STRICT))
uci_parse_error(ctx, *str, "too many arguments");
}
uci_switch_config(ctx);
}
+/* Based on an efficient hash function published by D. J. Bernstein */
+static unsigned int djbhash(unsigned int hash, char *str)
+{
+ int len = strlen(str);
+ int i;
+
+ /* initial value */
+ if (hash == ~0)
+ hash = 5381;
+
+ for(i = 0; i < len; i++) {
+ hash = ((hash << 5) + hash) + str[i];
+ }
+ return (hash & 0x7FFFFFFF);
+}
+
+/* fix up an unnamed section */
+static void uci_fixup_section(struct uci_context *ctx, struct uci_section *s)
+{
+ unsigned int hash = ~0;
+ struct uci_element *e;
+ char buf[16];
+
+ if (!s || s->e.name)
+ return;
+
+ /*
+ * Generate a name for unnamed sections. This is used as reference
+ * when locating or updating the section from apps/scripts.
+ * To make multiple concurrent versions somewhat safe for updating,
+ * the name is generated from a hash of its type and name/value
+ * pairs of its option, and it is prefixed by a counter value.
+ * If the order of the unnamed sections changes for some reason,
+ * updates to them will be rejected.
+ */
+ hash = djbhash(hash, s->type);
+ uci_foreach_element(&s->options, e) {
+ hash = djbhash(hash, e->name);
+ hash = djbhash(hash, uci_to_option(e)->value);
+ }
+ sprintf(buf, "cfg%02x%04x", ++s->package->n_section, hash % (1 << 16));
+ s->e.name = uci_strdup(ctx, buf);
+}
+
/*
* parse the 'config' uci command (open a section)
*/
static void uci_parse_config(struct uci_context *ctx, char **str)
{
+ struct uci_parse_context *pctx = ctx->pctx;
char *name = NULL;
char *type = NULL;
+ uci_fixup_section(ctx, ctx->pctx->section);
if (!ctx->pctx->package) {
if (!ctx->pctx->name)
uci_parse_error(ctx, *str, "attempting to import a file without a package name");
/* command string null-terminated by strtok */
*str += strlen(*str) + 1;
- type = next_arg(ctx, str, true, true);
+ type = next_arg(ctx, str, true, false);
+ if (!uci_validate_str(type, false))
+ uci_parse_error(ctx, type, "invalid character in field");
name = next_arg(ctx, str, false, true);
assert_eol(ctx, str);
- ctx->pctx->section = uci_alloc_section(ctx->pctx->package, type, name);
+
+ if (pctx->merge) {
+ UCI_TRAP_SAVE(ctx, error);
+ uci_set(ctx, pctx->package, name, NULL, type);
+ UCI_TRAP_RESTORE(ctx);
+ return;
+error:
+ UCI_THROW(ctx, ctx->errno);
+ } else
+ pctx->section = uci_alloc_section(pctx->package, type, name);
}
/*
*/
static void uci_parse_option(struct uci_context *ctx, char **str)
{
+ struct uci_parse_context *pctx = ctx->pctx;
char *name = NULL;
char *value = NULL;
- if (!ctx->pctx->section)
+ if (!pctx->section)
uci_parse_error(ctx, *str, "option command found before the first section");
/* command string null-terminated by strtok */
*str += strlen(*str) + 1;
name = next_arg(ctx, str, true, true);
- value = next_arg(ctx, str, true, false);
+ value = next_arg(ctx, str, false, false);
assert_eol(ctx, str);
- uci_alloc_option(ctx->pctx->section, name, value);
+
+ if (pctx->merge) {
+ UCI_TRAP_SAVE(ctx, error);
+ uci_set(ctx, pctx->package, pctx->section->e.name, name, value);
+ UCI_TRAP_RESTORE(ctx);
+ return;
+error:
+ UCI_THROW(ctx, ctx->errno);
+ } else
+ uci_alloc_option(pctx->section, name, value);
}
char *pbrk = NULL;
word = strtok_r(word, " \t", &pbrk);
+ if (!word)
+ continue;
+
switch(word[0]) {
+ case '#':
+ return;
case 'p':
if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
uci_parse_package(ctx, &word, single);
uci_foreach_element(&p->sections, s) {
struct uci_section *sec = uci_to_section(s);
fprintf(stream, "\nconfig '%s'", uci_escape(ctx, sec->type));
- fprintf(stream, " '%s'\n", uci_escape(ctx, sec->e.name));
+ if (!sec->anonymous || (ctx->flags & UCI_FLAG_EXPORT_NAME))
+ fprintf(stream, " '%s'", uci_escape(ctx, sec->e.name));
+ fprintf(stream, "\n");
uci_foreach_element(&sec->options, o) {
struct uci_option *opt = uci_to_option(o);
fprintf(stream, "\toption '%s'", uci_escape(ctx, opt->e.name));
int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single)
{
struct uci_parse_context *pctx;
+ UCI_HANDLE_ERR(ctx);
/* make sure no memory from previous parse attempts is leaked */
uci_file_cleanup(ctx);
- pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
- ctx->pctx = pctx;
+ uci_alloc_parse_context(ctx);
+ pctx = ctx->pctx;
pctx->file = stream;
+ if (*package && single) {
+ pctx->package = *package;
+ pctx->merge = true;
+ }
/*
* If 'name' was supplied, assume that the supplied stream does not contain
* the appropriate 'package <name>' string to specify the config name
* NB: the config file can still override the package name
*/
- if (name)
+ if (name) {
+ UCI_ASSERT(ctx, uci_validate_name(name));
pctx->name = name;
+ }
while (!feof(pctx->file)) {
uci_getln(ctx, 0);
-
UCI_TRAP_SAVE(ctx, error);
if (pctx->buf[0])
uci_parse_line(ctx, single);
UCI_THROW(ctx, ctx->errno);
}
+ uci_fixup_section(ctx, ctx->pctx->section);
if (package)
*package = pctx->package;
+ if (pctx->merge)
+ pctx->package = NULL;
pctx->name = NULL;
uci_switch_config(ctx);
return 0;
}
-/*
- * open a stream and go to the right position
- *
- * note: when opening for write and seeking to the beginning of
- * the stream, truncate the file
- */
-static FILE *uci_open_stream(struct uci_context *ctx, const char *filename, int pos, bool write)
-{
- struct stat statbuf;
- FILE *file = NULL;
- int fd, ret;
-
- if (!write && ((stat(filename, &statbuf) < 0) ||
- ((statbuf.st_mode & S_IFMT) != S_IFREG))) {
- UCI_THROW(ctx, UCI_ERR_NOTFOUND);
- }
-
- fd = open(filename, (write ? O_RDWR | O_CREAT : O_RDONLY));
- if (fd <= 0)
- goto error;
-
- if (flock(fd, (write ? LOCK_EX : LOCK_SH)) < 0)
- goto error;
-
- if (write && (pos == SEEK_SET))
- ret = ftruncate(fd, 0);
- else
- ret = lseek(fd, 0, pos);
-
- if (ret < 0)
- goto error;
-
- file = fdopen(fd, (write ? "w" : "r"));
- if (file)
- goto done;
-
-error:
- UCI_THROW(ctx, UCI_ERR_IO);
-done:
- return file;
-}
-static void uci_close_stream(FILE *stream)
+static char *uci_config_path(struct uci_context *ctx, const char *name)
{
- int fd;
-
- if (!stream)
- return;
-
- fd = fileno(stream);
- flock(fd, LOCK_UN);
- fclose(stream);
-}
-
-static void uci_parse_history_line(struct uci_context *ctx, struct uci_package *p, char *buf)
-{
- bool delete = false;
- char *package = NULL;
- char *section = NULL;
- char *option = NULL;
- char *value = NULL;
-
- if (buf[0] == '-') {
- delete = true;
- buf++;
- }
-
- UCI_INTERNAL(uci_parse_tuple, ctx, buf, &package, §ion, &option, &value);
- if (!package || !section || (!delete && !value))
- goto error;
- if (strcmp(package, p->e.name) != 0)
- goto error;
- if (!uci_validate_name(section))
- goto error;
- if (option && !uci_validate_name(option))
- goto error;
-
- if (delete)
- UCI_INTERNAL(uci_del, ctx, p, section, option);
- else
- UCI_INTERNAL(uci_set, ctx, p, section, option, value);
-
- return;
-error:
- UCI_THROW(ctx, UCI_ERR_PARSE);
-}
-
-static void uci_parse_history(struct uci_context *ctx, FILE *stream, struct uci_package *p)
-{
- struct uci_parse_context *pctx;
-
- /* make sure no memory from previous parse attempts is leaked */
- uci_file_cleanup(ctx);
-
- pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
- ctx->pctx = pctx;
- pctx->file = stream;
-
- rewind(stream);
- while (!feof(pctx->file)) {
- uci_getln(ctx, 0);
- if (!pctx->buf[0])
- continue;
- uci_parse_history_line(ctx, p, pctx->buf);
- }
-
- /* no error happened, we can get rid of the parser context now */
- uci_file_cleanup(ctx);
-}
-
-static void uci_load_history(struct uci_context *ctx, struct uci_package *p)
-{
- char *filename = NULL;
- FILE *f = NULL;
+ char *filename;
- if (!p->confdir)
- return;
- if ((asprintf(&filename, "%s/%s", UCI_SAVEDIR, p->e.name) < 0) || !filename)
- UCI_THROW(ctx, UCI_ERR_MEM);
+ UCI_ASSERT(ctx, uci_validate_name(name));
+ filename = uci_malloc(ctx, strlen(name) + strlen(ctx->confdir) + 2);
+ sprintf(filename, "%s/%s", ctx->confdir, name);
- UCI_TRAP_SAVE(ctx, done);
- f = uci_open_stream(ctx, filename, SEEK_SET, false);
- uci_parse_history(ctx, f, p);
- UCI_TRAP_RESTORE(ctx);
-done:
- if (filename)
- free(filename);
- uci_close_stream(f);
- ctx->errno = 0;
+ return filename;
}
int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
FILE *file = NULL;
UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, name != NULL);
switch (name[0]) {
case '.':
break;
default:
/* config in /etc/config */
- if (strchr(name, '/'))
- UCI_THROW(ctx, UCI_ERR_INVAL);
- filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
- sprintf(filename, UCI_CONFDIR "/%s", name);
+ filename = uci_config_path(ctx, name);
confdir = true;
break;
}
- file = uci_open_stream(ctx, filename, SEEK_SET, false);
+ file = uci_open_stream(ctx, filename, SEEK_SET, false, false);
ctx->errno = 0;
UCI_TRAP_SAVE(ctx, done);
- uci_import(ctx, file, name, package, true);
+ UCI_INTERNAL(uci_import, ctx, file, name, package, true);
UCI_TRAP_RESTORE(ctx);
if (*package) {
(*package)->path = filename;
(*package)->confdir = confdir;
- uci_load_history(ctx, *package);
+ uci_load_history(ctx, *package, false);
}
done:
return ctx->errno;
}
-int uci_save(struct uci_context *ctx, struct uci_package *p)
+int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
{
+ struct uci_package *p;
FILE *f = NULL;
- char *filename = NULL;
- struct uci_element *e, *tmp;
+ char *name = NULL;
+ char *path = NULL;
UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, p != NULL);
-
- /*
- * if the config file was outside of the /etc/config path,
- * don't save the history to a file, update the real file
- * directly
- */
- if (!p->confdir)
- return uci_commit(ctx, p);
-
- if (uci_list_empty(&p->history))
- return 0;
-
- if ((asprintf(&filename, "%s/%s", UCI_SAVEDIR, p->e.name) < 0) || !filename)
- UCI_THROW(ctx, UCI_ERR_MEM);
-
- ctx->errno = 0;
- UCI_TRAP_SAVE(ctx, done);
- f = uci_open_stream(ctx, filename, SEEK_END, true);
- UCI_TRAP_RESTORE(ctx);
-
- uci_foreach_element_safe(&p->history, tmp, e) {
- struct uci_history *h = uci_to_history(e);
-
- if (h->cmd == UCI_CMD_REMOVE)
- fprintf(f, "-");
-
- fprintf(f, "%s.%s", p->e.name, h->section);
- if (e->name)
- fprintf(f, ".%s", e->name);
+ UCI_ASSERT(ctx, package != NULL);
+ p = *package;
- if (h->cmd == UCI_CMD_REMOVE)
- fprintf(f, "\n");
+ UCI_ASSERT(ctx, p != NULL);
+ if (!p->path) {
+ if (overwrite)
+ p->path = uci_config_path(ctx, p->e.name);
else
- fprintf(f, "=%s\n", h->value);
- uci_list_del(&e->list);
+ UCI_THROW(ctx, UCI_ERR_INVAL);
}
-done:
- uci_close_stream(f);
- if (filename)
- free(filename);
- if (ctx->errno)
- UCI_THROW(ctx, ctx->errno);
-
- return 0;
-}
-int uci_commit(struct uci_context *ctx, struct uci_package *p)
-{
- FILE *f = NULL;
+ /* open the config file for writing now, so that it is locked */
+ f = uci_open_stream(ctx, p->path, SEEK_SET, true, true);
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, p != NULL);
- UCI_ASSERT(ctx, p->path != NULL);
+ /* flush unsaved changes and reload from history file */
+ UCI_TRAP_SAVE(ctx, done);
+ if (p->confdir) {
+ if (!overwrite) {
+ name = uci_strdup(ctx, p->e.name);
+ path = uci_strdup(ctx, p->path);
+ /* dump our own changes to the history file */
+ if (!uci_list_empty(&p->history))
+ UCI_INTERNAL(uci_save, ctx, p);
+
+ /*
+ * other processes might have modified the config
+ * as well. dump and reload
+ */
+ uci_free_package(&p);
+ uci_file_cleanup(ctx);
+ UCI_INTERNAL(uci_import, ctx, f, name, &p, true);
+
+ p->path = path;
+ p->confdir = true;
+ *package = p;
+
+ /* freed together with the uci_package */
+ path = NULL;
+
+ /* check for updated history, flush */
+ if (!uci_load_history(ctx, p, true))
+ goto done;
+ } else {
+ /* flush history */
+ if (!uci_load_history(ctx, NULL, true))
+ goto done;
+ }
+ }
- f = uci_open_stream(ctx, p->path, SEEK_SET, true);
+ rewind(f);
+ ftruncate(fileno(f), 0);
- UCI_TRAP_SAVE(ctx, done);
uci_export(ctx, f, p, false);
UCI_TRAP_RESTORE(ctx);
done:
+ if (name)
+ free(name);
+ if (path)
+ free(path);
uci_close_stream(f);
if (ctx->errno)
UCI_THROW(ctx, ctx->errno);
glob_t globbuf;
int size, i;
char *buf;
+ char *dir;
UCI_HANDLE_ERR(ctx);
- if (glob(UCI_CONFDIR "/*", GLOB_MARK, NULL, &globbuf) != 0)
+ dir = uci_malloc(ctx, strlen(ctx->confdir) + 1 + sizeof("/*"));
+ sprintf(dir, "%s/*", ctx->confdir);
+ if (glob(dir, GLOB_MARK, NULL, &globbuf) != 0)
UCI_THROW(ctx, UCI_ERR_NOTFOUND);
size = sizeof(char *) * (globbuf.gl_pathc + 1);
buf += strlen(buf) + 1;
}
*list = configs;
+ free(dir);
return 0;
}
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