On 06/08/2017 12:34 PM, Justin Mitchell wrote:
> Re-implement include file functionality as documented.
>
> Existing implementation had various issues, one of which was it allowed
> a subordinate file to inadvertently change which section the subsequent
> tags back in the master config file got assigned to.
>
> Signed-off-by: Justin Mitchell <jumitche@xxxxxxxxxx>
Committed... Thanks!
steved
>
>
>
> ---
> support/nfs/conffile.c | 78 ++++++++++++++++++++++++++++++++++++--------------
> 1 file changed, 56 insertions(+), 22 deletions(-)
>
> diff --git a/support/nfs/conffile.c b/support/nfs/conffile.c
> index 449ac1c..05e0a6f 100644
> --- a/support/nfs/conffile.c
> +++ b/support/nfs/conffile.c
> @@ -56,9 +56,11 @@
> #pragma GCC visibility push(hidden)
>
> static void conf_load_defaults(void);
> -static int conf_load(int trans, const char *path);
> +static char * conf_load(const char *path);
> static int conf_set(int , char *, char *, char *,
> char *, int , int );
> +static void conf_parse(int trans, char *buf,
> + char **section, char **subsection);
>
> struct conf_trans {
> TAILQ_ENTRY (conf_trans) link;
> @@ -202,7 +204,6 @@ conf_set_now(char *section, char *arg, char *tag,
> node->tag = strdup(tag);
> node->value = strdup(value);
> node->is_default = is_default;
> -
> LIST_INSERT_HEAD(&conf_bindings[conf_hash (section)], node, link);
> return 0;
> }
> @@ -365,22 +366,47 @@ conf_parse_line(int trans, char *line, int lineno, char **section, char **subsec
> return;
> }
>
> - /* XXX Perhaps should we not ignore errors? */
> - conf_set(trans, *section, *subsection, line, val, 0, 0);
> + if (strcasecmp(line, "include")==0) {
> + /* load and parse subordinate config files */
> + char * subconf = conf_load(val);
> + if (subconf == NULL) {
> + xlog_warn("config file error: line %d: "
> + "error loading included config", lineno);
> + return;
> + }
> +
> + /* copy the section data so the included file can inherit it
> + * without accidentally changing it for us */
> + char * inc_section = NULL;
> + char * inc_subsection = NULL;
> + if (*section != NULL) {
> + inc_section = strdup(*section);
> + if (*subsection != NULL)
> + inc_subsection = strdup(*subsection);
> + }
> +
> + conf_parse(trans, subconf, &inc_section, &inc_subsection);
> +
> + if (inc_section) free(inc_section);
> + if (inc_subsection) free(inc_subsection);
> + free(subconf);
> + } else {
> + /* XXX Perhaps should we not ignore errors? */
> + conf_set(trans, *section, *subsection, line, val, 0, 0);
> + }
> }
>
> /* Parse the mapped configuration file. */
> static void
> -conf_parse(int trans, char *buf, size_t sz)
> +conf_parse(int trans, char *buf, char **section, char **subsection)
> {
> char *cp = buf;
> - char *bufend = buf + sz;
> + char *bufend = NULL;
> char *line;
> - char *section = NULL;
> - char *subsection = NULL;
> int lineno = 0;
>
> line = cp;
> + bufend = buf + strlen(buf);
> while (cp < bufend) {
> if (*cp == '\n') {
> /* Check for escaped newlines. */
> @@ -389,7 +415,7 @@ conf_parse(int trans, char *buf, size_t sz)
> else {
> *cp = '\0';
> lineno++;
> - conf_parse_line(trans, line, lineno, §ion, &subsection);
> + conf_parse_line(trans, line, lineno, section, subsection);
> line = cp + 1;
> }
> }
> @@ -397,8 +423,6 @@ conf_parse(int trans, char *buf, size_t sz)
> }
> if (cp != line)
> xlog_warn("conf_parse: last line non-terminated, ignored.");
> - if (section) free(section);
> - if (subsection) free(subsection);
> }
>
> static void
> @@ -408,21 +432,21 @@ conf_load_defaults(void)
> return;
> }
>
> -static int
> -conf_load(int trans, const char *path)
> +static char *
> +conf_load(const char *path)
> {
> struct stat sb;
> if ((stat (path, &sb) == 0) || (errno != ENOENT)) {
> - char *new_conf_addr;
> + char *new_conf_addr = NULL;
> size_t sz = sb.st_size;
> int fd = open (path, O_RDONLY, 0);
>
> if (fd == -1) {
> xlog_warn("conf_reinit: open (\"%s\", O_RDONLY) failed", path);
> - return -1;
> + return NULL;
> }
>
> - new_conf_addr = malloc(sz);
> + new_conf_addr = malloc(sz+1);
> if (!new_conf_addr) {
> xlog_warn("conf_reinit: malloc (%lu) failed", (unsigned long)sz);
> goto fail;
> @@ -437,14 +461,13 @@ conf_load(int trans, const char *path)
> close(fd);
>
> /* XXX Should we not care about errors and rollback? */
> - conf_parse(trans, new_conf_addr, sz);
> - free(new_conf_addr);
> - return 0;
> + new_conf_addr[sz] = '\0';
> + return new_conf_addr;
> fail:
> close(fd);
> - free(new_conf_addr);
> + if (new_conf_addr) free(new_conf_addr);
> }
> - return -1;
> + return NULL;
> }
>
> /* remove and free up any existing config state */
> @@ -473,14 +496,25 @@ static void
> conf_reinit(const char *conf_file)
> {
> int trans;
> + char * conf_data;
>
> trans = conf_begin();
> - if (conf_load(trans, conf_file) < 0)
> + conf_data = conf_load(conf_file);
> +
> + if (conf_data == NULL)
> return;
>
> /* Load default configuration values. */
> conf_load_defaults();
>
> + /* Parse config contents into the transaction queue */
> + char *section = NULL;
> + char *subsection = NULL;
> + conf_parse(trans, conf_data, §ion, &subsection);
> + if (section) free(section);
> + if (subsection) free(subsection);
> + free(conf_data);
> +
> /* Free potential existing configuration. */
> conf_free_bindings();
>
>
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