Log error on failed underscores(), moving it to shared/

Move underscores() to shared/. It's the same as alias_normalize(), but
it rather operates in place, with the same string being passed.

The difference now that it's in shared/ is that it's a non-logging
function.

This makes us a little bit more verbose: we don't accept partially
correct module and aliases names in kcmdline and in configuration files.
We log an error instead.

3 files changed, 49 insertions, 56 deletions

diff --git a/libkmod/libkmod-config.c b/libkmod/libkmod-config.c
index 3dbf6c2..9cdc411 100644
--- a/libkmod/libkmod-config.c
+++ b/libkmod/libkmod-config.c
@@ -111,37 +111,6 @@ const char * const *kmod_softdep_get_post(const struct kmod_list *l, unsigned in
 	return dep->post;
 }
 
-/*
- * Replace dashes with underscores.
- * Dashes inside character range patterns (e.g. [0-9]) are left unchanged.
- */
-static char *underscores(struct kmod_ctx *ctx, char *s)
-{
-	unsigned int i;
-
-	if (!s)
-		return NULL;
-
-	for (i = 0; s[i]; i++) {
-		switch (s[i]) {
-		case '-':
-			s[i] = '_';
-			break;
-
-		case ']':
-			INFO(ctx, "Unmatched bracket in %s\n", s);
-			break;
-
-		case '[':
-			i += strcspn(&s[i], "]");
-			if (!s[i])
-				INFO(ctx, "Unmatched bracket in %s\n", s);
-			break;
-		}
-	}
-	return s;
-}
-
 static int kmod_config_add_command(struct kmod_config *config,
 						const char *modname,
 						const char *command,
@@ -516,8 +485,11 @@ static void kcmdline_parse_result(struct kmod_config *config, char *modname,
 			kmod_config_add_blacklist(config, t);
 		}
 	} else {
-		kmod_config_add_options(config,
-				underscores(config->ctx, modname), param);
+		if (underscores(modname) < 0) {
+			ERR(config->ctx, "Ignoring bad option on kernel command line while parsing module name: '%s'\n",
+			    modname);
+		}
+		kmod_config_add_options(config, modname, param);
 	}
 }
 
@@ -609,62 +581,51 @@ static int kmod_config_parse(struct kmod_config *config, int fd,
 			char *alias = strtok_r(NULL, "\t ", &saveptr);
 			char *modname = strtok_r(NULL, "\t ", &saveptr);
 
-			if (alias == NULL || modname == NULL)
+			if (underscores(alias) < 0 || underscores(modname) < 0)
 				goto syntax_error;
 
-			kmod_config_add_alias(config,
-						underscores(ctx, alias),
-						underscores(ctx, modname));
+			kmod_config_add_alias(config, alias, modname);
 		} else if (streq(cmd, "blacklist")) {
 			char *modname = strtok_r(NULL, "\t ", &saveptr);
 
-			if (modname == NULL)
+			if (underscores(modname) < 0)
 				goto syntax_error;
 
-			kmod_config_add_blacklist(config,
-						underscores(ctx, modname));
+			kmod_config_add_blacklist(config, modname);
 		} else if (streq(cmd, "options")) {
 			char *modname = strtok_r(NULL, "\t ", &saveptr);
 			char *options = strtok_r(NULL, "\0", &saveptr);
 
-			if (modname == NULL || options == NULL)
+			if (underscores(modname) < 0 || options == NULL)
 				goto syntax_error;
 
-			kmod_config_add_options(config,
-						underscores(ctx, modname),
-						options);
+			kmod_config_add_options(config, modname, options);
 		} else if (streq(cmd, "install")) {
 			char *modname = strtok_r(NULL, "\t ", &saveptr);
 			char *installcmd = strtok_r(NULL, "\0", &saveptr);
 
-			if (modname == NULL || installcmd == NULL)
+			if (underscores(modname) < 0 || installcmd == NULL)
 				goto syntax_error;
 
-			kmod_config_add_command(config,
-					underscores(ctx, modname),
-					installcmd,
+			kmod_config_add_command(config, modname, installcmd,
 					cmd, &config->install_commands);
 		} else if (streq(cmd, "remove")) {
 			char *modname = strtok_r(NULL, "\t ", &saveptr);
 			char *removecmd = strtok_r(NULL, "\0", &saveptr);
 
-			if (modname == NULL || removecmd == NULL)
+			if (underscores(modname) < 0 || removecmd == NULL)
 				goto syntax_error;
 
-			kmod_config_add_command(config,
-					underscores(ctx, modname),
-					removecmd,
+			kmod_config_add_command(config, modname, removecmd,
 					cmd, &config->remove_commands);
 		} else if (streq(cmd, "softdep")) {
 			char *modname = strtok_r(NULL, "\t ", &saveptr);
 			char *softdeps = strtok_r(NULL, "\0", &saveptr);
 
-			if (modname == NULL || softdeps == NULL)
+			if (underscores(modname) < 0 || softdeps == NULL)
 				goto syntax_error;
 
-			kmod_config_add_softdep(config,
-					underscores(ctx, modname),
-					softdeps);
+			kmod_config_add_softdep(config, modname, softdeps);
 		} else if (streq(cmd, "include")
 				|| streq(cmd, "config")) {
 			ERR(ctx, "%s: command %s is deprecated and not parsed anymore\n",
diff --git a/shared/util.c b/shared/util.c
index 3902823..dac70ed 100644
--- a/shared/util.c
+++ b/shared/util.c
@@ -114,6 +114,37 @@ finish:
 	return 0;
 }
 
+/*
+ * Replace dashes with underscores.
+ * Dashes inside character range patterns (e.g. [0-9]) are left unchanged.
+ *
+ * For convenience, it returns error if @s is NULL
+ */
+int underscores(char *s)
+{
+	unsigned int i;
+
+	if (!s)
+		return -EINVAL;
+
+	for (i = 0; s[i]; i++) {
+		switch (s[i]) {
+		case '-':
+			s[i] = '_';
+			break;
+		case ']':
+			return -EINVAL;
+		case '[':
+			i += strcspn(&s[i], "]");
+			if (!s[i])
+				return -EINVAL;
+			break;
+		}
+	}
+
+	return 0;
+}
+
 char *modname_normalize(const char *modname, char buf[static PATH_MAX], size_t *len)
 {
 	size_t s;
diff --git a/shared/util.h b/shared/util.h
index ef3881a..e013d08 100644
--- a/shared/util.h
+++ b/shared/util.h
@@ -21,6 +21,7 @@ void *memdup(const void *p, size_t n) __attribute__((nonnull(1)));
 #define KMOD_EXTENSION_UNCOMPRESSED ".ko"
 
 int alias_normalize(const char *alias, char buf[static PATH_MAX], size_t *len) _must_check_ __attribute__((nonnull(1,2)));
+int underscores(char *s) _must_check_;
 char *modname_normalize(const char *modname, char buf[static PATH_MAX], size_t *len) __attribute__((nonnull(1, 2)));
 char *path_to_modname(const char *path, char buf[static PATH_MAX], size_t *len) __attribute__((nonnull(2)));
 bool path_ends_with_kmod_ext(const char *path, size_t len) __attribute__((nonnull(1)));