diff options
Diffstat (limited to 'udev_rules.c')
| -rw-r--r-- | udev_rules.c | 155 |
1 files changed, 153 insertions, 2 deletions
diff --git a/udev_rules.c b/udev_rules.c index c416128b62..6ed67c2672 100644 --- a/udev_rules.c +++ b/udev_rules.c @@ -135,6 +135,129 @@ static int get_format_len(char **str) return -1; } +static int get_key(char **line, char **key, char **value) +{ + char *linepos; + char *temp; + + linepos = *line; + if (!linepos) + return -1; + + if (strchr(linepos, '\\')) { + dbg("escaped characters are not supported, skip"); + return -1; + } + + /* skip whitespace */ + while (isspace(linepos[0])) + linepos++; + + /* get the key */ + *key = linepos; + while (1) { + linepos++; + if (linepos[0] == '\0') + return -1; + if (isspace(linepos[0])) + break; + if (linepos[0] == '=') + break; + } + + /* terminate key */ + linepos[0] = '\0'; + linepos++; + + /* skip whitespace */ + while (isspace(linepos[0])) + linepos++; + + /* get the value*/ + if (linepos[0] == '\0') + return -1; + + if (linepos[0] == '"') { + linepos++; + temp = strchr(linepos, '"'); + if (!temp) + return -1; + temp[0] = '\0'; + } else if (linepos[0] == '\'') { + linepos++; + temp = strchr(linepos, '\''); + if (!temp) + return -1; + temp[0] = '\0'; + } else { + temp = linepos; + while (temp[0] && !isspace(temp[0])) + temp++; + temp[0] = '\0'; + } + *value = linepos; + + return 0; +} + +static int import_file_into_env(const char *filename) +{ + char line[LINE_SIZE]; + char *bufline; + char *linepos; + char *variable; + char *value; + char *buf; + size_t bufsize; + size_t cur; + size_t count; + int lineno; + int retval = 0; + + if (file_map(filename, &buf, &bufsize) != 0) { + err("can't open '%s'", filename); + return -1; + } + + /* loop through the whole file */ + lineno = 0; + cur = 0; + while (cur < bufsize) { + count = buf_get_line(buf, bufsize, cur); + bufline = &buf[cur]; + cur += count+1; + lineno++; + + if (count >= sizeof(line)) { + err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno); + continue; + } + + /* eat the whitespace */ + while ((count > 0) && isspace(bufline[0])) { + bufline++; + count--; + } + if (count == 0) + continue; + + /* see if this is a comment */ + if (bufline[0] == COMMENT_CHARACTER) + continue; + + strlcpy(line, bufline, count+1); + + linepos = line; + if (get_key(&linepos, &variable, &value) == 0) { + dbg("import %s=%s", variable, value); + setenv(variable, value, 0); + } + } + + file_unmap(buf, bufsize); + return retval; +} + /** Finds the lowest positive N such that <name>N isn't present in * $(udevroot) either as a file or a symlink. * @@ -198,7 +321,7 @@ static void apply_format(struct udevice *udev, char *string, size_t maxsize, { char temp[PATH_SIZE]; char temp2[PATH_SIZE]; - char *head, *tail, *cpos, *attr, *rest; + char *head, *tail, *pos, *cpos, *attr, *rest; int len; int i; unsigned int next_free_number; @@ -218,6 +341,7 @@ static void apply_format(struct udevice *udev, char *string, size_t maxsize, SUBST_TEMP_NODE, SUBST_ROOT, SUBST_MODALIAS, + SUBST_ENV, }; static const struct subst_map { char *name; @@ -237,6 +361,7 @@ static void apply_format(struct udevice *udev, char *string, size_t maxsize, { .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE }, { .name = "root", .fmt = 'r', .type = SUBST_ROOT }, { .name = "modalias", .fmt = 'A', .type = SUBST_MODALIAS }, + { .name = "env", .fmt = 'E', .type = SUBST_ENV }, {} }; enum subst_type type; @@ -431,6 +556,17 @@ found: strlcat(string, temp2, maxsize); dbg("substitute MODALIAS '%s'", temp2); break; + case SUBST_ENV: + if (attr == NULL) { + dbg("missing attribute"); + break; + } + pos = getenv(attr); + if (pos == NULL) + break; + strlcat(string, pos, maxsize); + dbg("substitute env '%s=%s'", attr, pos); + break; default: err("unknown substitution type=%i", type); break; @@ -773,13 +909,28 @@ try_parent: dbg("look at sysfs_device->bus_id='%s'", parent_device->bus_id); } + if (rule->import_operation != KEY_OP_UNSET) { + char import[PATH_SIZE]; + + strlcpy(import, rule->import, sizeof(import)); + apply_format(udev, import, sizeof(import), class_dev, sysfs_device); + dbg("check for " KEY_IMPORT " import='%s", import); + if (import_file_into_env(import) == 0) { + dbg(KEY_IMPORT " file '%s' imported", rule->import); + if (rule->import_operation == KEY_OP_NOMATCH) + goto exit; + } else + goto exit; + dbg(KEY_IMPORT " key is true"); + } + /* execute external program */ if (rule->program_operation != KEY_OP_UNSET) { char program[PATH_SIZE]; - dbg("check " KEY_PROGRAM); strlcpy(program, rule->program, sizeof(program)); apply_format(udev, program, sizeof(program), class_dev, sysfs_device); + dbg("check for " KEY_PROGRAM " program='%s", program); if (execute_program_pipe(program, udev->subsystem, udev->program_result, sizeof(udev->program_result)) != 0) { dbg(KEY_PROGRAM " returned nonzero"); |