X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=udev_rules.c;h=400ebad9e33b6841302065576e528feed81707b4;hb=84654a89135a0044f1abc380b1bd5f8c29637120;hp=6ef320dfc72385983a1d2d6791dcfac87eaecde4;hpb=956cf79390e303925135663a858456dd0a26e6c6;p=elogind.git

diff --git a/udev_rules.c b/udev_rules.c
index 6ef320dfc..400ebad9e 100644
--- a/udev_rules.c
+++ b/udev_rules.c
@@ -27,12 +27,15 @@
 #include <errno.h>
 #include <syslog.h>
 #include <fnmatch.h>
+#include <sys/socket.h>
+#include <sys/un.h>
 #include <sys/wait.h>
 #include <sys/stat.h>
 
 #include "udev.h"
 #include "udev_rules.h"
 
+extern char **environ;
 
 /* extract possible {attr} and move str behind it */
 static char *get_format_attribute(char **str)
@@ -113,6 +116,219 @@ out:
 	return 0;
 }
 
+static int run_program(const char *command, const char *subsystem,
+		char *result, size_t ressize, size_t *reslen)
+{
+	int status;
+	int outpipe[2] = {-1, -1};
+	int errpipe[2] = {-1, -1};
+	pid_t pid;
+	char arg[PATH_SIZE];
+	char program[PATH_SIZE];
+	char *argv[(sizeof(arg) / 2) + 1];
+	int devnull;
+	int i;
+	int retval = 0;
+
+	/* build argv from comand */
+	strlcpy(arg, command, sizeof(arg));
+	i = 0;
+	if (strchr(arg, ' ') != NULL) {
+		char *pos = arg;
+
+		while (pos != NULL) {
+			if (pos[0] == '\'') {
+				/* don't separate if in apostrophes */
+				pos++;
+				argv[i] = strsep(&pos, "\'");
+				while (pos != NULL && pos[0] == ' ')
+					pos++;
+			} else {
+				argv[i] = strsep(&pos, " ");
+			}
+			dbg("arg[%i] '%s'", i, argv[i]);
+			i++;
+		}
+		argv[i] = NULL;
+	} else {
+		argv[0] = arg;
+		argv[1] = NULL;
+	}
+	info("'%s'", command);
+
+	/* prepare pipes from child to parent */
+	if (result != NULL || udev_log_priority >= LOG_INFO) {
+		if (pipe(outpipe) != 0) {
+			err("pipe failed: %s", strerror(errno));
+			return -1;
+		}
+	}
+	if (udev_log_priority >= LOG_INFO) {
+		if (pipe(errpipe) != 0) {
+			err("pipe failed: %s", strerror(errno));
+			return -1;
+		}
+	}
+
+	/* allow programs in /lib/udev called without the path */
+	if (strchr(argv[0], '/') == NULL) {
+		strlcpy(program, "/lib/udev/", sizeof(program));
+		strlcat(program, argv[0], sizeof(program));
+		argv[0] = program;
+	}
+
+	pid = fork();
+	switch(pid) {
+	case 0:
+		/* child closes parent ends of pipes */
+		if (outpipe[READ_END] > 0)
+			close(outpipe[READ_END]);
+		if (errpipe[READ_END] > 0)
+			close(errpipe[READ_END]);
+
+		/* discard child output or connect to pipe */
+		devnull = open("/dev/null", O_RDWR);
+		if (devnull > 0) {
+			dup2(devnull, STDIN_FILENO);
+			if (outpipe[WRITE_END] < 0)
+				dup2(devnull, STDOUT_FILENO);
+			if (errpipe[WRITE_END] < 0)
+				dup2(devnull, STDERR_FILENO);
+			close(devnull);
+		} else
+			err("open /dev/null failed: %s", strerror(errno));
+		if (outpipe[WRITE_END] > 0) {
+			dup2(outpipe[WRITE_END], STDOUT_FILENO);
+			close(outpipe[WRITE_END]);
+		}
+		if (errpipe[WRITE_END] > 0) {
+			dup2(errpipe[WRITE_END], STDERR_FILENO);
+			close(errpipe[WRITE_END]);
+		}
+		execv(argv[0], argv);
+		if (errno == ENOENT || errno == ENOTDIR) {
+			/* may be on a filesytem which is not mounted right now */
+			info("program '%s' not found", argv[0]);
+		} else {
+			/* other problems */
+			err("exec of program '%s' failed", argv[0]);
+		}
+		_exit(1);
+	case -1:
+		err("fork of '%s' failed: %s", argv[0], strerror(errno));
+		return -1;
+	default:
+		/* read from child if requested */
+		if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
+			ssize_t count;
+			size_t respos = 0;
+
+			/* parent closes child ends of pipes */
+			if (outpipe[WRITE_END] > 0)
+				close(outpipe[WRITE_END]);
+			if (errpipe[WRITE_END] > 0)
+				close(errpipe[WRITE_END]);
+
+			/* read child output */
+			while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
+				int fdcount;
+				fd_set readfds;
+
+				FD_ZERO(&readfds);
+				if (outpipe[READ_END] > 0)
+					FD_SET(outpipe[READ_END], &readfds);
+				if (errpipe[READ_END] > 0)
+					FD_SET(errpipe[READ_END], &readfds);
+				fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
+				if (fdcount < 0) {
+					if (errno == EINTR)
+						continue;
+					retval = -1;
+					break;
+				}
+
+				/* get stdout */
+				if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
+					char inbuf[1024];
+					char *pos;
+					char *line;
+
+					count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
+					if (count <= 0) {
+						close(outpipe[READ_END]);
+						outpipe[READ_END] = -1;
+						if (count < 0) {
+							err("stdin read failed: %s", strerror(errno));
+							retval = -1;
+						}
+						continue;
+					}
+					inbuf[count] = '\0';
+
+					/* store result for rule processing */
+					if (result) {
+						if (respos + count < ressize) {
+							memcpy(&result[respos], inbuf, count);
+							respos += count;
+						} else {
+							err("ressize %ld too short", (long)ressize);
+							retval = -1;
+						}
+					}
+					pos = inbuf;
+					while ((line = strsep(&pos, "\n")))
+						if (pos || line[0] != '\0')
+							info("'%s' (stdout) '%s'", argv[0], line);
+				}
+
+				/* get stderr */
+				if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
+					char errbuf[1024];
+					char *pos;
+					char *line;
+
+					count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
+					if (count <= 0) {
+						close(errpipe[READ_END]);
+						errpipe[READ_END] = -1;
+						if (count < 0)
+							err("stderr read failed: %s", strerror(errno));
+						continue;
+					}
+					errbuf[count] = '\0';
+					pos = errbuf;
+					while ((line = strsep(&pos, "\n")))
+						if (pos || line[0] != '\0')
+							info("'%s' (stderr) '%s'", argv[0], line);
+				}
+			}
+			if (outpipe[READ_END] > 0)
+				close(outpipe[READ_END]);
+			if (errpipe[READ_END] > 0)
+				close(errpipe[READ_END]);
+
+			/* return the childs stdout string */
+			if (result) {
+				result[respos] = '\0';
+				dbg("result='%s'", result);
+				if (reslen)
+					*reslen = respos;
+			}
+		}
+		waitpid(pid, &status, 0);
+		if (WIFEXITED(status)) {
+			info("'%s' returned with status %i", argv[0], WEXITSTATUS(status));
+			if (WEXITSTATUS(status) != 0)
+				retval = -1;
+		} else {
+			err("'%s' abnormal exit", argv[0]);
+			retval = -1;
+		}
+	}
+
+	return retval;
+}
+
 static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize)
 {
 	char line[LINE_SIZE];
@@ -190,7 +406,7 @@ static int import_program_into_env(struct udevice *udev, const char *program)
 	char result[2048];
 	size_t reslen;
 
-	if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen, (udev_log_priority >= LOG_INFO)) != 0)
+	if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen) != 0)
 		return -1;
 	return import_keys_into_env(udev, result, reslen);
 }
@@ -238,6 +454,64 @@ static int import_parent_into_env(struct udevice *udev, const char *filter)
 	return rc;
 }
 
+static int pass_env_to_socket(const char *sockname, const char *devpath, const char *action)
+{
+	int sock;
+	struct sockaddr_un saddr;
+	socklen_t addrlen;
+	char buf[2048];
+	size_t bufpos = 0;
+	int i;
+	ssize_t count;
+	int retval = 0;
+
+	dbg("pass environment to socket '%s'", sockname);
+	sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
+	memset(&saddr, 0x00, sizeof(struct sockaddr_un));
+	saddr.sun_family = AF_LOCAL;
+	/* abstract namespace only */
+	strcpy(&saddr.sun_path[1], sockname);
+	addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
+
+	bufpos = snprintf(buf, sizeof(buf)-1, "%s@%s", action, devpath);
+	bufpos++;
+	for (i = 0; environ[i] != NULL && bufpos < sizeof(buf); i++) {
+		bufpos += strlcpy(&buf[bufpos], environ[i], sizeof(buf) - bufpos-1);
+		bufpos++;
+	}
+
+	count = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, addrlen);
+	if (count < 0)
+		retval = -1;
+	info("passed %zi bytes to socket '%s', ", count, sockname);
+
+	close(sock);
+	return retval;
+}
+
+int udev_rules_run(struct udevice *udev)
+{
+	struct name_entry *name_loop;
+	int retval = 0;
+
+	dbg("executing run list");
+	list_for_each_entry(name_loop, &udev->run_list, node) {
+		if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0) {
+			pass_env_to_socket(&name_loop->name[strlen("socket:")], udev->dev->devpath, udev->action);
+		} else {
+			char program[PATH_SIZE];
+
+			strlcpy(program, name_loop->name, sizeof(program));
+			udev_rules_apply_format(udev, program, sizeof(program));
+			if (run_program(program, udev->dev->subsystem, NULL, 0, NULL) != 0)
+				if (!name_loop->ignore_error)
+					retval = -1;
+		}
+	}
+
+	return retval;
+}
+
 #define WAIT_LOOP_PER_SECOND		50
 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
 {
@@ -837,7 +1111,7 @@ try_parent:
 
 		strlcpy(program, key_val(rule, &rule->program), sizeof(program));
 		udev_rules_apply_format(udev, program, sizeof(program));
-		if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL, (udev_log_priority >= LOG_INFO)) != 0) {
+		if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL) != 0) {
 			dbg("PROGRAM is false");
 			udev->program_result[0] = '\0';
 			if (rule->program.operation != KEY_OP_NOMATCH)
@@ -847,9 +1121,12 @@ try_parent:
 
 			dbg("PROGRAM matches");
 			remove_trailing_chars(result, '\n');
-			count = replace_chars(result, ALLOWED_CHARS_INPUT);
-			if (count)
-				info("%i character(s) replaced" , count);
+			if (rule->string_escape == ESCAPE_UNSET ||
+			    rule->string_escape == ESCAPE_REPLACE) {
+				count = replace_chars(result, ALLOWED_CHARS_INPUT);
+				if (count > 0)
+					info("%i character(s) replaced" , count);
+			}
 			dbg("result is '%s'", result);
 			strlcpy(udev->program_result, result, sizeof(udev->program_result));
 			dbg("PROGRAM returned successful");
@@ -907,12 +1184,13 @@ try_parent:
 				unsetenv(key_name);
 				info("unset ENV '%s'", key_name);
 			} else {
-				char *key_value = name_list_key_add(&udev->env_list, key_name, temp_value);
+				struct name_entry *entry;
 
-				if (key_value == NULL)
+				entry = name_list_key_add(&udev->env_list, key_name, temp_value);
+				if (entry == NULL)
 					break;
-				putenv(key_value);
-				info("set ENV '%s'", key_value);
+				putenv(entry->name);
+				info("set ENV '%s'", entry->name);
 			}
 		}
 	}
@@ -1047,9 +1325,12 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 				/* allow  multiple symlinks separated by spaces */
 				strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
 				udev_rules_apply_format(udev, temp, sizeof(temp));
-				count = replace_chars(temp, ALLOWED_CHARS_FILE " ");
-				if (count)
-					info("%i character(s) replaced" , count);
+				if (rule->string_escape == ESCAPE_UNSET ||
+				    rule->string_escape == ESCAPE_REPLACE) {
+					count = replace_chars(temp, ALLOWED_CHARS_FILE " ");
+					if (count > 0)
+						info("%i character(s) replaced" , count);
+				}
 				dbg("rule applied, added symlink(s) '%s'", temp);
 				pos = temp;
 				while (isspace(pos[0]))
@@ -1079,9 +1360,12 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 				name_set = 1;
 				strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
 				udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
-				count = replace_chars(udev->name, ALLOWED_CHARS_FILE);
-				if (count)
-					info("%i character(s) replaced", count);
+				if (rule->string_escape == ESCAPE_UNSET ||
+				    rule->string_escape == ESCAPE_REPLACE) {
+					count = replace_chars(udev->name, ALLOWED_CHARS_FILE);
+					if (count > 0)
+						info("%i character(s) replaced", count);
+				}
 
 				info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name);
 				if (strcmp(udev->dev->subsystem, "net") != 0)
@@ -1090,6 +1374,8 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 			}
 
 			if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
+				struct name_entry *entry;
+
 				if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
 					udev->run_final = 1;
 				if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
@@ -1097,7 +1383,9 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 					name_list_cleanup(&udev->run_list);
 				}
 				dbg("add run '%s'", key_val(rule, &rule->run));
-				name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
+				entry = name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
+				if (rule->run_ignore_error)
+					entry->ignore_error = 1;
 			}
 
 			if (rule->last_rule) {
@@ -1155,13 +1443,17 @@ int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
 			}
 
 			if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
+				struct name_entry *entry;
+
 				if (rule->run.operation == KEY_OP_ASSIGN ||
 				    rule->run.operation == KEY_OP_ASSIGN_FINAL) {
 					info("reset run list");
 					name_list_cleanup(&udev->run_list);
 				}
 				dbg("add run '%s'", key_val(rule, &rule->run));
-				name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
+				entry = name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
+				if (rule->run_ignore_error)
+					entry->ignore_error = 1;
 				if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
 					break;
 			}