X-Git-Url: http://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fpaths.c;h=0d414ebaac0833a075b0f65532734e1620e46649;hp=ef8a45f924c8fa658fd4c39330f40eaf485761b4;hb=e1f6ffb9ca9e35738385a3524ba46896a0b519e6;hpb=c62667e5c78ea212e5ac49244e9792954a1d8f71

diff --git a/discover/paths.c b/discover/paths.c
index ef8a45f..0d414eb 100644
--- a/discover/paths.c
+++ b/discover/paths.c
@@ -1,11 +1,15 @@
-#define _GNU_SOURCE
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
 
+#include <assert.h>
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 
 #include <talloc/talloc.h>
 #include <system/system.h>
+#include <process/process.h>
 #include <url/url.h>
 #include <log/log.h>
 
@@ -13,135 +17,20 @@
 
 #define DEVICE_MOUNT_BASE (LOCAL_STATE_DIR "/petitboot/mnt")
 
-struct mount_map {
-	char *dev, *mnt;
+struct load_task {
+	struct pb_url		*url;
+	struct process		*process;
+	struct load_url_result	*result;
+	bool			async;
+	load_url_complete	async_cb;
+	void			*async_data;
 };
 
-static struct mount_map *mount_map;
-static int mount_map_size;
-
-static int is_prefix(const char *str, const char *prefix)
-{
-	return !strncmp(str, prefix, strlen(prefix));
-}
-
-static int is_prefix_ignorecase(const char *str, const char *prefix)
-{
-	return !strncasecmp(str, prefix, strlen(prefix));
-}
-
 const char *mount_base(void)
 {
 	return DEVICE_MOUNT_BASE;
 }
 
-char *encode_label(void *alloc_ctx, const char *label)
-{
-	char *str, *c;
-	unsigned int i;
-
-	/* the label can be expanded by up to four times */
-	str = talloc_size(alloc_ctx, strlen(label) * 4 + 1);
-	c = str;
-
-	for (i = 0; i < strlen(label); i++) {
-
-		if (label[i] == '/' || label[i] == '\\') {
-			sprintf(c, "\\x%02x", label[i]);
-			c += 4;
-			continue;
-		}
-
-		*(c++) = label[i];
-	}
-
-	*c = '\0';
-
-	return str;
-}
-
-char *parse_device_path(void *alloc_ctx,
-		const char *dev_str, const char __attribute__((unused)) *cur_dev)
-{
-	char *dev, *enc;
-
-	if (is_prefix_ignorecase(dev_str, "uuid=")) {
-		dev = talloc_asprintf(alloc_ctx, "/dev/disk/by-uuid/%s",
-				dev_str + strlen("uuid="));
-		return dev;
-	}
-
-	if (is_prefix_ignorecase(dev_str, "label=")) {
-		enc = encode_label(NULL, dev_str + strlen("label="));
-		dev = talloc_asprintf(alloc_ctx, "/dev/disk/by-label/%s", enc);
-		talloc_free(enc);
-		return dev;
-	}
-
-	/* normalise '/dev/foo' to 'foo' for easy comparisons, we'll expand
-	 * back before returning.
-	 */
-	if (is_prefix(dev_str, "/dev/"))
-		dev_str += strlen("/dev/");
-
-	return join_paths(alloc_ctx, "/dev", dev_str);
-}
-
-const char *mountpoint_for_device(const char *dev)
-{
-	int i;
-
-	if (is_prefix(dev, "/dev/"))
-		dev += strlen("/dev/");
-
-	/* check existing entries in the map */
-	for (i = 0; i < mount_map_size; i++)
-		if (!strcmp(mount_map[i].dev, dev))
-			return mount_map[i].mnt;
-
-	/* no existing entry, create a new one */
-	i = mount_map_size++;
-	mount_map = talloc_realloc(NULL, mount_map,
-			struct mount_map, mount_map_size);
-
-	mount_map[i].dev = talloc_strdup(mount_map, dev);
-	mount_map[i].mnt = join_paths(mount_map, DEVICE_MOUNT_BASE, dev);
-	return mount_map[i].mnt;
-}
-
-char *resolve_path(void *alloc_ctx, const char *path, const char *current_dev)
-{
-	static const char s_file[] = "file://";
-	char *ret;
-	const char *devpath, *sep;
-
-	/* test for urls */
-
-	if (!strncasecmp(path, s_file, sizeof(s_file) - 1))
-		path += sizeof(s_file) - 1;
-	else if (strstr(path, "://"))
-		return talloc_strdup(alloc_ctx, path);
-
-	sep = strchr(path, ':');
-	if (!sep) {
-		devpath = mountpoint_for_device(current_dev);
-		ret = join_paths(alloc_ctx, devpath, path);
-	} else {
-		/* parse just the device name into dev */
-		char *tmp, *dev;
-		tmp = talloc_strndup(NULL, path, sep - path);
-		dev = parse_device_path(NULL, tmp, current_dev);
-
-		devpath = mountpoint_for_device(dev);
-		ret = join_paths(alloc_ctx, devpath, sep + 1);
-
-		talloc_free(dev);
-		talloc_free(tmp);
-	}
-
-	return ret;
-}
-
 char *join_paths(void *alloc_ctx, const char *a, const char *b)
 {
 	char *full_path;
@@ -159,172 +48,248 @@ char *join_paths(void *alloc_ctx, const char *a, const char *b)
 
 static char *local_name(void *ctx)
 {
-	char *tmp, *ret;
+	char *ret, tmp[] = "/tmp/pb-XXXXXX";
+	int fd;
 
-	tmp = tempnam(NULL, "pb-");
+	fd = mkstemp(tmp);
 
-	if (!tmp)
+	if (fd < 0)
 		return NULL;
 
+	close(fd);
+
 	ret = talloc_strdup(ctx, tmp);
-	free(tmp);
 
 	return ret;
 }
 
-/**
- * pb_load_nfs - Mounts the NFS export and returns the local file path.
- *
- * Returns the local file path in a talloc'ed character string on success,
- * or NULL on error.
- */
-static char *load_nfs(void *ctx, struct pb_url *url)
+static void load_url_result_cleanup_local(struct load_url_result *result)
 {
-	int result;
-	const char *argv[8];
-	const char **p;
-	char *local;
-	char *opts;
-
-	local = local_name(ctx);
-
-	if (!local)
-		return NULL;
-
-	result = pb_mkdir_recursive(local);
-
-	if (result)
-		goto fail;
-
-	opts = talloc_strdup(NULL, "ro,nolock,nodiratime");
+	if (result->cleanup_local)
+		unlink(result->local);
+}
 
-	if (url->port)
-		opts = talloc_asprintf_append(opts, ",port=%s", url->port);
+static void load_url_process_exit(struct process *process)
+{
+	struct load_task *task = process->data;
+	struct load_url_result *result;
+	load_url_complete cb;
+	void *data;
+
+	pb_debug("The download client '%s' [pid %d, url %s] exited, rc %d\n",
+			process->path, process->pid, task->url->full,
+			process->exit_status);
+
+	result = task->result;
+	data = task->async_data;
+	cb = task->async_cb;
+
+	if (result->status == LOAD_CANCELLED) {
+		load_url_result_cleanup_local(result);
+	} else if (process_exit_ok(process)) {
+		result->status = LOAD_OK;
+	} else {
+		result->status = LOAD_ERROR;
+		load_url_result_cleanup_local(result);
+	}
 
-	p = argv;
-	*p++ = pb_system_apps.mount;	/* 1 */
-	*p++ = "-t";			/* 2 */
-	*p++ = "nfs";			/* 3 */
-	*p++ = opts;			/* 4 */
-	*p++ = url->host;		/* 5 */
-	*p++ = url->dir;		/* 6 */
-	*p++ = local;			/* 7 */
-	*p++ = NULL;			/* 8 */
+	/* The load callback may well free the ctx, which was the
+	 * talloc parent of the task. Therefore, we want to do our cleanup
+	 * before invoking it
+	 */
+	process_release(process);
+	talloc_free(task);
+	result->task = NULL;
 
-	result = pb_run_cmd(argv, 1, 0);
+	cb(result, data);
+}
 
-	talloc_free(opts);
+static void load_process_to_local_file(struct load_task *task,
+		const char **argv, int argv_local_idx)
+{
+	int rc;
 
-	if (result)
-		goto fail;
+	task->result->local = local_name(task->result);
+	if (!task->result->local) {
+		task->result->status = LOAD_ERROR;
+		return;
+	}
+	task->result->cleanup_local = true;
 
-	local = talloc_asprintf_append(local,  "/%s", url->path);
-	pb_log("%s: local '%s'\n", __func__, local);
+	if (argv_local_idx)
+		argv[argv_local_idx] = task->result->local;
 
-	return local;
+	task->process->argv = argv;
+	task->process->path = argv[0];
 
-fail:
-	pb_rmdir_recursive("/", local);
-	talloc_free(local);
-	return NULL;
+	if (task->async) {
+		rc = process_run_async(task->process);
+		if (rc) {
+			process_release(task->process);
+			task->process = NULL;
+		}
+		task->result->status = rc ? LOAD_ERROR : LOAD_ASYNC;
+	} else {
+		rc = process_run_sync(task->process);
+		if (rc || !process_exit_ok(task->process))
+			task->result->status = LOAD_ERROR;
+		else
+			task->result->status = LOAD_OK;
+		process_release(task->process);
+		task->process = NULL;
+	}
 }
 
 /**
- * pb_load_sftp - Loads a remote file via sftp and returns the local file path.
- *
- * Returns the local file path in a talloc'ed character string on success,
- * or NULL on error.
+ * pb_load_nfs - Create a mountpoint, set the local file within that
+ * mountpoint, and run the appropriate mount command
  */
-static char *load_sftp(void *ctx, struct pb_url *url)
-{
-	int result;
-	const char *argv[4];
-	const char **p;
-	char *local;
 
-	local = local_name(ctx);
+static void load_nfs(struct load_task *task)
+{
+	char *mountpoint, *opts;
+	int rc;
+	const char *argv[] = {
+			pb_system_apps.mount,
+			"-t", "nfs",
+			NULL,			/* 3: opts */
+			task->url->host,
+			task->url->dir,
+			NULL,			/* 6: mountpoint */
+			NULL,
+	};
+
+	task->result->status = LOAD_ERROR;
+	mountpoint = local_name(task->result);
+	if (!mountpoint)
+		return;
+	task->result->cleanup_local = true;
+	argv[6] = mountpoint;
+
+	rc = pb_mkdir_recursive(mountpoint);
+	if (rc)
+		return;
 
-	if (!local)
-		return NULL;
+	opts = talloc_strdup(NULL, "ro,nolock,nodiratime");
+	argv[3] = opts;
 
-	p = argv;
-	*p++ = pb_system_apps.sftp;					/* 1 */
-	*p++ = talloc_asprintf(local, "%s:%s", url->host, url->path);	/* 2 */
-	*p++ = local;							/* 3 */
-	*p++ = NULL;							/* 4 */
+	if (task->url->port)
+		opts = talloc_asprintf_append(opts, ",port=%s",
+						task->url->port);
 
-	result = pb_run_cmd(argv, 1, 0);
+	task->result->local = talloc_asprintf(task->result, "%s/%s",
+							mountpoint,
+							task->url->path);
 
-	if (result)
-		goto fail;
+	task->process->path = pb_system_apps.mount;
+	task->process->argv = argv;
 
-	return local;
+	if (task->async) {
+		rc = process_run_async(task->process);
+		if (rc) {
+			process_release(task->process);
+			task->process = NULL;
+		}
+		task->result->status = rc ? LOAD_ERROR : LOAD_ASYNC;
+	} else {
+		rc = process_run_sync(task->process);
+		task->result->status = rc ? LOAD_ERROR : LOAD_OK;
+		process_release(task->process);
+		task->process = NULL;
+	}
 
-fail:
-	talloc_free(local);
-	return NULL;
+	talloc_free(opts);
 }
 
-/**
- * pb_load_tftp - Loads a remote file via tftp and returns the local file path.
- *
- * Returns the local file path in a talloc'ed character string on success,
- * or NULL on error.
- */
+static void load_sftp(struct load_task *task)
+{
+	const char *argv[] = {
+			pb_system_apps.sftp,
+			NULL,		/* 1: host:path */
+			NULL,		/* 2: local file */
+			NULL,
+	};
+
+	argv[1] = talloc_asprintf(task, "%s:%s",
+				task->url->host, task->url->path);
+	load_process_to_local_file(task, argv, 2);
+}
 
-static char *load_tftp(void *ctx, struct pb_url *url)
+static enum tftp_type check_tftp_type(void *ctx)
 {
-	int result;
-	const char *argv[10];
-	const char **p;
-	char *local;
+	const char *argv[] = { pb_system_apps.tftp, "-V", NULL };
+	struct process *process;
+	enum tftp_type type;
+
+	process = process_create(ctx);
+	process->path = pb_system_apps.tftp;
+	process->argv = argv;
+	process->keep_stdout = true;
+	process->add_stderr = true;
+	process_run_sync(process);
+
+	if (!process->stdout_buf || process->stdout_len == 0) {
+		pb_log("Can't check TFTP client type!\n");
+		type = TFTP_TYPE_BROKEN;
+
+	} else if (memmem(process->stdout_buf, process->stdout_len,
+				"tftp-hpa", strlen("tftp-hpa"))) {
+		pb_debug("Found TFTP client type: tftp-hpa\n");
+		type = TFTP_TYPE_HPA;
+
+	} else if (memmem(process->stdout_buf, process->stdout_len,
+				"BusyBox", strlen("BusyBox"))) {
+		pb_debug("Found TFTP client type: BusyBox tftp\n");
+		type = TFTP_TYPE_BUSYBOX;
 
-	local = local_name(ctx);
+	} else {
+		pb_log("Unknown TFTP client type!\n");
+		type = TFTP_TYPE_BROKEN;
+	}
 
-	if (!local)
-		return NULL;
+	process_release(process);
+	return type;
+}
 
-	/* first try busybox tftp args */
-
-	p = argv;
-	*p++ = pb_system_apps.tftp;	/* 1 */
-	*p++ = "-g";			/* 2 */
-	*p++ = "-l";			/* 3 */
-	*p++ = local;			/* 4 */
-	*p++ = "-r";			/* 5 */
-	*p++ = url->path;		/* 6 */
-	*p++ = url->host;		/* 7 */
-	if (url->port)
-		*p++ = url->port;	/* 8 */
-	*p++ = NULL;			/* 9 */
-
-	result = pb_run_cmd(argv, 1, 0);
-
-	if (!result)
-		return local;
-
-	/* next try tftp-hpa args */
-
-	p = argv;
-	*p++ = pb_system_apps.tftp;	/* 1 */
-	*p++ = "-m";			/* 2 */
-	*p++ = "binary";		/* 3 */
-	*p++ = url->host;		/* 4 */
-	if (url->port)
-		*p++ = url->port;	/* 5 */
-	*p++ = "-c";			/* 6 */
-	*p++ = "get";			/* 7 */
-	*p++ = url->path;		/* 8 */
-	*p++ = local;			/* 9 */
-	*p++ = NULL;			/* 10 */
-
-	result = pb_run_cmd(argv, 1, 0);
-
-	if (!result)
-		return local;
-
-	talloc_free(local);
-	return NULL;
+static void load_tftp(struct load_task *task)
+{
+	const char *port = "69";
+	const char *argv[10] = {
+		pb_system_apps.tftp,
+	};
+
+	if (task->url->port)
+		port = task->url->port;
+
+	if (tftp_type == TFTP_TYPE_UNKNOWN)
+		tftp_type = check_tftp_type(task);
+
+	if (tftp_type == TFTP_TYPE_BUSYBOX) {
+		argv[1] = "-g";
+		argv[2] = "-l";
+		argv[3] = NULL;	/* 3: local file */
+		argv[4] = "-r";
+		argv[5] = task->url->path;
+		argv[6] = task->url->host;
+		argv[7] = port;
+		argv[8] = NULL;
+
+		load_process_to_local_file(task, argv, 3);
+
+	} else if (tftp_type == TFTP_TYPE_HPA) {
+		argv[1] = "-m";
+		argv[2] = "binary";
+		argv[3] = task->url->host;
+		argv[4] = port;
+		argv[5] = "-c";
+		argv[6] = "get";
+		argv[7] = task->url->path;
+		argv[8] = NULL; /* 8: local file */
+		argv[9] = NULL;
+		load_process_to_local_file(task, argv, 8);
+
+	} else
+		task->result->status = LOAD_ERROR;
 }
 
 enum wget_flags {
@@ -339,94 +304,142 @@ enum wget_flags {
  * or NULL on error.
  */
 
-static char *load_wget(void *ctx, struct pb_url *url, enum wget_flags flags)
+static void load_wget(struct load_task *task, int flags)
 {
-	int result;
-	const char *argv[7];
-	const char **p;
-	char *local;
-
-	local = local_name(ctx);
-
-	if (!local)
-		return NULL;
+	const char *argv[] = {
+		pb_system_apps.wget,
+		"-O",
+		NULL, /* 2: local file */
+		NULL, /* 3 (optional): --quiet */
+		NULL, /* 4 (optional): --no-check-certificate */
+		NULL, /* 5: URL */
+		NULL,
+	};
+	int i;
 
-	p = argv;
-	*p++ = pb_system_apps.wget;			/* 1 */
+	i = 3;
 #if !defined(DEBUG)
-	*p++ = "--quiet";				/* 2 */
+	argv[i++] = "--quiet";
 #endif
-	*p++ = "-O";					/* 3 */
-	*p++ = local;					/* 4 */
-	*p++ = url->full;				/* 5 */
 	if (flags & wget_no_check_certificate)
-		*p++ = "--no-check-certificate";	/* 6 */
-	*p++ = NULL;					/* 7 */
+		argv[i++] = "--no-check-certificate";
 
-	result = pb_run_cmd(argv, 1, 0);
+	argv[i] = task->url->full;
 
-	if (result)
-		goto fail;
+	load_process_to_local_file(task, argv, 2);
+}
 
-	return local;
+/* Although we don't need to load anything for a local path (we just return
+ * the path from the file:// URL), the other load helpers will error-out on
+ * non-existant files. So, do the same here with an access() check on the local
+ * filename.
+ */
+static void load_local(struct load_task *task)
+{
+	int rc;
 
-fail:
-	talloc_free(local);
-	return NULL;
+	rc = access(task->url->path, F_OK);
+	if (rc) {
+		task->result->status = LOAD_ERROR;
+	} else {
+		task->result->local = talloc_strdup(task->result,
+						    task->url->path);
+		task->result->status = LOAD_OK;
+	}
 }
 
 /**
- * pb_load_file - Loads a (possibly) remote file and returns the local file
+ * load_url - Loads a (possibly) remote URL and returns the local file
  * path.
  * @ctx: The talloc context to associate with the returned string.
- * @remote: The remote file URL.
+ * @url: The remote file URL.
  * @tempfile: An optional variable pointer to be set when a temporary local
  *  file is created.
+ * @url_cb: An optional callback pointer if the caller wants to load url
+ *  asynchronously.
  *
  * Returns the local file path in a talloc'ed character string on success,
  * or NULL on error.
  */
 
-char *load_file(void *ctx, const char *remote, unsigned int *tempfile)
+struct load_url_result *load_url_async(void *ctx, struct pb_url *url,
+		load_url_complete async_cb, void *async_data)
 {
-	struct pb_url *url = pb_url_parse(ctx, remote);
-	char *local;
-	int tmp = 0;
+	struct load_url_result *result;
+	struct load_task *task;
 
 	if (!url)
 		return NULL;
 
+	task = talloc_zero(ctx, struct load_task);
+	task->url = url;
+	task->async = async_cb != NULL;
+	task->result = talloc_zero(ctx, struct load_url_result);
+	task->result->task = task;
+	task->process = process_create(task);
+	if (task->async) {
+		task->async_cb = async_cb;
+		task->async_data = async_data;
+		task->process->exit_cb = load_url_process_exit;
+		task->process->data = task;
+	}
+
 	switch (url->scheme) {
 	case pb_url_ftp:
 	case pb_url_http:
-		local = load_wget(ctx, url, 0);
-		tmp = !!local;
+		load_wget(task, 0);
 		break;
 	case pb_url_https:
-		local = load_wget(ctx, url, wget_no_check_certificate);
-		tmp = !!local;
+		load_wget(task, wget_no_check_certificate);
 		break;
 	case pb_url_nfs:
-		local = load_nfs(ctx, url);
-		tmp = !!local;
+		load_nfs(task);
 		break;
 	case pb_url_sftp:
-		local = load_sftp(ctx, url);
-		tmp = !!local;
+		load_sftp(task);
 		break;
 	case pb_url_tftp:
-		local = load_tftp(ctx, url);
-		tmp = !!local;
+		load_tftp(task);
 		break;
 	default:
-		local = talloc_strdup(ctx, url->full);
-		tmp = 0;
+		load_local(task);
 		break;
 	}
 
-	if (tempfile)
-		*tempfile = tmp;
+	result = task->result;
+	if (result->status == LOAD_ERROR) {
+		load_url_result_cleanup_local(task->result);
+		talloc_free(result);
+		talloc_free(task);
+		return NULL;
+	}
+
+	if (!task->async)
+		talloc_free(task);
+
+	return result;
+}
+
+struct load_url_result *load_url(void *ctx, struct pb_url *url)
+{
+	return load_url_async(ctx, url, NULL, NULL);
+}
+
+void load_url_async_cancel(struct load_url_result *res)
+{
+	struct load_task *task = res->task;
+
+	/* the completion callback may have already been called; this clears
+	 * res->task */
+	if (!task)
+		return;
+
+	if (res->status == LOAD_CANCELLED)
+		return;
+
+	assert(task->async);
+	assert(task->process);
 
-	talloc_free(url);
-	return local;
+	res->status = LOAD_CANCELLED;
+	process_stop_async(task->process);
 }