-#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>
#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;
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 {
* 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);
}
projects / petitboot / blobdiff