lib/log: Switch to pb_log_fn
[petitboot] / discover / boot.c
index ddb9e7dc367539343e09cb28d321388c5fecb452..7faec9fcf684027117283a4f9806f1db26be727b 100644 (file)
 
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <dirent.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/types.h>
+
+#include <log/log.h>
+#include <pb-protocol/pb-protocol.h>
+#include <process/process.h>
+#include <system/system.h>
+#include <talloc/talloc.h>
+#include <url/url.h>
+#include <util/util.h>
+#include <i18n/i18n.h>
+
+#include "device-handler.h"
 #include "boot.h"
+#include "paths.h"
+#include "resource.h"
+#include "platform.h"
+
+#include <security/security.h>
+
+static const char *boot_hook_dir = PKG_SYSCONF_DIR "/boot.d";
+enum {
+       BOOT_HOOK_EXIT_OK       = 0,
+       BOOT_HOOK_EXIT_UPDATE   = 2,
+};
+
+static void __attribute__((format(__printf__, 4, 5))) update_status(
+               boot_status_fn fn, void *arg, int type, char *fmt, ...)
+{
+       struct status status;
+       va_list ap;
+
+       va_start(ap, fmt);
+       status.message = talloc_vasprintf(NULL, fmt, ap);
+       va_end(ap);
+
+       status.type = type;
+       status.backlog = false;
+
+       pb_debug("boot status: [%d] %s\n", type, status.message);
+
+       fn(arg, &status);
+
+       talloc_free(status.message);
+}
+
+/**
+ * kexec_load - kexec load helper.
+ */
+static int kexec_load(struct boot_task *boot_task)
+{
+       struct process *process;
+       char *s_initrd = NULL;
+       char *s_args = NULL;
+       const char *argv[7];
+       char *s_dtb = NULL;
+       const char **p;
+       int result;
+
+
+       boot_task->local_initrd_override = NULL;
+       boot_task->local_dtb_override = NULL;
+       boot_task->local_image_override = NULL;
+
+       if ((result = validate_boot_files(boot_task))) {
+               if (result == KEXEC_LOAD_DECRYPTION_FALURE) {
+                       pb_log("%s: Aborting kexec due to"
+                               " decryption failure\n", __func__);
+               }
+               if (result == KEXEC_LOAD_SIGNATURE_FAILURE) {
+                       pb_log("%s: Aborting kexec due to signature"
+                               " verification failure\n", __func__);
+               }
+
+               goto abort_kexec;
+       }
+
+       const char* local_initrd = (boot_task->local_initrd_override) ?
+               boot_task->local_initrd_override : boot_task->local_initrd;
+       const char* local_dtb = (boot_task->local_dtb_override) ?
+               boot_task->local_dtb_override : boot_task->local_dtb;
+       const char* local_image = (boot_task->local_image_override) ?
+               boot_task->local_image_override : boot_task->local_image;
+
+       process = process_create(boot_task);
+       if (!process) {
+               pb_log_fn("failed to create process\n");
+               return -1;
+       }
+
+       process->path = pb_system_apps.kexec;
+       process->argv = argv;
+       process->keep_stdout = true;
+       process->add_stderr = true;
+
+       p = argv;
+       *p++ = pb_system_apps.kexec;    /* 1 */
+       *p++ = "-l";                    /* 2 */
+
+       if (local_initrd) {
+               s_initrd = talloc_asprintf(boot_task, "--initrd=%s",
+                               local_initrd);
+               assert(s_initrd);
+               *p++ = s_initrd;         /* 3 */
+       }
+
+       if (local_dtb) {
+               s_dtb = talloc_asprintf(boot_task, "--dtb=%s",
+                                               local_dtb);
+               assert(s_dtb);
+               *p++ = s_dtb;            /* 4 */
+       }
+
+       s_args = talloc_asprintf(boot_task, "--append=%s",
+                               boot_task->args ?: "\"\"");
+       assert(s_args);
+       *p++ = s_args;          /* 5 */
+
+       *p++ = local_image;             /* 6 */
+       *p++ = NULL;                    /* 7 */
+
+       result = process_run_sync(process);
+       if (result) {
+               pb_log_fn("failed to run process\n");
+               goto abort_kexec;
+       }
+
+       result = process->exit_status;
+
+       if (result) {
+               pb_log_fn("failed: (%d)\n", result);
+               update_status(boot_task->status_fn, boot_task->status_arg,
+                               STATUS_ERROR, "%s", process->stdout_buf);
+       }
+
+abort_kexec:
+       validate_boot_files_cleanup(boot_task);
+
+       return result;
+}
+
+/**
+ * kexec_reboot - Helper to boot the new kernel.
+ *
+ * Must only be called after a successful call to kexec_load().
+ */
+
+static int kexec_reboot(struct boot_task *task)
+{
+       int result;
+
+       /* First try running shutdown.  Init scripts should run 'exec -e' */
+       result = process_run_simple(task, pb_system_apps.shutdown, "-r",
+                       "now", NULL);
+
+       /* On error, force a kexec with the -e option */
+       if (result) {
+               result = process_run_simple(task, pb_system_apps.kexec,
+                                               "-e", NULL);
+       }
+
+       if (result)
+               pb_log_fn("failed: (%d)\n", result);
+
+       /* okay, kexec -e -f */
+       if (result) {
+               result = process_run_simple(task, pb_system_apps.kexec,
+                                               "-e", "-f", NULL);
+       }
+
+       if (result)
+               pb_log_fn("failed: (%d)\n", result);
+
+
+       return result;
+}
+
+static void boot_hook_update_param(void *ctx, struct boot_task *task,
+               const char *name, const char *value)
+{
+       struct p {
+               const char *name;
+               const char **p;
+       } *param, params[] = {
+               { "boot_image",         &task->local_image },
+               { "boot_initrd",        &task->local_initrd },
+               { "boot_dtb",           &task->local_dtb },
+               { "boot_args",          &task->args },
+               { NULL, NULL },
+       };
+
+       for (param = params; param->name; param++) {
+               if (strcmp(param->name, name))
+                       continue;
+
+               *param->p = talloc_strdup(ctx, value);
+               return;
+       }
+}
+
+static void boot_hook_update(struct boot_task *task, const char *hookname,
+               char *buf)
+{
+       char *line, *name, *val, *sep;
+       char *saveptr = NULL;
+
+       for (;; buf = NULL) {
+
+               line = strtok_r(buf, "\n", &saveptr);
+               if (!line)
+                       break;
+
+               sep = strchr(line, '=');
+               if (!sep)
+                       continue;
+
+               *sep = '\0';
+               name = line;
+               val = sep + 1;
+
+               boot_hook_update_param(task, task, name, val);
+
+               pb_log("boot hook %s specified %s=%s\n",
+                               hookname, name, val);
+       }
+}
+
+static void boot_hook_setenv(struct boot_task *task)
+{
+       unsetenv("boot_image");
+       unsetenv("boot_initrd");
+       unsetenv("boot_dtb");
+       unsetenv("boot_args");
+       unsetenv("boot_console");
+
+       setenv("boot_image", task->local_image, 1);
+       if (task->local_initrd)
+               setenv("boot_initrd", task->local_initrd, 1);
+       if (task->local_dtb)
+               setenv("boot_dtb", task->local_dtb, 1);
+       if (task->args)
+               setenv("boot_args", task->args, 1);
+       if (task->boot_console)
+               setenv("boot_console", task->boot_console, 1);
+}
+
+static int hook_filter(const struct dirent *dirent)
+{
+       return dirent->d_type == DT_REG || dirent->d_type == DT_LNK;
+}
+
+static int hook_cmp(const struct dirent **a, const struct dirent **b)
+{
+       return strcmp((*a)->d_name, (*b)->d_name);
+}
+
+static void run_boot_hooks(struct boot_task *task)
+{
+       struct dirent **hooks;
+       int i, n;
+
+       n = scandir(boot_hook_dir, &hooks, hook_filter, hook_cmp);
+       if (n < 1)
+               return;
+
+       update_status(task->status_fn, task->status_arg, STATUS_INFO,
+                       _("Running boot hooks"));
+
+       boot_hook_setenv(task);
+
+       for (i = 0; i < n; i++) {
+               const char *argv[2] = { NULL, NULL };
+               struct process *process;
+               char *path;
+               int rc;
 
-int boot(void *ctx, struct boot_option *opt, struct boot_command *cmd,
-               int dry_run)
+               path = join_paths(task, boot_hook_dir, hooks[i]->d_name);
+
+               if (access(path, X_OK)) {
+                       talloc_free(path);
+                       continue;
+               }
+
+               process = process_create(task);
+
+               argv[0] = path;
+               process->path = path;
+               process->argv = argv;
+               process->keep_stdout = true;
+
+               pb_log("running boot hook %s\n", hooks[i]->d_name);
+
+               rc = process_run_sync(process);
+               if (rc) {
+                       pb_log("boot hook exec failed!\n");
+
+               } else if (WIFEXITED(process->exit_status) &&
+                          WEXITSTATUS(process->exit_status)
+                               == BOOT_HOOK_EXIT_UPDATE) {
+                       /* if the hook returned with BOOT_HOOK_EXIT_UPDATE,
+                        * then we process stdout to look for updated params
+                        */
+                       boot_hook_update(task, hooks[i]->d_name,
+                                       process->stdout_buf);
+                       boot_hook_setenv(task);
+               }
+
+               process_release(process);
+               talloc_free(path);
+       }
+
+       free(hooks);
+}
+
+static bool load_pending(struct load_url_result *result)
+{
+       return !result || result->status == LOAD_ASYNC;
+}
+
+static int check_load(struct boot_task *task, const char *name,
+               struct load_url_result *result)
+{
+       if (!result)
+               return 0;
+
+       if (result->status != LOAD_ERROR) {
+               update_status(task->status_fn, task->status_arg,
+                               STATUS_ERROR,
+                               _("Loaded %s from %s"), name,
+                               pb_url_to_string(result->url));
+               return 0;
+       }
+
+       pb_log("Failed to load %s from %s\n", name,
+                       pb_url_to_string(result->url));
+       update_status(task->status_fn, task->status_arg,
+                       STATUS_ERROR,
+                       _("Couldn't load %s from %s"), name,
+                       pb_url_to_string(result->url));
+       return -1;
+}
+
+static void cleanup_load(struct load_url_result *result)
+{
+       if (!result)
+               return;
+       if (result->status != LOAD_OK)
+               return;
+       if (!result->cleanup_local)
+               return;
+       unlink(result->local);
+}
+
+static void cleanup_cancellations(struct boot_task *task,
+               struct load_url_result *cur_result)
+{
+       struct boot_resource *resource;
+       struct load_url_result *result;
+       bool pending = false;
+
+       list_for_each_entry(&task->resources, resource, list) {
+               result = resource->result;
+
+               /* Nothing to do if a load hasn't actually started yet */
+               if (!result)
+                       continue;
+
+               /* We need to cleanup and free any completed loads */
+               if (result == cur_result || result->status == LOAD_OK
+                               || result->status == LOAD_ERROR) {
+                       cleanup_load(result);
+               /* ... and cancel any pending loads, which we'll free in
+                * the completion callback */
+               } else if (result->status == LOAD_ASYNC) {
+                       load_url_async_cancel(result);
+                       pending = true;
+
+               /* if we're waiting for a cancellation, we still need to
+                * wait for the completion before freeing the boot task */
+               } else if (result->status == LOAD_CANCELLED) {
+                       pending = true;
+               }
+       }
+
+       if (!pending)
+               talloc_free(task);
+}
+
+static void boot_process(struct load_url_result *result, void *data)
+{
+       struct boot_task *task = data;
+       struct boot_resource *resource;
+       int rc = -1;
+
+       if (task->cancelled) {
+               cleanup_cancellations(task, result);
+               return;
+       }
+
+       list_for_each_entry(&task->resources, resource, list)
+               if (load_pending(resource->result))
+                       return;
+
+       list_for_each_entry(&task->resources, resource, list) {
+               if (check_load(task, resource->name, resource->result))
+                       goto no_load;
+               *resource->local_path = resource->result->local;
+       }
+
+       run_boot_hooks(task);
+
+       update_status(task->status_fn, task->status_arg, STATUS_INFO,
+                       _("Performing kexec load"));
+
+       rc = kexec_load(task);
+       pb_log_fn("kexec_load returned %d\n", rc);
+       if (rc == KEXEC_LOAD_DECRYPTION_FALURE) {
+               update_status(task->status_fn, task->status_arg,
+                               STATUS_ERROR, _("Decryption failed"));
+       }
+       else if (rc == KEXEC_LOAD_SIGNATURE_FAILURE) {
+               update_status(task->status_fn, task->status_arg,
+                               STATUS_ERROR,
+                               _("Signature verification failed"));
+       }
+       else if (rc == KEXEC_LOAD_SIG_SETUP_INVALID) {
+               update_status(task->status_fn, task->status_arg,
+                               STATUS_ERROR,
+                               _("Invalid signature configuration"));
+       }
+
+no_load:
+       list_for_each_entry(&task->resources, resource, list)
+               cleanup_load(resource->result);
+
+       if (!rc) {
+               update_status(task->status_fn, task->status_arg,
+                               STATUS_INFO, _("Performing kexec reboot"));
+
+               rc = kexec_reboot(task);
+               if (rc) {
+                       update_status(task->status_fn, task->status_arg,
+                                       STATUS_ERROR,
+                                       _("kexec reboot failed"));
+               }
+       } else {
+               pb_log("Failed to load all boot resources\n");
+       }
+}
+
+static int start_url_load(struct boot_task *task, struct boot_resource *res)
 {
-       /* todo: run kexec with options from opt & cmd */
-       (void)ctx;
-       (void)opt;
-       (void)cmd;
-       (void)dry_run;
+       if (!res)
+               return 0;
 
+       res->result = load_url_async(task, res->url, boot_process,
+                                task, NULL, task->status_arg);
+       if (!res->result) {
+               pb_log("Error starting load for %s at %s\n",
+                               res->name, pb_url_to_string(res->url));
+               update_status(task->status_fn, task->status_arg,
+                               STATUS_ERROR, _("Error loading %s"),
+                               res->name);
+               return -1;
+       }
        return 0;
 }
+
+static struct boot_resource *add_boot_resource(struct boot_task *task,
+               const char *name, struct pb_url *url,
+               const char **local_path)
+{
+       struct boot_resource *res;
+
+       if (!url)
+               return NULL;
+
+       res = talloc_zero(task, struct boot_resource);
+       if (!res)
+               return NULL;
+
+       res->name = talloc_strdup(res, name);
+       res->url = pb_url_copy(res, url);
+       res->local_path = local_path;
+
+       list_add(&task->resources, &res->list);
+       return res;
+}
+
+struct boot_task *boot(void *ctx, struct discover_boot_option *opt,
+               struct boot_command *cmd, int dry_run,
+               boot_status_fn status_fn, void *status_arg)
+{
+       struct pb_url *image = NULL, *initrd = NULL, *dtb = NULL;
+       struct pb_url *image_sig = NULL, *initrd_sig = NULL, *dtb_sig = NULL,
+               *cmdline_sig = NULL;
+       struct boot_resource *image_res, *initrd_res, *dtb_res, *tmp;
+       const struct config *config = config_get();
+       struct boot_task *boot_task;
+       const char *boot_desc;
+       int rc;
+       int lockdown_type;
+
+       if (opt && opt->option->name)
+               boot_desc = opt->option->name;
+       else if (cmd && cmd->boot_image_file)
+               boot_desc = cmd->boot_image_file;
+       else
+               boot_desc = _("(unknown)");
+
+       update_status(status_fn, status_arg, STATUS_INFO,
+                       _("Booting %s"), boot_desc);
+
+       if (cmd && cmd->boot_image_file) {
+               image = pb_url_parse(opt, cmd->boot_image_file);
+       } else if (opt && opt->boot_image) {
+               image = opt->boot_image->url;
+       } else {
+               pb_log_fn("no image specified\n");
+               update_status(status_fn, status_arg, STATUS_INFO,
+                               _("Boot failed: no image specified"));
+               return NULL;
+       }
+
+       if (cmd && cmd->initrd_file) {
+               initrd = pb_url_parse(opt, cmd->initrd_file);
+       } else if (opt && opt->initrd) {
+               initrd = opt->initrd->url;
+       }
+
+       if (cmd && cmd->dtb_file) {
+               dtb = pb_url_parse(opt, cmd->dtb_file);
+       } else if (opt && opt->dtb) {
+               dtb = opt->dtb->url;
+       }
+
+       if (opt && opt->proxy) {
+               setenv("http_proxy", opt->proxy, 1);
+               setenv("https_proxy", opt->proxy, 1);
+       }
+
+       boot_task = talloc_zero(ctx, struct boot_task);
+       boot_task->dry_run = dry_run;
+       boot_task->status_fn = status_fn;
+       boot_task->status_arg = status_arg;
+       list_init(&boot_task->resources);
+
+       lockdown_type = lockdown_status();
+       boot_task->verify_signature = (lockdown_type == PB_LOCKDOWN_SIGN);
+       boot_task->decrypt_files = (lockdown_type == PB_LOCKDOWN_DECRYPT);
+
+       if (cmd && cmd->boot_args) {
+               boot_task->args = talloc_strdup(boot_task, cmd->boot_args);
+       } else if (opt && opt->option->boot_args) {
+               boot_task->args = talloc_strdup(boot_task,
+                                               opt->option->boot_args);
+       } else {
+               boot_task->args = NULL;
+       }
+
+       if (cmd && cmd->console && !config->manual_console)
+               boot_task->boot_console = talloc_strdup(boot_task, cmd->console);
+       else
+               boot_task->boot_console = config ? config->boot_console : NULL;
+
+       if (boot_task->verify_signature || boot_task->decrypt_files) {
+               if (cmd && cmd->args_sig_file) {
+                       cmdline_sig = pb_url_parse(opt, cmd->args_sig_file);
+               } else if (opt && opt->args_sig_file) {
+                       cmdline_sig = opt->args_sig_file->url;
+               } else {
+                       pb_log("%s: no command line signature file"
+                               " specified\n", __func__);
+                       update_status(status_fn, status_arg, STATUS_INFO,
+                                       _("Boot failed: no command line"
+                                               " signature file specified"));
+                       talloc_free(boot_task);
+                       return NULL;
+               }
+       }
+
+       image_res = add_boot_resource(boot_task, _("kernel image"), image,
+                       &boot_task->local_image);
+       initrd_res = add_boot_resource(boot_task, _("initrd"), initrd,
+                       &boot_task->local_initrd);
+       dtb_res = add_boot_resource(boot_task, _("dtb"), dtb,
+                       &boot_task->local_dtb);
+
+       /* start async loads for boot resources */
+       rc = start_url_load(boot_task, image_res)
+         || start_url_load(boot_task, initrd_res)
+         || start_url_load(boot_task, dtb_res);
+
+       if (boot_task->verify_signature) {
+               /* Generate names of associated signature files and load */
+               if (image) {
+                       image_sig = get_signature_url(ctx, image);
+                       tmp = add_boot_resource(boot_task,
+                                       _("kernel image signature"), image_sig,
+                                       &boot_task->local_image_signature);
+                       rc |= start_url_load(boot_task, tmp);
+               }
+               if (initrd) {
+                       initrd_sig = get_signature_url(ctx, initrd);
+                       tmp = add_boot_resource(boot_task,
+                                       _("initrd signature"), initrd_sig,
+                                       &boot_task->local_initrd_signature);
+                       rc |= start_url_load(boot_task, tmp);
+               }
+               if (dtb) {
+                       dtb_sig = get_signature_url(ctx, dtb);
+                       tmp = add_boot_resource(boot_task,
+                                       _("dtb signature"), dtb_sig,
+                                       &boot_task->local_dtb_signature);
+                       rc |= start_url_load(boot_task, tmp);
+               }
+       }
+
+       if (boot_task->verify_signature || boot_task->decrypt_files) {
+               tmp = add_boot_resource(boot_task,
+                               _("kernel command line signature"), cmdline_sig,
+                               &boot_task->local_cmdline_signature);
+               rc |= start_url_load(boot_task, tmp);
+       }
+
+       /* If all URLs are local, we may be done. */
+       if (rc) {
+               /* Don't call boot_cancel() to preserve the status update */
+               boot_task->cancelled = true;
+               cleanup_cancellations(boot_task, NULL);
+               return NULL;
+       }
+
+       boot_process(NULL, boot_task);
+
+       return boot_task;
+}
+
+void boot_cancel(struct boot_task *task)
+{
+       task->cancelled = true;
+
+       update_status(task->status_fn, task->status_arg, STATUS_INFO,
+                       _("Boot cancelled"));
+
+       cleanup_cancellations(task, NULL);
+}