diff options
Diffstat (limited to 'src/journal/journal-gatewayd.c')
| -rw-r--r-- | src/journal/journal-gatewayd.c | 623 |
1 files changed, 623 insertions, 0 deletions
diff --git a/src/journal/journal-gatewayd.c b/src/journal/journal-gatewayd.c new file mode 100644 index 0000000000..b7acfba99f --- /dev/null +++ b/src/journal/journal-gatewayd.c @@ -0,0 +1,623 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2012 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <fcntl.h> + +#include <microhttpd.h> + +#include "log.h" +#include "util.h" +#include "sd-journal.h" +#include "sd-daemon.h" +#include "logs-show.h" +#include "virt.h" + +typedef struct RequestMeta { + sd_journal *journal; + + OutputMode mode; + + char *cursor; + int64_t n_skip; + uint64_t n_entries; + bool n_entries_set; + + FILE *tmp; + uint64_t delta, size; +} RequestMeta; + +static const char* const mime_types[_OUTPUT_MODE_MAX] = { + [OUTPUT_SHORT] = "text/plain", + [OUTPUT_JSON] = "application/json", + [OUTPUT_EXPORT] = "application/vnd.fdo.journal" +}; + +static RequestMeta *request_meta(void **connection_cls) { + RequestMeta *m; + + if (*connection_cls) + return *connection_cls; + + m = new0(RequestMeta, 1); + if (!m) + return NULL; + + *connection_cls = m; + return m; +} + +static void request_meta_free( + void *cls, + struct MHD_Connection *connection, + void **connection_cls, + enum MHD_RequestTerminationCode toe) { + + RequestMeta *m = *connection_cls; + + if (!m) + return; + + if (m->journal) + sd_journal_close(m->journal); + + if (m->tmp) + fclose(m->tmp); + + free(m->cursor); + free(m); +} + +static int open_journal(RequestMeta *m) { + assert(m); + + if (m->journal) + return 0; + + return sd_journal_open(&m->journal, SD_JOURNAL_LOCAL_ONLY|SD_JOURNAL_SYSTEM_ONLY); +} + + +static int respond_oom(struct MHD_Connection *connection) { + struct MHD_Response *response; + const char m[] = "Out of memory.\n"; + int ret; + + assert(connection); + + response = MHD_create_response_from_buffer(sizeof(m)-1, (char*) m, MHD_RESPMEM_PERSISTENT); + if (!response) + return MHD_NO; + + MHD_add_response_header(response, "Content-Type", "text/plain"); + ret = MHD_queue_response(connection, MHD_HTTP_SERVICE_UNAVAILABLE, response); + MHD_destroy_response(response); + + return ret; +} + +static int respond_error( + struct MHD_Connection *connection, + unsigned code, + const char *format, ...) { + + struct MHD_Response *response; + char *m; + int r; + va_list ap; + + assert(connection); + assert(format); + + va_start(ap, format); + r = vasprintf(&m, format, ap); + va_end(ap); + + if (r < 0) + return respond_oom(connection); + + response = MHD_create_response_from_buffer(strlen(m), m, MHD_RESPMEM_MUST_FREE); + if (!response) { + free(m); + return respond_oom(connection); + } + + MHD_add_response_header(response, "Content-Type", "text/plain"); + r = MHD_queue_response(connection, code, response); + MHD_destroy_response(response); + + return r; +} + +static ssize_t request_reader_entries( + void *cls, + uint64_t pos, + char *buf, + size_t max) { + + RequestMeta *m = cls; + int r; + size_t n, k; + + assert(m); + assert(buf); + assert(max > 0); + assert(pos >= m->delta); + + pos -= m->delta; + + while (pos >= m->size) { + off_t sz; + + /* End of this entry, so let's serialize the next + * one */ + + if (m->n_entries_set && + m->n_entries <= 0) + return MHD_CONTENT_READER_END_OF_STREAM; + + if (m->n_skip < 0) { + r = sd_journal_previous_skip(m->journal, (uint64_t) -m->n_skip); + + /* We couldn't seek this far backwards? Then + * let's try to look forward... */ + if (r == 0) + r = sd_journal_next(m->journal); + + } else if (m->n_skip > 0) + r = sd_journal_next_skip(m->journal, (uint64_t) m->n_skip + 1); + else + r = sd_journal_next(m->journal); + + if (r < 0) { + log_error("Failed to advance journal pointer: %s", strerror(-r)); + return MHD_CONTENT_READER_END_WITH_ERROR; + } else if (r == 0) + return MHD_CONTENT_READER_END_OF_STREAM; + + pos -= m->size; + m->delta += m->size; + + if (m->n_entries_set) + m->n_entries -= 1; + + m->n_skip = 0; + + if (m->tmp) + rewind(m->tmp); + else { + m->tmp = tmpfile(); + if (!m->tmp) { + log_error("Failed to create temporary file: %m"); + return MHD_CONTENT_READER_END_WITH_ERROR;; + } + } + + r = output_journal(m->tmp, m->journal, m->mode, 0, OUTPUT_FULL_WIDTH); + if (r < 0) { + log_error("Failed to serialize item: %s", strerror(-r)); + return MHD_CONTENT_READER_END_WITH_ERROR; + } + + sz = ftello(m->tmp); + if (sz == (off_t) -1) { + log_error("Failed to retrieve file position: %m"); + return MHD_CONTENT_READER_END_WITH_ERROR; + } + + m->size = (uint64_t) sz; + } + + if (fseeko(m->tmp, pos, SEEK_SET) < 0) { + log_error("Failed to seek to position: %m"); + return MHD_CONTENT_READER_END_WITH_ERROR; + } + + n = m->size - pos; + if (n > max) + n = max; + + errno = 0; + k = fread(buf, 1, n, m->tmp); + if (k != n) { + log_error("Failed to read from file: %s", errno ? strerror(errno) : "Premature EOF"); + return MHD_CONTENT_READER_END_WITH_ERROR; + } + + return (ssize_t) k; +} + +static int request_parse_accept( + RequestMeta *m, + struct MHD_Connection *connection) { + + const char *accept; + + assert(m); + assert(connection); + + accept = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, "Accept"); + if (!accept) + return 0; + + if (streq(accept, mime_types[OUTPUT_JSON])) + m->mode = OUTPUT_JSON; + else if (streq(accept, mime_types[OUTPUT_EXPORT])) + m->mode = OUTPUT_EXPORT; + else + m->mode = OUTPUT_SHORT; + + return 0; +} + +static int request_parse_range( + RequestMeta *m, + struct MHD_Connection *connection) { + + const char *range, *colon, *colon2; + int r; + + assert(m); + assert(connection); + + range = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, "Range"); + if (!range) + return 0; + + if (!startswith(range, "entries=")) + return 0; + + range += 8; + range += strspn(range, WHITESPACE); + + colon = strchr(range, ':'); + if (!colon) + m->cursor = strdup(range); + else { + const char *p; + + colon2 = strchr(colon + 1, ':'); + if (colon2) { + char *t; + + t = strndup(colon + 1, colon2 - colon - 1); + if (!t) + return -ENOMEM; + + r = safe_atoi64(t, &m->n_skip); + free(t); + if (r < 0) + return r; + } + + p = (colon2 ? colon2 : colon) + 1; + if (*p) { + r = safe_atou64(p, &m->n_entries); + if (r < 0) + return r; + + if (m->n_entries <= 0) + return -EINVAL; + + m->n_entries_set = true; + } + + m->cursor = strndup(range, colon - range); + } + + if (!m->cursor) + return -ENOMEM; + + m->cursor[strcspn(m->cursor, WHITESPACE)] = 0; + if (isempty(m->cursor)) { + free(m->cursor); + m->cursor = NULL; + } + + return 0; +} + +static int request_handler_entries( + struct MHD_Connection *connection, + void **connection_cls) { + + struct MHD_Response *response; + RequestMeta *m; + int r; + + assert(connection); + assert(connection_cls); + + m = request_meta(connection_cls); + if (!m) + return respond_oom(connection); + + r = open_journal(m); + if (r < 0) + return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %s\n", strerror(-r)); + + if (request_parse_accept(m, connection) < 0) + return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Accept header.\n"); + + if (request_parse_range(m, connection) < 0) + return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Range header.\n"); + + /* log_info("cursor = %s", m->cursor); */ + /* log_info("skip = %lli", m->n_skip); */ + /* if (!m->n_entries_set) */ + /* log_info("n_entries not set!"); */ + /* else */ + /* log_info("n_entries = %llu", m->n_entries); */ + + if (m->cursor) + r = sd_journal_seek_cursor(m->journal, m->cursor); + else if (m->n_skip >= 0) + r = sd_journal_seek_head(m->journal); + else if (m->n_skip < 0) + r = sd_journal_seek_tail(m->journal); + if (r < 0) + return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Failed to seek in journal.\n"); + + response = MHD_create_response_from_callback(MHD_SIZE_UNKNOWN, 4*1024, request_reader_entries, m, NULL); + if (!response) + return respond_oom(connection); + + MHD_add_response_header(response, "Content-Type", mime_types[m->mode]); + + r = MHD_queue_response(connection, MHD_HTTP_OK, response); + MHD_destroy_response(response); + + return r; +} + +static int request_handler_redirect( + struct MHD_Connection *connection, + const char *target) { + + char *page; + struct MHD_Response *response; + int ret; + + assert(connection); + assert(page); + + if (asprintf(&page, "<html><body>Please continue to the <a href=\"%s\">journal browser</a>.</body></html>", target) < 0) + return respond_oom(connection); + + response = MHD_create_response_from_buffer(strlen(page), page, MHD_RESPMEM_MUST_FREE); + if (!response) { + free(page); + return respond_oom(connection); + } + + MHD_add_response_header(response, "Content-Type", "text/html"); + MHD_add_response_header(response, "Location", target); + + ret = MHD_queue_response(connection, MHD_HTTP_MOVED_PERMANENTLY, response); + MHD_destroy_response(response); + + return ret; +} + +static int request_handler_file( + struct MHD_Connection *connection, + const char *path, + const char *mime_type) { + + struct MHD_Response *response; + int ret; + _cleanup_close_ int fd = -1; + struct stat st; + + assert(connection); + assert(path); + assert(mime_type); + + fd = open(path, O_RDONLY|O_CLOEXEC); + if (fd < 0) + return respond_error(connection, MHD_HTTP_NOT_FOUND, "Failed to open file %s: %m\n", path); + + if (fstat(fd, &st) < 0) + return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to stat file: %m\n"); + + response = MHD_create_response_from_fd_at_offset(st.st_size, fd, 0); + if (!response) + return respond_oom(connection); + + fd = -1; + + MHD_add_response_header(response, "Content-Type", mime_type); + + ret = MHD_queue_response(connection, MHD_HTTP_OK, response); + MHD_destroy_response(response); + + return ret; +} + +static int request_handler_machine( + struct MHD_Connection *connection, + void **connection_cls) { + + struct MHD_Response *response; + RequestMeta *m; + int r; + _cleanup_free_ char* hostname = NULL, *os_name = NULL; + uint64_t cutoff_from, cutoff_to, usage; + char *json; + sd_id128_t mid, bid; + const char *v = "bare"; + + assert(connection); + + m = request_meta(connection_cls); + if (!m) + return respond_oom(connection); + + r = open_journal(m); + if (r < 0) + return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %s\n", strerror(-r)); + + r = sd_id128_get_machine(&mid); + if (r < 0) + return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine machine ID: %s\n", strerror(-r)); + + r = sd_id128_get_boot(&bid); + if (r < 0) + return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine boot ID: %s\n", strerror(-r)); + + hostname = gethostname_malloc(); + if (!hostname) + return respond_oom(connection); + + r = sd_journal_get_usage(m->journal, &usage); + if (r < 0) + return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine disk usage: %s\n", strerror(-r)); + + r = sd_journal_get_cutoff_realtime_usec(m->journal, &cutoff_from, &cutoff_to); + if (r < 0) + return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine disk usage: %s\n", strerror(-r)); + + parse_env_file("/etc/os-release", NEWLINE, "PRETTY_NAME", &os_name, NULL); + + detect_virtualization(&v); + + r = asprintf(&json, + "{ \"machine_id\" : \"" SD_ID128_FORMAT_STR "\"," + "\"boot_id\" : \"" SD_ID128_FORMAT_STR "\"," + "\"hostname\" : \"%s\"," + "\"os_pretty_name\" : \"%s\"," + "\"virtualization\" : \"%s\"," + "\"usage\" : \"%llu\"," + "\"cutoff_from_realtime\" : \"%llu\"," + "\"cutoff_to_realtime\" : \"%llu\" }\n", + SD_ID128_FORMAT_VAL(mid), + SD_ID128_FORMAT_VAL(bid), + hostname_cleanup(hostname), + os_name ? os_name : "Linux", + v, + (unsigned long long) usage, + (unsigned long long) cutoff_from, + (unsigned long long) cutoff_to); + + if (r < 0) + return respond_oom(connection); + + response = MHD_create_response_from_buffer(strlen(json), json, MHD_RESPMEM_MUST_FREE); + if (!response) { + free(json); + return respond_oom(connection); + } + + MHD_add_response_header(response, "Content-Type", "application/json"); + r = MHD_queue_response(connection, MHD_HTTP_OK, response); + MHD_destroy_response(response); + + return r; +} + +static int request_handler( + void *cls, + struct MHD_Connection *connection, + const char *url, + const char *method, + const char *version, + const char *upload_data, + size_t *upload_data_size, + void **connection_cls) { + + assert(connection); + assert(url); + assert(method); + + if (!streq(method, "GET")) + return MHD_NO; + + if (streq(url, "/")) + return request_handler_redirect(connection, "/browse"); + + if (streq(url, "/entries")) + return request_handler_entries(connection, connection_cls); + + if (streq(url, "/browse")) + return request_handler_file(connection, DOCUMENT_ROOT "/browse.html", "text/html"); + + if (streq(url, "/machine")) + return request_handler_machine(connection, connection_cls); + + return respond_error(connection, MHD_HTTP_NOT_FOUND, "Not found.\n"); +} + +int main(int argc, char *argv[]) { + struct MHD_Daemon *daemon = NULL; + int r = EXIT_FAILURE, n; + + if (argc > 1) { + log_error("This program does not take arguments."); + goto finish; + } + + log_set_target(LOG_TARGET_KMSG); + log_parse_environment(); + log_open(); + + n = sd_listen_fds(1); + if (n < 0) { + log_error("Failed to determine passed sockets: %s", strerror(-n)); + goto finish; + } else if (n > 1) { + log_error("Can't listen on more than one socket."); + goto finish; + } else if (n > 0) { + daemon = MHD_start_daemon( + MHD_USE_THREAD_PER_CONNECTION|MHD_USE_POLL|MHD_USE_DEBUG, + 19531, + NULL, NULL, + request_handler, NULL, + MHD_OPTION_LISTEN_SOCKET, SD_LISTEN_FDS_START, + MHD_OPTION_NOTIFY_COMPLETED, request_meta_free, NULL, + MHD_OPTION_END); + } else { + daemon = MHD_start_daemon( + MHD_USE_DEBUG|MHD_USE_THREAD_PER_CONNECTION|MHD_USE_POLL, + 19531, + NULL, NULL, + request_handler, NULL, + MHD_OPTION_NOTIFY_COMPLETED, request_meta_free, NULL, + MHD_OPTION_END); + } + + if (!daemon) { + log_error("Failed to start daemon!"); + goto finish; + } + + pause(); + + r = EXIT_SUCCESS; + +finish: + if (daemon) + MHD_stop_daemon(daemon); + + return r; +} |