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| -rw-r--r-- | logread.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/logread.c b/logread.c new file mode 100644 index 0000000..b7f9ebe --- /dev/null +++ b/logread.c @@ -0,0 +1,199 @@ +/* + * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org> + * Copyright (C) 2013 John Crispin <blogic@openwrt.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 + * as published by the Free Software Foundation + * + * This program 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 General Public License for more details. + */ + +#include <time.h> +#include <unistd.h> +#include <stdio.h> + +#include <libubox/blobmsg_json.h> +#include <libubox/uloop.h> +#include "libubus.h" + +enum { + LOG_MSG, + LOG_ID, + LOG_PRIO, + LOG_SOURCE, + LOG_TIME, + __LOG_MAX +}; + +static const struct blobmsg_policy log_policy[] = { + [LOG_MSG] = { .name = "msg", .type = BLOBMSG_TYPE_STRING }, + [LOG_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 }, + [LOG_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 }, + [LOG_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_INT32 }, + [LOG_TIME] = { .name = "time", .type = BLOBMSG_TYPE_INT64 }, +}; + +enum { + WATCH_ID, + WATCH_COUNTER, + __WATCH_MAX +}; + +static struct ubus_subscriber log_event; + +static void log_handle_remove(struct ubus_context *ctx, struct ubus_subscriber *s, + uint32_t id) +{ + fprintf(stderr, "Object %08x went away\n", id); +} + +static int log_notify(struct ubus_context *ctx, struct ubus_object *obj, + struct ubus_request_data *req, const char *method, + struct blob_attr *msg) +{ + struct blob_attr *tb[__LOG_MAX]; + char *str; + time_t t; + char *c; + + blobmsg_parse(log_policy, ARRAY_SIZE(log_policy), tb, blob_data(msg), blob_len(msg)); + if (!tb[LOG_ID] || !tb[LOG_PRIO] || !tb[LOG_SOURCE] || !tb[LOG_TIME]) + return 1; + + t = blobmsg_get_u64(tb[LOG_TIME]) / 1000; + c = ctime(&t); + c[strlen(c) - 1] = '\0'; + str = blobmsg_format_json(msg, true); + printf("%s - %s: %s\n", + c, (blobmsg_get_u32(tb[LOG_SOURCE])) ? ("syslog") : ("kernel"), method); + free(str); + + return 0; +} + +static void follow_log(struct ubus_context *ctx, int id) +{ + int ret; + + uloop_init(); + ubus_add_uloop(ctx); + + log_event.remove_cb = log_handle_remove; + log_event.cb = log_notify; + ret = ubus_register_subscriber(ctx, &log_event); + if (ret) + fprintf(stderr, "Failed to add watch handler: %s\n", ubus_strerror(ret)); + + ret = ubus_subscribe(ctx, &log_event, id); + if (ret) + fprintf(stderr, "Failed to add watch handler: %s\n", ubus_strerror(ret)); + + uloop_run(); + ubus_free(ctx); + uloop_done(); +} + +enum { + READ_LINE, + __READ_MAX +}; + +static const struct blobmsg_policy read_policy[] = { + [READ_LINE] = { .name = "lines", .type = BLOBMSG_TYPE_ARRAY }, +}; + +static void read_cb(struct ubus_request *req, int type, struct blob_attr *msg) +{ + struct blob_attr *cur; + struct blob_attr *_tb[__READ_MAX]; + time_t t; + int rem; + + if (!msg) + return; + + blobmsg_parse(read_policy, ARRAY_SIZE(read_policy), _tb, blob_data(msg), blob_len(msg)); + if (!_tb[READ_LINE]) + return; + blobmsg_for_each_attr(cur, _tb[READ_LINE], rem) { + struct blob_attr *tb[__LOG_MAX]; + char *c; + + if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) + continue; + + blobmsg_parse(log_policy, ARRAY_SIZE(log_policy), tb, blobmsg_data(cur), blobmsg_data_len(cur)); + if (!tb[LOG_MSG] || !tb[LOG_ID] || !tb[LOG_PRIO] || !tb[LOG_SOURCE] || !tb[LOG_TIME]) + continue; + + t = blobmsg_get_u64(tb[LOG_TIME]) / 1000; + c = ctime(&t); + c[strlen(c) - 1] = '\0'; + printf("%s - %s: %s\n", + c, (blobmsg_get_u32(tb[LOG_SOURCE])) ? ("syslog") : ("kernel"), + blobmsg_get_string(tb[LOG_MSG])); + } +} + +static int usage(const char *prog) +{ + fprintf(stderr, "Usage: %s [options]\n" + "Options:\n" + " -s <path> Path to ubus socket\n" + " -l <count> Got only the last 'count' messages\n" + " -f Follow log messages\n" + "\n", prog); + return 1; +} + +int main(int argc, char **argv) +{ + struct ubus_context *ctx; + uint32_t id; + const char *ubus_socket = NULL; + int ch, ret, subscribe = 0, lines = 0; + static struct blob_buf b; + + while ((ch = getopt(argc, argv, "fs:l:")) != -1) { + switch (ch) { + case 's': + ubus_socket = optarg; + break; + case 'f': + subscribe = 1; + break; + case 'l': + lines = atoi(optarg); + break; + default: + usage(*argv); + break; + } + } + + ctx = ubus_connect(ubus_socket); + if (!ctx) { + fprintf(stderr, "Failed to connect to ubus\n"); + return -1; + } + + ret = ubus_lookup_id(ctx, "log", &id); + if (ret) + fprintf(stderr, "Failed to find log object: %s\n", ubus_strerror(ret)); + + if (!subscribe || lines) { + blob_buf_init(&b, 0); + if (lines) + blobmsg_add_u32(&b, "lines", lines); + ubus_invoke(ctx, id, "read", b.head, read_cb, 0, 3000); + } + + if (subscribe) + follow_log(ctx, id); + + return 0; +} |