diff options
Diffstat (limited to 'log/logread.c')
| -rw-r--r-- | log/logread.c | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/log/logread.c b/log/logread.c new file mode 100644 index 0000000..e8749f8 --- /dev/null +++ b/log/logread.c @@ -0,0 +1,369 @@ +/* + * 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 <sys/types.h> +#include <sys/stat.h> + +#include <fcntl.h> +#include <time.h> +#include <stdio.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/socket.h> + +#define SYSLOG_NAMES +#include <syslog.h> + +#include <libubox/blobmsg_json.h> +#include <libubox/usock.h> +#include <libubox/uloop.h> +#include "libubus.h" +#include "syslog.h" + +enum { + LOG_STDOUT, + LOG_FILE, + LOG_NET, +}; + +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 }, +}; + +static struct ubus_subscriber log_event; +static struct uloop_timeout retry; +static struct uloop_fd sender; +static const char *log_file, *log_ip, *log_port, *log_prefix, *pid_file, *hostname; +static int log_type = LOG_STDOUT; +static int log_size, log_udp; + +static const char* getcodetext(int value, CODE *codetable) { + CODE *i; + + if (value >= 0) + for (i = codetable; i->c_val != -1; i++) + if (i->c_val == value) + return (i->c_name); + return "<unknown>"; +}; + +static void log_handle_reconnect(struct uloop_timeout *timeout) +{ + sender.fd = usock((log_udp) ? (USOCK_UDP) : (USOCK_TCP), log_ip, log_port); + if (sender.fd < 0) { + fprintf(stderr, "failed to connect: %s\n", strerror(errno)); + uloop_timeout_set(&retry, 1000); + } else { + uloop_fd_add(&sender, ULOOP_READ); + syslog(0, "Logread connected to %s:%s\n", log_ip, log_port); + } +} + +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 void log_handle_fd(struct uloop_fd *u, unsigned int events) +{ + if (u->eof) { + uloop_fd_delete(u); + close(sender.fd); + sender.fd = -1; + uloop_timeout_set(&retry, 1000); + } +} + +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]; + struct stat s; + char buf[512]; + uint32_t p; + char *str; + time_t t; + char *c; + + if (sender.fd < 0) + return 0; + + 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; + + if ((log_type == LOG_FILE) && log_size && (!stat(log_file, &s)) && (s.st_size > log_size)) { + char *old = malloc(strlen(log_file) + 5); + + close(sender.fd); + if (old) { + sprintf(old, "%s.old", log_file); + rename(log_file, old); + free(old); + } + sender.fd = open(log_file, O_CREAT | O_WRONLY | O_APPEND, 0600); + if (sender.fd < 0) { +// fprintf(stderr, "failed to open %s: %s\n", log_file, strerror(errno)); + exit(-1); + } + } + + t = blobmsg_get_u64(tb[LOG_TIME]) / 1000; + c = ctime(&t); + p = blobmsg_get_u32(tb[LOG_PRIO]); + c[strlen(c) - 1] = '\0'; + str = blobmsg_format_json(msg, true); + if (log_type == LOG_NET) { + int err; + + *buf = '\0'; + if (hostname) + snprintf(buf, sizeof(buf), "%s ", hostname); + if (log_prefix) { + strncat(buf, log_prefix, sizeof(buf)); + strncat(buf, ": ", sizeof(buf)); + } + if (blobmsg_get_u32(tb[LOG_SOURCE]) == SOURCE_KLOG) + strncat(buf, "kernel: ", sizeof(buf)); + strncat(buf, method, sizeof(buf)); + if (log_udp) + err = write(sender.fd, buf, strlen(buf)); + else + err = send(sender.fd, buf, strlen(buf), 0); + + if (err < 0) { + syslog(0, "failed to send log data to %s:%s via %s\n", + log_ip, log_port, (log_udp) ? ("udp") : ("tcp")); + uloop_fd_delete(&sender); + close(sender.fd); + sender.fd = -1; + uloop_timeout_set(&retry, 1000); + } + } else { + snprintf(buf, sizeof(buf), "%s %s.%s%s %s\n", + c, getcodetext(LOG_FAC(p) << 3, facilitynames), getcodetext(LOG_PRI(p), prioritynames), + (blobmsg_get_u32(tb[LOG_SOURCE])) ? ("") : (" kernel:"), + method); + write(sender.fd, buf, strlen(buf)); + } + + free(str); + if (log_type == LOG_FILE) + fsync(sender.fd); + + return 0; +} + +static void follow_log(struct ubus_context *ctx, int id) +{ + FILE *fp; + int ret; + + signal(SIGPIPE, SIG_IGN); + + if (pid_file) { + fp = fopen(pid_file, "w+"); + if (fp) { + fprintf(fp, "%d", getpid()); + fclose(fp); + } + } + + 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)); + + if (log_ip && log_port) { + openlog("logread", LOG_PID, LOG_DAEMON); + log_type = LOG_NET; + sender.cb = log_handle_fd; + retry.cb = log_handle_reconnect; + uloop_timeout_set(&retry, 1000); + } else if (log_file) { + log_type = LOG_FILE; + sender.fd = open(log_file, O_CREAT | O_WRONLY| O_APPEND, 0600); + if (sender.fd < 0) { + fprintf(stderr, "failed to open %s: %s\n", log_file, strerror(errno)); + exit(-1); + } + } else { + sender.fd = STDOUT_FILENO; + } + + 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]; + uint32_t p; + 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]); + p = blobmsg_get_u32(tb[LOG_PRIO]); + c = ctime(&t); + c[strlen(c) - 1] = '\0'; + + printf("%s %s.%s%s %s\n", + c, getcodetext(LOG_FAC(p) << 3, facilitynames), getcodetext(LOG_PRI(p), prioritynames), + (blobmsg_get_u32(tb[LOG_SOURCE])) ? ("") : (" 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" + " -r <server> <port> Stream message to a server\n" + " -F <file> Log file\n" + " -S <bytes> Log size\n" + " -p <file> PID file\n" + " -h <hostname> Add hostname to the message\n" + " -P <prefix> Prefix custom text to streamed messages\n" + " -f Follow log messages\n" + " -u Use UDP as the protocol\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, "ufcs:l:r:F:p:S:P:h:")) != -1) { + switch (ch) { + case 'u': + log_udp = 1; + break; + case 's': + ubus_socket = optarg; + break; + case 'r': + log_ip = optarg++; + log_port = argv[optind++]; + break; + case 'F': + log_file = optarg; + break; + case 'p': + pid_file = optarg; + break; + case 'P': + log_prefix = optarg; + break; + case 'f': + subscribe = 1; + break; + case 'l': + lines = atoi(optarg); + break; + case 'S': + log_size = atoi(optarg); + if (log_size < 1) + log_size = 1; + log_size *= 1024; + break; + case 'h': + hostname = optarg; + break; + default: + return usage(*argv); + } + } + + 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; +} |