New osmo-gsmtap-logsend utility

This utility can be used to "pipe" stdin or some file as log lines
via GSMTAP logging.

Change-Id: Ida96e87d84e0c349c5069edc67fec1c3cf19d1ab

.gitignore

@@ -72,6 +72,7 @@ tests/*/*_test
 utils/osmo-arfcn
 utils/osmo-auc-gen
 utils/osmo-config-merge
+utils/osmo-gsmtap-logsend
 utils/osmo-sim-test
 utils/osmo-aka-verify
 

debian/libosmocore-utils.install

@@ -2,3 +2,4 @@ usr/bin/osmo-arfcn
 usr/bin/osmo-auc-gen
 usr/bin/osmo-aka-verify
 usr/bin/osmo-config-merge
+usr/bin/osmo-gsmtap-logsend

utils/Makefile.am

@@ -8,7 +8,7 @@ LDADD = $(top_builddir)/src/core/libosmocore.la $(top_builddir)/src/gsm/libosmog
 if ENABLE_UTILITIES
 EXTRA_DIST = conv_gen.py conv_codes_gsm.py
 
-bin_PROGRAMS += osmo-arfcn osmo-auc-gen osmo-config-merge osmo-aka-verify
+bin_PROGRAMS += osmo-arfcn osmo-auc-gen osmo-config-merge osmo-aka-verify osmo-gsmtap-logsend
 
 osmo_arfcn_SOURCES = osmo-arfcn.c
 
@@ -16,6 +16,8 @@ osmo_auc_gen_SOURCES = osmo-auc-gen.c
 
 osmo_aka_verify_SOURCES = osmo-aka-verify.c
 
+osmo_gsmtap_logsend_SOURCES = gsmtap-logsend.c
+
 osmo_config_merge_SOURCES = osmo-config-merge.c
 osmo_config_merge_LDADD = $(LDADD) $(TALLOC_LIBS)
 

utils/gsmtap-logsend.c

@@ -0,0 +1,139 @@
+/* Small program to read an input file / stdin and send each line via GSMTAP logging */
+/* (C) 2023 by Harald Welte <laforge@osmocom.org>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 <stdio.h>
+#include <errno.h>
+#include <sys/uio.h>
+#include <getopt.h>
+
+#include <osmocom/core/byteswap.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/core/gsmtap.h>
+#include <osmocom/core/gsmtap_util.h>
+
+static char *proc_name = "gsmtap-logsend";
+static char *subsys_name = "unknown";
+static char *dest_host = "localhost";
+static int dest_port = GSMTAP_UDP_PORT;
+
+static void help(void)
+{
+	printf("osmo-gsmtap-logsend Usage:\n"
+	       "\t[ -r DESTADDR ] [ -p PORTNR ] [ -n PROC_NAME ] [ -s SUBSYS ] [ INFILE ]\n"
+	       "\n"
+	       " -a  --remote-address HOSTNAME     Destination IP destination address (default: localhost)\n"
+	       " -p  --remote-port PORTNR          Destination UDP Port number (default: 4729)\n"
+	       " -n  --process-name PROC_NAME      Process name to include in GSMTAP LOG header\n"
+	       " -s  --subsys-name SUBSYS          Subsystem name to include in GSMTAP LOG header\n"
+	       " -h  --help                        This help message\n"
+	      );
+}
+
+int main(int argc, char **argv)
+{
+	char buf[1024];
+	int gsmtap_fd;
+	FILE *infile;
+	char *line;
+	int rc;
+
+	while (1) {
+		static const struct option long_options[] = {
+			{ "remote-address", 1, 0, 'a' },
+			{ "remote-port", 1, 0, 'p' },
+			{ "process-name", 1, 0, 'n' },
+			{ "subsys-name", 1, 0, 's' },
+			{ "help", 0, 0, 'h' },
+			{ 0, 0, 0, 0 }
+		};
+		int c, option_index;
+
+		c = getopt_long(argc, argv, "a:p:n:s:h", long_options, &option_index);
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 'a':
+			dest_host = optarg;
+			break;
+		case 'p':
+			dest_port = atoi(optarg);
+			break;
+		case 'n':
+			proc_name = optarg;
+			break;
+		case 's':
+			subsys_name = optarg;
+			break;
+		case 'h':
+			help();
+			exit(0);
+			break;
+		default:
+			help();
+			exit(1);
+		}
+	}
+
+	if (argc <= optind) {
+		infile = stdin;
+	} else {
+		infile = fopen(argv[optind], "r");
+		if (!infile) {
+			fprintf(stderr, "Unable to open %s: %s\n", argv[optind], strerror(errno));
+			exit(2);
+		}
+	}
+
+	gsmtap_fd = gsmtap_source_init_fd(dest_host, dest_port);
+	if (gsmtap_fd < 0) {
+		fprintf(stderr, "Unable to create GSMTAP soicket: %s\n", strerror(errno));
+		exit(2);
+	}
+
+	/* prepare all the data structures that don't change for each line */
+	struct {
+		struct gsmtap_hdr gsmtap;
+		struct gsmtap_osmocore_log_hdr log;
+	} __attribute__ ((packed)) hdr;
+	struct timeval tv;
+
+	memset(&hdr, 0, sizeof(hdr));
+	hdr.gsmtap.version = GSMTAP_VERSION;
+	hdr.gsmtap.hdr_len = sizeof(hdr.gsmtap)/4;
+	hdr.gsmtap.type = GSMTAP_TYPE_OSMOCORE_LOG;
+
+	OSMO_STRLCPY_ARRAY(hdr.log.proc_name, proc_name);
+	OSMO_STRLCPY_ARRAY(hdr.log.subsys, subsys_name);
+	hdr.log.level = LOGL_INFO;
+
+	while ((line = fgets(buf, sizeof(buf), infile))) {
+		struct iovec iov[2] = {
+			{ .iov_base = &hdr, .iov_len = sizeof(hdr) },
+			{ .iov_base = buf, .iov_len = strlen(line) + 1 },
+		};
+		osmo_gettimeofday(&tv, NULL);
+		hdr.log.ts.sec = osmo_htonl(tv.tv_sec);
+		hdr.log.ts.usec = osmo_htonl(tv.tv_usec);
+
+		rc = writev(gsmtap_fd, iov, ARRAY_SIZE(iov));
+		if (rc <= 0) {
+			fprintf(stderr, "Short write on GSMTAP socket: %d (%s)\n", rc, strerror(errno));
+			exit(1);
+		}
+	}
+}