trace-cmd: Add print helpers to show connections

Add helper functions trace_net_print_connection() and
trace_vsock_print_connection() to print the host/port or cid/port that
has connected.

Link: https://lore.kernel.org/linux-trace-devel/20220420152637.13105-8-rostedt@goodmis.org
Link: https://lore.kernel.org/linux-trace-devel/20220417184538.1044417-8-rostedt@goodmis.org

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

4 files changed, 62 insertions, 0 deletions

diff --git a/tracecmd/include/trace-local.h b/tracecmd/include/trace-local.h
index 77d531d5..8c595957 100644
--- a/tracecmd/include/trace-local.h
+++ b/tracecmd/include/trace-local.h
@@ -311,6 +311,7 @@ extern struct buffer_instance *first_instance;
 
 int trace_net_make(int port, enum port_type type);
 int trace_net_search(int start_port, int *sfd, enum port_type type);
+int trace_net_print_connection(int fd);
 
 struct buffer_instance *allocate_instance(const char *name);
 void add_instance(struct buffer_instance *instance, int cpu_count);
@@ -366,6 +367,7 @@ int get_vsocket_params(int fd, unsigned int *lcid, unsigned int *rcid);
 int trace_vsock_get_port(int sd, unsigned int *port);
 bool trace_vsock_can_splice_read(void);
 int trace_vsock_local_cid(void);
+int trace_vsock_print_connection(int fd);
 #else
 static inline int trace_vsock_open(unsigned int cid, unsigned int port)
 {
@@ -403,6 +405,10 @@ static inline int trace_vsock_local_cid(void)
 {
 	return -ENOTSUP;
 }
+static inline int trace_vsock_print_connection(int fd)
+{
+	return -1;
+}
 #endif /* VSOCK */
 
 /* No longer in event-utils.h */
diff --git a/tracecmd/trace-agent.c b/tracecmd/trace-agent.c
index 819ac016..59cecae7 100644
--- a/tracecmd/trace-agent.c
+++ b/tracecmd/trace-agent.c
@@ -109,6 +109,18 @@ static char *get_clock(int argc, char **argv)
 	return NULL;
 }
 
+static void trace_print_connection(int fd, bool network)
+{
+	int ret;
+
+	if (network)
+		ret = trace_net_print_connection(fd);
+	else
+		ret = trace_vsock_print_connection(fd);
+	if (ret < 0)
+		tracecmd_debug("Could not print connection fd:%d\n", fd);
+}
+
 static void agent_handle(int sd, int nr_cpus, int page_size, bool network)
 {
 	struct tracecmd_tsync_protos *tsync_protos = NULL;
@@ -273,6 +285,8 @@ static void agent_serve(unsigned int port, bool do_daemon, bool network)
 				continue;
 			die("accept");
 		}
+		if (tracecmd_get_debug())
+			trace_print_connection(cd, network);
 
 		if (handler_pid)
 			goto busy;
diff --git a/tracecmd/trace-listen.c b/tracecmd/trace-listen.c
index 3b446ace..b7be761d 100644
--- a/tracecmd/trace-listen.c
+++ b/tracecmd/trace-listen.c
@@ -756,6 +756,28 @@ static int do_fork(int cfd)
 	return 0;
 }
 
+int trace_net_print_connection(int fd)
+{
+	char host[NI_MAXHOST], service[NI_MAXSERV];
+	struct sockaddr_storage net_addr;
+	socklen_t addr_len;
+
+	addr_len = sizeof(net_addr);
+	if (getpeername(fd, (struct sockaddr *)&net_addr, &addr_len))
+		return -1;
+
+	if (getnameinfo((struct sockaddr *)&net_addr, addr_len,
+			host, NI_MAXHOST,
+			service, NI_MAXSERV, NI_NUMERICSERV))
+		return -1;
+
+	if (tracecmd_get_debug())
+		tracecmd_debug("Connected to %s:%s fd:%d\n", host, service, fd);
+	else
+		tracecmd_plog("Connected to %s:%s\n", host, service);
+	return 0;
+}
+
 static int do_connection(int cfd, struct sockaddr *addr,
 			  socklen_t addr_len)
 {
diff --git a/tracecmd/trace-vsock.c b/tracecmd/trace-vsock.c
index d18ecb45..39294e7a 100644
--- a/tracecmd/trace-vsock.c
+++ b/tracecmd/trace-vsock.c
@@ -94,6 +94,26 @@ int get_vsocket_params(int fd, unsigned int *lcid, unsigned int *rcid)
 	return 0;
 }
 
+int trace_vsock_print_connection(int fd)
+{
+	struct sockaddr_vm vm_addr;
+	socklen_t addr_len;
+	int cid, port;
+
+	addr_len = sizeof(vm_addr);
+	if (getpeername(fd, (struct sockaddr *)&vm_addr, &addr_len))
+		return -1;
+	if (vm_addr.svm_family != AF_VSOCK)
+		return -1;
+	cid = vm_addr.svm_cid;
+	port = vm_addr.svm_port;
+	if (tracecmd_get_debug())
+		tracecmd_debug("Connected to @%u:%u fd:%d\n", cid, port, fd);
+	else
+		tracecmd_plog("Connected to @%u:%u\n", cid, port);
+	return 0;
+}
+
 static int try_splice_read_vsock(void)
 {
 	int ret, sd, brass[2];