--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/smpp-trx-sa/main.c	Thu Aug 03 21:13:41 2023 -0800
@@ -0,0 +1,88 @@
+/*
+ * This C file is the main module for smpp-trx-sa - a standalone bind_trx
+ * client (ESME role) that writes all incoming messages into a log file
+ * and also allows outgoing messages to be sent via a UNIX domain local
+ * socket (datagram).
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/errno.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <time.h>
+#include <unistd.h>
+
+extern int tcpsock, localsock;
+
+FILE *logF;
+time_t curtime;
+int init_done;
+
+main(argc, argv)
+	char **argv;
+{
+	struct sockaddr_in server_sin;
+	fd_set fds;
+	int max_fd, rc;
+
+	if (argc != 6) {
+		fprintf(stderr,
+	"usage: %s server-ip system-id password log-file socket-pathname\n",
+			argv[0]);
+		exit(1);
+	}
+	server_sin.sin_family = AF_INET;
+	server_sin.sin_addr.s_addr = inet_addr(argv[1]);
+	if (server_sin.sin_addr.s_addr == INADDR_NONE) {
+		fprintf(stderr, "error: invalid IP address argument \"%s\"\n",
+			argv[1]);
+		exit(1);
+	}
+	server_sin.sin_port = htons(2775);
+	if (strlen(argv[2]) > 15) {
+		fprintf(stderr, "error: system-id string is too long\n");
+		exit(1);
+	}
+	if (strlen(argv[3]) > 8) {
+		fprintf(stderr, "error: password string is too long\n");
+		exit(1);
+	}
+	logF = fopen(argv[4], "a");
+	if (!logF) {
+		perror(argv[4]);
+		exit(1);
+	}
+	create_local_socket(argv[5]);
+	max_fd = localsock;
+	open_tcp_conn(&server_sin);
+	if (tcpsock > max_fd)
+		max_fd = tcpsock;
+	time(&curtime);
+	send_bind_req(argv[2], argv[3]);
+	init_done = 1;
+	/* main select loop */
+	for (;;) {
+		FD_ZERO(&fds);
+		FD_SET(tcpsock, &fds);
+		FD_SET(localsock, &fds);
+		rc = select(max_fd+1, &fds, 0, 0, 0);
+		if (rc < 0) {
+			if (errno == EINTR)
+				continue;
+			perror("select");
+			log_fatal_error("select syscall error");
+			exit(1);
+		}
+		time(&curtime);
+		if (FD_ISSET(tcpsock, &fds))
+			tcpsock_select_handler();
+		if (FD_ISSET(localsock, &fds))
+			localsock_select_handler();
+		fflush(logF);
+	}
+}