--- /dev/null +++ b/networking/netmsg.c @@ -0,0 +1,76 @@ +/* + * Copyright (C) 2006 Felix Fietkau + * + * This is free software, licensed under the GNU General Public License v2. + */ + +//config:config NETMSG +//config: bool "netmsg" +//config: default n +//config: help +//config: simple program for sending udp broadcast messages + +//applet:IF_NETMSG(APPLET(netmsg, BB_DIR_BIN, BB_SUID_REQUIRE)) + +//kbuild:lib-$(CONFIG_NETMSG) += netmsg.o + +//usage:#define netmsg_trivial_usage NOUSAGE_STR +//usage:#define netmsg_full_usage "" + +#include +#include +#include +#include +#include +#include +#include +#include "busybox.h" + +#ifndef CONFIG_NETMSG +int main(int argc, char **argv) +#else +int netmsg_main(int argc, char **argv) +#endif +{ + int s; + struct sockaddr_in addr; + int optval = 1; + unsigned char buf[1001]; + + if (argc != 3) { + fprintf(stderr, "usage: %s \"\"\n", argv[0]); + exit(1); + } + + if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { + perror("Opening socket"); + exit(1); + } + + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_addr.s_addr = inet_addr(argv[1]); + addr.sin_port = htons(0x1337); + + memset(buf, 0, 1001); + buf[0] = 0xde; + buf[1] = 0xad; + + strncpy(buf + 2, argv[2], 998); + + if (setsockopt (s, SOL_SOCKET, SO_BROADCAST, (caddr_t) &optval, sizeof (optval)) < 0) { + perror("setsockopt()"); + goto fail; + } + + if (sendto(s, buf, 1001, 0, (struct sockaddr *) &addr, sizeof(addr)) < 0) { + perror("sendto()"); + goto fail; + } + + return 0; + +fail: + close(s); + exit(1); +}