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src / c / udpmsg / udpmsg.c
@Andreas Jaggi Andreas Jaggi on 10 Aug 2006 3 KB Added udpmsg/udpmsgd (send messages via UDP)
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  1. /*
  2.  * udpmsg: send messages via UDP
  3.  */
  4.  
  5. /*
  6.  * Copyright (c) 2006 Andreas Jaggi <andreas.jaggi@waterwave.ch>
  7.  * All rights reserved.
  8.  * 
  9.  * Redistribution and use in source and binary forms, with or without
  10.  * modification, are permitted provided that the following conditions
  11.  * are met:
  12.  * 1. Redistributions of source code must retain the above copyright
  13.  *    notice, this list of conditions and the following disclaimer.
  14.  * 2. Redistributions in binary form must reproduce the above copyright
  15.  *    notice, this list of conditions and the following disclaimer in the
  16.  *    documentation and/or other materials provided with the distribution.
  17.  * 3. The name of the author may not be used to endorse or promote products
  18.  *    derived from this software without specific prior written permission.
  19.  * 
  20.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  21.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  22.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  23.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  24.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  29.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30.  */
  31.  
  32. #include <stdlib.h>
  33. #include <unistd.h>
  34. #include <errno.h>
  35. #include <netinet/in.h>
  36. #include <arpa/inet.h>
  37.  
  38. #include "udpmsg.h"
  39.  
  40. const char usagemsg[] =
  41. 	"usage: udpmsg -i <IP> -m <message>\n"
  42. 	"\n"
  43. 	"arguments:\n"
  44. 	"    -i IP         send to host with address IP\n"
  45. 	"    -m message    message to send\n"
  46. 	" also: udpmsg -v    show version\n"
  47. 	"       udpmsg -h    display this help\n"
  48. 	"       udpmsg -l    display (BSD) license\n"
  49. 	;
  50.  
  51. const char versionmsg[] = "udpmsg 0.3\n";
  52.  
  53. void usage ( );
  54. void version ( );
  55.  
  56. int main ( int argc, char* argv[] ) {
  57. 	int sock;
  58. 	int tmp;
  59. 	in_addr_t remote_addr = 0;
  60. 	char* msg = NULL;
  61. 	struct sockaddr_in *destination = NULL;
  62.  
  63. 	while ( (tmp = getopt(argc, argv, "i:m:hlv")) != -1 ) {
  64. 		switch ( tmp ) {
  65. 			case 'h':
  66. 				usage();
  67. 				exit(0);
  68. 			case 'l':
  69. 				license();
  70. 				exit(0);
  71. 			case 'v':
  72. 				version();
  73. 				exit(0);
  74. 			case 'i':
  75. 				remote_addr = inet_addr(optarg);
  76. 				break;
  77. 			case 'm':
  78. 				msg = optarg;
  79. 				break;
  80. 		}
  81. 	}
  82.  
  83. 	if ( (remote_addr == 0) || (msg == NULL) ) {
  84. 		usage();
  85. 		exit(-1);
  86. 	}
  87.  
  88. 	sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
  89. 	if ( sock < 0 ) {
  90. 		showerror("socket");
  91. 		exit(-1);
  92. 	}
  93.  
  94. 	destination = alloca(sizeof(struct sockaddr_in));
  95.  
  96. 	destination->sin_family = AF_INET;
  97. 	destination->sin_addr.s_addr = remote_addr;
  98. 	destination->sin_port = UDPMSG_PORT;
  99.  
  100. 	tmp = sendto(sock, msg, strlen(msg)+1, 0, (struct sockaddr*)destination, sizeof(struct sockaddr_in));
  101. 	if ( tmp < 0 ) {
  102. 		showerror("sendto");
  103. 		exit(-1);
  104. 	}
  105.  
  106. 	tmp = close(sock);
  107. 	if ( tmp < 0 ) {
  108. 		showerror("close");
  109. 		exit(-1);
  110. 	}
  111.  
  112. 	exit(0);
  113. }
  114.  
  115. void usage ( ) {
  116. 	write(1, usagemsg, strlen(usagemsg));
  117. }
  118.  
  119. void version ( ) {
  120. 	write(1, versionmsg, strlen(versionmsg));
  121. }