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annotate packages/net/tcpip/current/doc/sample_program.html @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents ced4577552cd
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1 <!doctype html public "-//w3c//dtd html 4.0 transitional//en">
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2 <html>
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3 <head>
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4 <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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5 <meta name="GENERATOR" content="Mozilla/4.7 [en] (X11; I; Linux 2.2.14 ppc) [Netscape]">
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6 </head>
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7 <body>
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8
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9 <center>
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10 <h1>
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11 Sample Networking Program</h1></center>
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12
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13 <p><br>This example is derived from the test program <tt>".../net/tcpip/v1_3_1/tests/ping_test.c"</tt>.
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14 <br>&nbsp;
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15 <blockquote><tt><font size=-1>//==========================================================================</font></tt>
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16 <br><tt><font size=-1>//</font></tt>
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17 <br><tt><font size=-1>//&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tests/ping_test.c</font></tt>
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18 <br><tt><font size=-1>//</font></tt>
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19 <br><tt><font size=-1>//&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Simple test of PING
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20 (ICMP) and networking support</font></tt>
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21 <br><tt><font size=-1>//</font></tt>
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22 <br><tt><font size=-1>//==========================================================================</font></tt>
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23 <br><tt><font size=-1>//####BSDCOPYRIGHTBEGIN####</font></tt>
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24 <br><tt><font size=-1>//</font></tt>
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25 <br><tt><font size=-1>// -------------------------------------------</font></tt>
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26 <br><tt><font size=-1>//</font></tt>
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27 <br><tt><font size=-1>// Portions of this software may have been derived
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28 from OpenBSD or other sources,</font></tt>
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29 <br><tt><font size=-1>// and are covered by the appropriate copyright disclaimers
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30 included herein.</font></tt>
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31 <br><tt><font size=-1>//</font></tt>
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32 <br><tt><font size=-1>// -------------------------------------------</font></tt>
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33 <br><tt><font size=-1>//</font></tt>
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34 <br><tt><font size=-1>//####BSDCOPYRIGHTEND####</font></tt>
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35 <br><tt><font size=-1>//==========================================================================</font></tt>
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36 <br><tt><font size=-1>//#####DESCRIPTIONBEGIN####</font></tt>
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37 <br><tt><font size=-1>//</font></tt>
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38 <br><tt><font size=-1>// Author(s):&nbsp;&nbsp;&nbsp; gthomas</font></tt>
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39 <br><tt><font size=-1>// Contributors: gthomas</font></tt>
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40 <br><tt><font size=-1>// Date:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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41 2000-01-10</font></tt>
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42 <br><tt><font size=-1>// Purpose:</font></tt>
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43 <br><tt><font size=-1>// Description:</font></tt>
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44 <br><tt><font size=-1>//</font></tt>
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45 <br><tt><font size=-1>//</font></tt>
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46 <br><tt><font size=-1>//####DESCRIPTIONEND####</font></tt>
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47 <br><tt><font size=-1>//</font></tt>
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48 <br><tt><font size=-1>//==========================================================================</font></tt><tt><font size=-1></font></tt>
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49 <p><tt><font size=-1>// PING test code</font></tt><b><tt><font size=-1></font></tt></b>
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50 <p><b><tt><font size=-1>#include &lt;network.h></font></tt></b></blockquote>
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51 This single include directive is all that is required to pick up the networking
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52 support, including complete configuration information.
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53 <blockquote><tt><font size=-1>#define STACK_SIZE CYGNUM_HAL_STACK_SIZE_TYPICAL</font></tt>
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54 <br><tt><font size=-1>static char stack[STACK_SIZE];</font></tt>
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55 <br><tt><font size=-1>static cyg_thread thread_data;</font></tt>
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56 <br><tt><font size=-1>static cyg_handle_t thread_handle;</font></tt><tt><font size=-1></font></tt>
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57 <p><tt><font size=-1>#define NUM_PINGS 16</font></tt>
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58 <br><tt><font size=-1>#define MAX_PACKET 4096</font></tt>
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59 <br><tt><font size=-1>static unsigned char pkt1[MAX_PACKET], pkt2[MAX_PACKET];</font></tt><tt><font size=-1></font></tt>
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60 <p><tt><font size=-1>#define UNIQUEID 0x1234</font></tt><tt><font size=-1></font></tt>
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61 <p><tt><font size=-1>void</font></tt>
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62 <br><tt><font size=-1>cyg_test_exit(void)</font></tt>
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63 <br><tt><font size=-1>{</font></tt>
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64 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; diag_printf("... Done\n");</font></tt>
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65 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; while (1) ;</font></tt>
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66 <br><tt><font size=-1>}</font></tt><tt><font size=-1></font></tt>
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67 <p><tt><font size=-1>void</font></tt>
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68 <br><tt><font size=-1>pexit(char *s)</font></tt>
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69 <br><tt><font size=-1>{</font></tt>
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70 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; perror(s);</font></tt>
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71 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; cyg_test_exit();</font></tt>
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72 <br><tt><font size=-1>}</font></tt><tt><font size=-1></font></tt>
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73 <p><tt><font size=-1>// Compute INET checksum</font></tt>
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74 <br><tt><font size=-1>int</font></tt>
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75 <br><tt><font size=-1>inet_cksum(u_short *addr, int len)</font></tt>
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76 <br><tt><font size=-1>{</font></tt>
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77 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; register int nleft = len;</font></tt>
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78 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; register u_short *w = addr;</font></tt>
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79 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; register u_short answer;</font></tt>
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80 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; register u_int sum = 0;</font></tt>
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81 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; u_short odd_byte = 0;</font></tt><tt><font size=-1></font></tt>
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82 <p><tt><font size=-1>&nbsp;&nbsp;&nbsp; /*</font></tt>
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83 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp; *&nbsp; Our algorithm is
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84 simple, using a 32 bit accumulator (sum),</font></tt>
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85 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp; *&nbsp; we add sequential
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86 16 bit words to it, and at the end, fold</font></tt>
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87 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp; *&nbsp; back all the carry
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88 bits from the top 16 bits into the lower</font></tt>
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89 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp; *&nbsp; 16 bits.</font></tt>
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90 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp; */</font></tt>
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91 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; while( nleft > 1 )&nbsp; {</font></tt>
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92 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; sum +=
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93 *w++;</font></tt>
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94 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nleft
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95 -= 2;</font></tt>
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96 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; }</font></tt><tt><font size=-1></font></tt>
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97 <p><tt><font size=-1>&nbsp;&nbsp;&nbsp; /* mop up an odd byte, if necessary
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98 */</font></tt>
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99 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; if( nleft == 1 ) {</font></tt>
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100 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *(u_char
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101 *)(&amp;odd_byte) = *(u_char *)w;</font></tt>
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102 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; sum +=
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103 odd_byte;</font></tt>
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104 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; }</font></tt><tt><font size=-1></font></tt>
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105 <p><tt><font size=-1>&nbsp;&nbsp;&nbsp; /*</font></tt>
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106 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp; * add back carry outs from
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107 top 16 bits to low 16 bits</font></tt>
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108 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp; */</font></tt>
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109 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; sum = (sum >> 16) + (sum &amp;
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110 0x0000ffff); /* add hi 16 to low 16 */</font></tt>
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111 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; sum += (sum >> 16);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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112 /* add carry */</font></tt>
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113 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; answer = ~sum;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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114 /* truncate to 16 bits */</font></tt>
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115 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; return (answer);</font></tt>
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116 <br><tt><font size=-1>}</font></tt><tt><font size=-1></font></tt>
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117 <p><tt><font size=-1>static int</font></tt>
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118 <br><tt><font size=-1>show_icmp(unsigned char *pkt, int len,</font></tt>
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119 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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120 struct sockaddr_in *from, struct sockaddr_in *to)</font></tt>
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121 <br><tt><font size=-1>{</font></tt>
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122 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; cyg_tick_count_t *tp, tv;</font></tt>
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123 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; struct ip *ip;</font></tt>
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124 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; struct icmp *icmp;</font></tt>
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125 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; tv = cyg_current_time();</font></tt>
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126 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; ip = (struct ip *)pkt;</font></tt>
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127 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; if ((len &lt; sizeof(*ip)) ||
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128 ip->ip_v != IPVERSION) {</font></tt>
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129 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; diag_printf("%s:
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130 Short packet or not IP! - Len: %d, Version: %d\n",</font></tt>
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131 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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132 inet_ntoa(from->sin_addr), len, ip->ip_v);</font></tt>
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133 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return
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134 0;</font></tt>
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135 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; }</font></tt>
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136 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; icmp = (struct icmp *)(pkt + sizeof(*ip));</font></tt>
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137 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; len -= (sizeof(*ip) + 8);</font></tt>
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138 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; tp = (cyg_tick_count_t *)&amp;icmp->icmp_data;</font></tt>
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139 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; if (icmp->icmp_type != ICMP_ECHOREPLY)
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140 {</font></tt>
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141 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; diag_printf("%s:
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142 Invalid ICMP - type: %d\n",</font></tt>
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143 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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144 inet_ntoa(from->sin_addr), icmp->icmp_type);</font></tt>
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145 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return
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146 0;</font></tt>
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147 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; }</font></tt>
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148 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; if (icmp->icmp_id != UNIQUEID)
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149 {</font></tt>
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150 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; diag_printf("%s:
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151 ICMP received for wrong id - sent: %x, recvd: %x\n",</font></tt>
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152 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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153 inet_ntoa(from->sin_addr), UNIQUEID, icmp->icmp_id);</font></tt>
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154 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; }</font></tt>
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155 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; diag_printf("%d bytes from %s:
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156 ", len, inet_ntoa(from->sin_addr));</font></tt>
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157 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; diag_printf("icmp_seq=%d", icmp->icmp_seq);</font></tt>
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158 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; diag_printf(", time=%dms\n", (int)(tv
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159 - *tp)*10);</font></tt>
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160 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; return (from->sin_addr.s_addr
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161 == to->sin_addr.s_addr);</font></tt>
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162 <br><tt><font size=-1>}</font></tt><tt><font size=-1></font></tt>
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163 <p><tt><font size=-1>static void</font></tt>
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164 <br><tt><font size=-1>ping_host(int s, struct sockaddr_in *host)</font></tt>
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165 <br><tt><font size=-1>{</font></tt>
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166 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; struct icmp *icmp = (struct icmp
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167 *)pkt1;</font></tt>
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168 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; int icmp_len = 64;</font></tt>
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169 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; int seq, ok_recv, bogus_recv;</font></tt>
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170 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; cyg_tick_count_t *tp;</font></tt>
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171 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; long *dp;</font></tt>
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172 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; struct sockaddr_in from;</font></tt>
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173 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; int i, len, fromlen;</font></tt><tt><font size=-1></font></tt>
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174 <p><tt><font size=-1>&nbsp;&nbsp;&nbsp; ok_recv = 0;</font></tt>
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175 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; bogus_recv = 0;</font></tt>
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176 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; diag_printf("PING server %s\n",
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177 <b>inet_ntoa(host->sin_addr)</b>);</font></tt></blockquote>
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178 This function takes an IP address and returns a string representation.&nbsp;
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179 Useful for printing the address.
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180 <blockquote><tt><font size=-1>&nbsp;&nbsp;&nbsp; for (seq = 0;&nbsp; seq
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181 &lt; NUM_PINGS;&nbsp; seq++) {</font></tt>
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182 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // Build
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183 ICMP packet</font></tt>
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184 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; icmp->icmp_type
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185 = ICMP_ECHO;</font></tt>
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186 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; icmp->icmp_code
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187 = 0;</font></tt>
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188 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; icmp->icmp_cksum
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189 = 0;</font></tt>
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190 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; icmp->icmp_seq
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191 = seq;</font></tt>
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192 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; icmp->icmp_id
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193 = 0x1234;</font></tt>
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194 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // Set
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195 up ping data</font></tt>
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196 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tp = (cyg_tick_count_t
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197 *)&amp;icmp->icmp_data;</font></tt>
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198 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *tp++
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199 = cyg_current_time();</font></tt>
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200 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; dp = (long
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201 *)tp;</font></tt>
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202 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; for (i
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203 = sizeof(*tp);&nbsp; i &lt; icmp_len;&nbsp; i += sizeof(*dp)) {</font></tt>
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204 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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205 *dp++ = i;</font></tt>
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206 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</font></tt>
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207 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // Add
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208 checksum</font></tt>
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209 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; icmp->icmp_cksum
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210 = inet_cksum( (u_short *)icmp, icmp_len+8);</font></tt>
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211 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // Send
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212 it off</font></tt>
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213 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>if
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214 (sendto(s, icmp, icmp_len+8, 0, (struct sockaddr *)host, sizeof(*host))
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215 &lt; 0) {</b></font></tt></blockquote>
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216 This function sends a single packet, in this case via the ICMP protocol.&nbsp;
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217 The destination address is specified by the <tt>host</tt> argument.
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218 <blockquote><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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219 perror("sendto");</font></tt>
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220 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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221 continue;</font></tt>
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222 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</font></tt>
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223 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // Wait
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224 for a response</font></tt>
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225 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fromlen
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226 = sizeof(from);</font></tt>
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227 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>len
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228 = recvfrom(s, pkt2, sizeof(pkt2), 0, (struct sockaddr *)&amp;from, &amp;fromlen);</b></font></tt></blockquote>
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229 This function waits for a packet to be sent to this interface.&nbsp; Note:
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230 this operation can fail if no packet is received with a given amount of
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231 time (this timeout value is setup in the <tt>ping_test()</tt> routine below).
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232 <blockquote><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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233 if (len &lt; 0) {</font></tt>
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234 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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235 perror("recvfrom");</font></tt>
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236 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } else
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237 {</font></tt>
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238 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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239 if (show_icmp(pkt2, len, &amp;from, host)) {</font></tt>
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240 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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241 ok_recv++;</font></tt>
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242 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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243 } else {</font></tt>
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244 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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245 bogus_recv++;</font></tt>
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246 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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247 }</font></tt>
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248 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</font></tt>
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249 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; }</font></tt>
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250 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; diag_printf("Sent %d packets,
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251 received %d OK, %d bad\n", NUM_PINGS, ok_recv, bogus_recv);</font></tt>
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252 <br><tt><font size=-1>}</font></tt><tt><font size=-1></font></tt>
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253 <p><tt><font size=-1>static void</font></tt>
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254 <br><tt><font size=-1>ping_test(struct bootp *bp)</font></tt>
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255 <br><tt><font size=-1>{</font></tt>
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256 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; struct protoent *p;</font></tt>
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257 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; struct timeval tv;</font></tt>
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258 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; struct sockaddr_in host;</font></tt>
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259 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; int s;</font></tt><tt><font size=-1></font></tt>
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260 <p><tt><font size=-1>&nbsp;&nbsp;&nbsp; <b>if ((p = getprotobyname("icmp"))
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261 == (struct protoent *)0) {</b></font></tt></blockquote>
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262 This function gets information about the ICMP protocol.&nbsp; This will
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263 be used below to set up the "socket" (the handle to a network connection).
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264 <blockquote><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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265 perror("getprotobyname");</font></tt>
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266 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return;</font></tt>
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267 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; }</font></tt>
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268 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; <b>s = socket(AF_INET, SOCK_RAW,
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269 p->p_proto);</b></font></tt></blockquote>
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270 Create the socket "s".&nbsp; A socket is an abstract object (sometimes
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271 called a handle or endpoint).&nbsp; Sockets come in many flavors, RAW sockets
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272 are used for communicating with non-structured protocols.&nbsp; DATAGRAM
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273 sockets are used for packet oriented protocols, such as UDP.&nbsp; STREAM
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274 sockets are used for reliable, sequenced byte streams, such as those provided
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275 by TCP.
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276 <blockquote><tt><font size=-1>&nbsp;&nbsp;&nbsp; if (s &lt; 0) {</font></tt>
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277 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; perror("socket");</font></tt>
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278 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return;</font></tt>
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279 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; }</font></tt>
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280 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; tv.tv_sec = 1;</font></tt>
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281 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; tv.tv_usec = 0;</font></tt>
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282 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; <b>setsockopt(s, SOL_SOCKET, SO_RCVTIMEO,
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283 &amp;tv, sizeof(tv));</b></font></tt></blockquote>
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284 This function instructs the system that receive operations (see <tt>ping_host()</tt>
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285 above) must complete within 1 second or issue a timed out error condition.
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286 <blockquote><tt><font size=-1>&nbsp;&nbsp;&nbsp; // Set up host address</font></tt>
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287 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; host.sin_family = AF_INET;</font></tt>
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288 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; host.sin_addr = bp->bp_siaddr;</font></tt>
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289 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; host.sin_port = 0;</font></tt>
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290 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; ping_host(s, &amp;host);</font></tt>
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291 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; // Now try a bogus host</font></tt>
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292 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; host.sin_addr.s_addr = htonl(ntohl(host.sin_addr.s_addr)
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293 + 32);</font></tt>
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294 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; ping_host(s, &amp;host);</font></tt>
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295 <br><tt><font size=-1>}</font></tt>
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296 <br><tt><font size=-1></font></tt>&nbsp;</blockquote>
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297 This function drives the test.
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298 <blockquote><tt><font size=-1>void</font></tt>
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299 <br><tt><font size=-1>net_test(cyg_addrword_t p)</font></tt>
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300 <br><tt><font size=-1>{</font></tt>
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301 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; diag_printf("Start PING test\n");</font></tt>
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302 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; <b>init_all_network_interfaces();</b></font></tt></blockquote>
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303 This is a call to the network initialization code.&nbsp; Note that it must
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304 be executed from a thread context, thus we can't put it in the <tt>cyg_start()
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305 </tt>function which follows.&nbsp; The <tt>init_all_network_interfaces()</tt>
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306 routine will cause the networking system to be initialized and any hardware
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307 interfaces will be set up.&nbsp; Using the system configuration information,
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308 an interface can be started using either <b>BOOTP</b>,&nbsp; or a predefined
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309 configuration with static IP information.&nbsp; It is also possible to
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310 indicate that an interface will be configured by the user code, outside
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311 of "<tt>init_all_network_interfaces()</tt>".
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312 <br><tt><font size=-1>&nbsp;</font></tt>
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313 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; #ifdef CYGHWR_NET_DRIVER_ETH0</font></tt>
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314 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (eth0_up)
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315 {</font></tt>
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316 <blockquote><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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317 ping_test(&amp;eth0_bootp_data);</font></tt>
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318 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; }</font></tt>
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319 <br><tt><font size=-1>#endif</font></tt></blockquote>
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320 Notice that there is a BOOTP information structure kept about all hardware
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321 interfaces.&nbsp; This is created and initialized by the call to <tt>init_all_network_interfaces()</tt>,
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322 unless manual configuration is selected.&nbsp; This information can be
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323 used by the application to learn things such as the local IP address, server
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324 name, etc.
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325 <blockquote><tt><font size=-1>#ifdef CYGHWR_NET_DRIVER_ETH1</font></tt>
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326 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; if (eth1_up) {</font></tt>
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327 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ping_test(&amp;eth1_bootp_data);</font></tt>
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328 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; }</font></tt>
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329 <br><tt><font size=-1>#endif</font></tt></blockquote>
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330 Multiple hardware interfaces can be supported, depending on the hardware
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331 platform.&nbsp; If the platform provides a single ethernet device then&nbsp;
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332 <b><tt>CYGHWR_NET_DRIVER_ETH0 </tt></b>will be defined.&nbsp; If there
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333 is a second interface, then will <b><tt>CYGHWR_NET_DRIVER_ETH1 </tt></b>be
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334 defined.
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335 <blockquote><tt><font size=-1>&nbsp;&nbsp;&nbsp; cyg_test_exit();</font></tt>
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336 <br><tt><font size=-1>}</font></tt>
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337 <br><tt><font size=-1></font></tt>&nbsp;</blockquote>
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338 The following function creates an initial thread which runs the program.&nbsp;
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339 This could just as easily be done by naming the <tt>net_test()</tt> function
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340 <tt>main()</tt>.
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341 <blockquote><tt><font size=-1>void</font></tt>
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342 <br><tt><font size=-1>cyg_start(void)</font></tt>
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343 <br><tt><font size=-1>{</font></tt>
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344 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; // Create a main thread, so we
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345 can run the scheduler and have time 'pass'</font></tt>
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346 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; cyg_thread_create(10,&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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347 // Priority - just a number</font></tt>
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348 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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349 net_test,&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // entry</font></tt>
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350 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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351 0,&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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352 // entry parameter</font></tt>
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353 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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354 "Network test",&nbsp;&nbsp;&nbsp; // Name</font></tt>
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355 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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356 &amp;stack[0],&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // Stack</font></tt>
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357 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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358 STACK_SIZE,&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // Size</font></tt>
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359 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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360 &amp;thread_handle,&nbsp;&nbsp;&nbsp; // Handle</font></tt>
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361 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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362 &amp;thread_data&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // Thread data structure</font></tt>
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363 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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364 );</font></tt>
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365 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; cyg_thread_resume(thread_handle);&nbsp;
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366 // Start it</font></tt>
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367 <br><tt><font size=-1>&nbsp;&nbsp;&nbsp; cyg_scheduler_start();</font></tt>
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368 <br><tt><font size=-1>}</font></tt></blockquote>
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369
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370 </body>
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371 </html>