FreeCalypso > hg > themwi-system-sw

annotate utils/tcpserv-dump.c @ 217:9f6a148ceb25

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tcpserv-dump: brown paper bag
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 24 Jul 2023 22:33:01 -0800
parents 6aa2cd650943
children
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1 /*
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2 * This debug utility binds to a TCP port specified on the command line,
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3 * accepts incoming TCP connections and reads any bytes sent by a client
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4 * on an opened connection - but never sends anything back. A log file
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5 * is written, recording all received connections and bytes.
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6 */
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7
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8 #include <sys/types.h>
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9 #include <sys/socket.h>
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10 #include <sys/time.h>
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11 #include <sys/errno.h>
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12 #include <netinet/in.h>
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13 #include <arpa/inet.h>
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14 #include <stdio.h>
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15 #include <stdlib.h>
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16 #include <string.h>
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17 #include <strings.h>
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18 #include <time.h>
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19 #include <unistd.h>
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20
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21 #define MAXCONN 10
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22
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23 static struct in_addr bind_ip;
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24 static int tcp_port;
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25 static int listener, nconn, conns[MAXCONN], max_fd;
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26 static FILE *logf;
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27 static struct timeval curtime;
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28 static char fmt_time[32];
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30 static void
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31 format_time()
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32 {
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33 struct tm *tm;
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34
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35 tm = gmtime(&curtime.tv_sec);
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36 sprintf(fmt_time, "%d-%02d-%02dT%02d:%02d:%02dZ",
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37 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
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38 tm->tm_hour, tm->tm_min, tm->tm_sec);
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39 }
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41 static void
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42 handle_accept(newfd, sin)
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43 struct sockaddr_in *sin;
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44 {
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45 fprintf(logf, "\n%s Accept conn from %s:%u fd %d\n", fmt_time,
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46 inet_ntoa(sin->sin_addr), ntohs(sin->sin_port), newfd);
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47 if (nconn < MAXCONN) {
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48 conns[nconn] = newfd;
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49 nconn++;
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50 if (newfd > max_fd)
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51 max_fd = newfd;
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52 } else {
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53 fprintf(logf, "MAXCONN exceeded, closing new fd\n");
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54 close(newfd);
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55 }
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56 }
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57
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58 static int
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59 handle_conn_fd(fd)
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60 {
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61 u_char buf[512];
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62 int cc, off, chunk, i, c;
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63
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64 cc = read(fd, buf, sizeof buf);
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65 fprintf(logf, "\n%s fd %d read %d\n", fmt_time, fd, cc);
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66 if (cc <= 0) {
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67 fprintf(logf, "closing fd\n");
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68 return(1);
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69 }
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70 for (off = 0; off < cc; off += chunk) {
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71 fprintf(logf, "%04X: ", off);
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72 chunk = cc - off;
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73 if (chunk > 16)
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74 chunk = 16;
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75 for (i = 0; i < 16; i++) {
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76 if (i < chunk)
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77 fprintf(logf, "%02X ", buf[off + i]);
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78 else
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79 fputs(" ", logf);
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80 if (i == 7 || i == 15)
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81 putc(' ', logf);
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82 }
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83 for (i = 0; i < chunk; i++) {
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84 c = buf[off + i];
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85 if (c < ' ' || c > '~')
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86 c = '.';
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87 putc(c, logf);
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88 }
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89 putc('\n', logf);
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90 }
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91 return(0);
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92 }
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93
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94 main(argc, argv)
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95 char **argv;
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96 {
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97 int rc, i;
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98 struct sockaddr_in sin;
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99 socklen_t addrlen;
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100 fd_set fds;
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101
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102 if (argc != 4) {
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103 fprintf(stderr, "usage: %s bind-ip port logfile\n", argv[0]);
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104 exit(1);
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105 }
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106 bind_ip.s_addr = inet_addr(argv[1]);
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107 if (bind_ip.s_addr == INADDR_NONE) {
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108 fprintf(stderr, "error: invalid IP address argument \"%s\"\n",
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109 argv[1]);
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110 exit(1);
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111 }
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112 tcp_port = atoi(argv[2]);
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113 listener = socket(AF_INET, SOCK_STREAM, 0);
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114 if (listener < 0) {
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115 perror("socket");
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116 exit(1);
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117 }
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118 sin.sin_family = AF_INET;
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119 sin.sin_addr = bind_ip;
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120 sin.sin_port = htons(tcp_port);
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121 rc = bind(listener, (struct sockaddr *) &sin, sizeof sin);
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122 if (rc < 0) {
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123 perror("bind");
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124 exit(1);
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125 }
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126 logf = fopen(argv[3], "a");
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127 if (!logf) {
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128 perror(argv[3]);
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129 exit(1);
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130 }
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131 rc = listen(listener, 5);
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132 if (rc < 0) {
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133 perror("listen");
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134 exit(1);
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135 }
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136 gettimeofday(&curtime, 0);
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137 format_time();
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138 fprintf(logf, "\n%s Test server started\n", fmt_time);
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139 fflush(logf);
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140 nconn = 0;
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141 max_fd = listener;
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142 for (;;) {
215
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143 FD_ZERO(&fds);
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144 FD_SET(listener, &fds);
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145 for (i = 0; i < nconn; i++)
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146 FD_SET(conns[i], &fds);
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147 rc = select(max_fd+1, &fds, 0, 0, 0);
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148 if (rc < 0) {
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149 if (errno == EINTR)
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150 continue;
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151 perror("select");
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152 exit(1);
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153 }
215
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154 gettimeofday(&curtime, 0);
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155 format_time();
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156 for (i = 0; i < nconn; ) {
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157 if (!FD_ISSET(conns[i], &fds)) {
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158 i++;
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159 continue;
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160 }
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161 if (handle_conn_fd(conns[i])) {
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162 close(conns[i]);
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163 nconn--;
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164 conns[i] = conns[nconn];
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165 } else
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166 i++;
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167 }
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168 if (FD_ISSET(listener, &fds)) {
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169 addrlen = sizeof(struct sockaddr_in);
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170 rc = accept(listener, (struct sockaddr *) &sin,
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171 &addrlen);
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172 if (rc >= 0)
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173 handle_accept(rc, &sin);
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174 else
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175 fprintf(logf, "\n%s accept syscall error!\n",
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176 fmt_time);
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177 }
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178 fflush(logf);
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179 }
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180 }