adamc@116
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1 #include <stdio.h>
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2
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3 #include <string.h>
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4 #include <sys/types.h>
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5 #include <sys/socket.h>
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6 #include <netinet/in.h>
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7
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8 int lw_port = 8080;
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9 int lw_backlog = 10;
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10 int lw_bufsize = 1024;
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11
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12 void lw_handle(char*);
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13
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14 static void worker(int sock) {
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15 char buf[lw_bufsize+1], *back = buf, *s;
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16
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17 while (1) {
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18 int r = recv(sock, back, lw_bufsize - (back - buf), 0);
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19
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20 if (r < 0) {
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21 fprintf(stderr, "Recv failed\n");
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22 close(sock);
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23 return;
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24 }
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25
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26 if (r == 0) {
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27 printf("Connection closed.\n");
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28 close(sock);
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29 return;
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30 }
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31
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32 printf("Received %d bytes.\n", r);
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33
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34 back += r;
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35 *back = 0;
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36
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37 if (s = strstr(buf, "\r\n\r\n")) {
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38 char *cmd, *path;
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39
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40 *s = 0;
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41
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42 if (!(s = strstr(buf, "\n"))) {
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43 fprintf(stderr, "No newline in buf\n");
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44 close(sock);
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45 return;
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46 }
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47
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48 *s = 0;
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49 cmd = s = buf;
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50
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51 if (!strsep(&s, " ")) {
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52 fprintf(stderr, "No first space in HTTP command\n");
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53 close(sock);
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54 return;
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55 }
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56
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57 if (strcmp(cmd, "GET")) {
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58 fprintf(stderr, "Not ready for non-get command: %s\n", cmd);
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59 close(sock);
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60 return;
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61 }
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62
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63 path = s;
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64 if (!strsep(&s, " ")) {
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65 fprintf(stderr, "No second space in HTTP command\n");
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66 close(sock);
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67 return;
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68 }
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69
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70 printf("Serving URI %s....\n", path);
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71 puts("Content-type: text/html\n\n");
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72 puts("<html>");
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73 lw_handle(path);
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74 puts("</html>");
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75
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76 printf("Done with client.\n\n");
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77 close(sock);
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78 return;
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79 }
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80 }
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81 }
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82
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83 int main() {
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84 // The skeleton for this function comes from Beej's sockets tutorial.
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85 int sockfd, new_fd; // listen on sock_fd, new connection on new_fd
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86 struct sockaddr_in my_addr;
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87 struct sockaddr_in their_addr; // connector's address information
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88 int sin_size, yes = 1;
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89
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90 sockfd = socket(PF_INET, SOCK_STREAM, 0); // do some error checking!
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91
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92 if (sockfd < 0) {
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93 fprintf(stderr, "Listener socket creation failed\n");
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94 return 1;
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95 }
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96
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97 if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) < 0) {
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98 fprintf(stderr, "Listener socket option setting failed\n");
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99 return 1;
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100 }
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101
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102 my_addr.sin_family = AF_INET; // host byte order
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103 my_addr.sin_port = htons(lw_port); // short, network byte order
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104 my_addr.sin_addr.s_addr = INADDR_ANY; // auto-fill with my IP
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105 memset(my_addr.sin_zero, '\0', sizeof my_addr.sin_zero);
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106
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107 if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof my_addr) < 0) {
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108 fprintf(stderr, "Listener socket bind failed\n");
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109 return 1;
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110 }
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111
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112 if (listen(sockfd, lw_backlog) < 0) {
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113 fprintf(stderr, "Socket listen failed\n");
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114 return 1;
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115 }
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116
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117 sin_size = sizeof their_addr;
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118
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119 printf("Listening on port %d....\n", lw_port);
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120
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121 while (1) {
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122 new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
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123
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124 if (new_fd < 0) {
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125 fprintf(stderr, "Socket accept failed\n");
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126 return 1;
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127 }
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128
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129 printf("Accepted connection.\n");
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130 worker(new_fd);
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131 }
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132 }
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