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annotate src/c/driver.c @ 116:c5d7ce9ddd57

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Basic web server
author Adam Chlipala <adamc@hcoop.net>
date Sun, 13 Jul 2008 13:38:23 -0400
parents 5f04adf47f48
children 94856a3b4752
rev   line source
adamc@116 1 #include <stdio.h>
adamc@116 2
adamc@116 3 #include <string.h>
adamc@116 4 #include <sys/types.h>
adamc@116 5 #include <sys/socket.h>
adamc@116 6 #include <netinet/in.h>
adamc@116 7
adamc@116 8 int lw_port = 8080;
adamc@116 9 int lw_backlog = 10;
adamc@116 10 int lw_bufsize = 1024;
adamc@116 11
adamc@116 12 void lw_handle(char*);
adamc@116 13
adamc@116 14 static void worker(int sock) {
adamc@116 15 char buf[lw_bufsize+1], *back = buf, *s;
adamc@116 16
adamc@116 17 while (1) {
adamc@116 18 int r = recv(sock, back, lw_bufsize - (back - buf), 0);
adamc@116 19
adamc@116 20 if (r < 0) {
adamc@116 21 fprintf(stderr, "Recv failed\n");
adamc@116 22 close(sock);
adamc@116 23 return;
adamc@116 24 }
adamc@116 25
adamc@116 26 if (r == 0) {
adamc@116 27 printf("Connection closed.\n");
adamc@116 28 close(sock);
adamc@116 29 return;
adamc@116 30 }
adamc@116 31
adamc@116 32 printf("Received %d bytes.\n", r);
adamc@116 33
adamc@116 34 back += r;
adamc@116 35 *back = 0;
adamc@116 36
adamc@116 37 if (s = strstr(buf, "\r\n\r\n")) {
adamc@116 38 char *cmd, *path;
adamc@116 39
adamc@116 40 *s = 0;
adamc@116 41
adamc@116 42 if (!(s = strstr(buf, "\n"))) {
adamc@116 43 fprintf(stderr, "No newline in buf\n");
adamc@116 44 close(sock);
adamc@116 45 return;
adamc@116 46 }
adamc@116 47
adamc@116 48 *s = 0;
adamc@116 49 cmd = s = buf;
adamc@116 50
adamc@116 51 if (!strsep(&s, " ")) {
adamc@116 52 fprintf(stderr, "No first space in HTTP command\n");
adamc@116 53 close(sock);
adamc@116 54 return;
adamc@116 55 }
adamc@116 56
adamc@116 57 if (strcmp(cmd, "GET")) {
adamc@116 58 fprintf(stderr, "Not ready for non-get command: %s\n", cmd);
adamc@116 59 close(sock);
adamc@116 60 return;
adamc@116 61 }
adamc@116 62
adamc@116 63 path = s;
adamc@116 64 if (!strsep(&s, " ")) {
adamc@116 65 fprintf(stderr, "No second space in HTTP command\n");
adamc@116 66 close(sock);
adamc@116 67 return;
adamc@116 68 }
adamc@116 69
adamc@116 70 printf("Serving URI %s....\n", path);
adamc@116 71 puts("Content-type: text/html\n\n");
adamc@116 72 puts("<html>");
adamc@116 73 lw_handle(path);
adamc@116 74 puts("</html>");
adamc@116 75
adamc@116 76 printf("Done with client.\n\n");
adamc@116 77 close(sock);
adamc@116 78 return;
adamc@116 79 }
adamc@116 80 }
adamc@116 81 }
adamc@102 82
adamc@102 83 int main() {
adamc@116 84 // The skeleton for this function comes from Beej's sockets tutorial.
adamc@116 85 int sockfd, new_fd; // listen on sock_fd, new connection on new_fd
adamc@116 86 struct sockaddr_in my_addr;
adamc@116 87 struct sockaddr_in their_addr; // connector's address information
adamc@116 88 int sin_size, yes = 1;
adamc@116 89
adamc@116 90 sockfd = socket(PF_INET, SOCK_STREAM, 0); // do some error checking!
adamc@116 91
adamc@116 92 if (sockfd < 0) {
adamc@116 93 fprintf(stderr, "Listener socket creation failed\n");
adamc@116 94 return 1;
adamc@116 95 }
adamc@116 96
adamc@116 97 if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) < 0) {
adamc@116 98 fprintf(stderr, "Listener socket option setting failed\n");
adamc@116 99 return 1;
adamc@116 100 }
adamc@116 101
adamc@116 102 my_addr.sin_family = AF_INET; // host byte order
adamc@116 103 my_addr.sin_port = htons(lw_port); // short, network byte order
adamc@116 104 my_addr.sin_addr.s_addr = INADDR_ANY; // auto-fill with my IP
adamc@116 105 memset(my_addr.sin_zero, '\0', sizeof my_addr.sin_zero);
adamc@116 106
adamc@116 107 if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof my_addr) < 0) {
adamc@116 108 fprintf(stderr, "Listener socket bind failed\n");
adamc@116 109 return 1;
adamc@116 110 }
adamc@116 111
adamc@116 112 if (listen(sockfd, lw_backlog) < 0) {
adamc@116 113 fprintf(stderr, "Socket listen failed\n");
adamc@116 114 return 1;
adamc@116 115 }
adamc@116 116
adamc@116 117 sin_size = sizeof their_addr;
adamc@116 118
adamc@116 119 printf("Listening on port %d....\n", lw_port);
adamc@116 120
adamc@116 121 while (1) {
adamc@116 122 new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
adamc@116 123
adamc@116 124 if (new_fd < 0) {
adamc@116 125 fprintf(stderr, "Socket accept failed\n");
adamc@116 126 return 1;
adamc@116 127 }
adamc@116 128
adamc@116 129 printf("Accepted connection.\n");
adamc@116 130 worker(new_fd);
adamc@116 131 }
adamc@102 132 }