mirror of
https://github.com/lxsang/ant-http
synced 2024-11-16 08:38:22 +01:00
363 lines
10 KiB
C
363 lines
10 KiB
C
#include "http_server.h"
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/**********************************************************************/
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/* A request has caused a call to accept() on the server port to
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* return. Process the request appropriately.
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* Parameters: the socket connected to the client */
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/**********************************************************************/
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void accept_request(int client)
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{
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char buf[1024];
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int numchars;
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char method[255];
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char url[255];
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char path[512];
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size_t i, j;
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struct stat st;
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char *query_string = NULL;
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numchars = get_line(client, buf, sizeof(buf));
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i = 0; j = 0;
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while (!ISspace(buf[j]) && (i < sizeof(method) - 1))
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{
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method[i] = buf[j];
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i++; j++;
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}
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method[i] = '\0';
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if (strcasecmp(method, "GET") && strcasecmp(method, "POST"))
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{
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unimplemented(client);
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return;
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}
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i = 0;
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while (ISspace(buf[j]) && (j < sizeof(buf)))
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j++;
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while (!ISspace(buf[j]) && (i < sizeof(url) - 1) && (j < sizeof(buf)))
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{
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url[i] = buf[j];
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i++; j++;
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}
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url[i] = '\0';
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if (strcasecmp(method, "GET") == 0)
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{
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query_string = url;
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while ((*query_string != '?') && (*query_string != '\0'))
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query_string++;
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if (*query_string == '?')
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{
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*query_string = '\0';
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query_string++;
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}
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}
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sprintf(path, server_config.htdocs);
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strcat(path, url);
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//LOG("Path %s\n", path);
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if (path[strlen(path) - 1] == '/')
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strcat(path, "index.html");
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if (stat(path, &st) == -1) {
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if(execute_plugin(client,url,method,query_string) < 0)
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not_found(client);
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}
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else
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{
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if (S_ISDIR(st.st_mode))
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strcat(path, "/index.html");
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serve_file(client, path);
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}
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close(client);
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}
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/**********************************************************************/
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/* Inform the client that a request it has made has a problem.
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* Parameters: client socket */
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/**********************************************************************/
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void bad_request(int client)
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{
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char buf[1024];
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sprintf(buf, "HTTP/1.0 400 BAD REQUEST\r\n");
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send(client, buf, sizeof(buf), 0);
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sprintf(buf, "Content-type: text/html\r\n");
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send(client, buf, sizeof(buf), 0);
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sprintf(buf, "\r\n");
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send(client, buf, sizeof(buf), 0);
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sprintf(buf, "<P>Your browser sent a bad request, ");
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send(client, buf, sizeof(buf), 0);
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sprintf(buf, "such as a POST without a Content-Length.\r\n");
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send(client, buf, sizeof(buf), 0);
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}
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/**********************************************************************/
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/* Put the entire contents of a file out on a socket. This function
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* is named after the UNIX "cat" command, because it might have been
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* easier just to do something like pipe, fork, and exec("cat").
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* Parameters: the client socket descriptor
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* FILE pointer for the file to cat */
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/**********************************************************************/
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void __b(int client, const unsigned char* data, int size)
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{
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char buf[BUFFLEN];
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int sent = 0;
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int buflen = 0;
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if(size <= BUFFLEN)
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send(client,data,size,0);
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else
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{
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while(sent < size)
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{
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if(size - sent > BUFFLEN)
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buflen = BUFFLEN;
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else
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buflen = size - sent;
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memcpy(buf,data+sent,buflen);
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send(client,buf,buflen,0);
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sent += buflen;
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}
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}
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}
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void catb(int client, FILE* ptr)
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{
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unsigned char buffer[BUFFLEN];
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while(!feof(ptr))
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{
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fread(buffer,BUFFLEN,1,ptr);
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__b(client,buffer,BUFFLEN);
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}
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//fclose(ptr);
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}
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void cat(int client, FILE *resource)
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{
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char buf[1024];
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fgets(buf, sizeof(buf), resource);
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while (!feof(resource))
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{
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send(client, buf, strlen(buf), 0);
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fgets(buf, sizeof(buf), resource);
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}
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}
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/**********************************************************************/
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/* Inform the client that a CGI script could not be executed.
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* Parameter: the client socket descriptor. */
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/**********************************************************************/
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void cannot_execute(int client)
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{
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char buf[1024];
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sprintf(buf, "HTTP/1.0 500 Internal Server Error\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "Content-type: text/html\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "<P>Error prohibited CGI execution.\r\n");
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send(client, buf, strlen(buf), 0);
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}
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/**********************************************************************/
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/* Print out an error message with perror() (for system errors; based
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* on value of errno, which indicates system call errors) and exit the
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* program indicating an error. */
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/**********************************************************************/
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void error_die(const char *sc)
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{
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perror(sc);
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exit(1);
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}
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/**********************************************************************/
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/* Get a line from a socket, whether the line ends in a newline,
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* carriage return, or a CRLF combination. Terminates the string read
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* with a null character. If no newline indicator is found before the
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* end of the buffer, the string is terminated with a null. If any of
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* the above three line terminators is read, the last character of the
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* string will be a linefeed and the string will be terminated with a
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* null character.
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* Parameters: the socket descriptor
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* the buffer to save the data in
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* the size of the buffer
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* Returns: the number of bytes stored (excluding null) */
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/**********************************************************************/
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int get_line(int sock, char *buf, int size)
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{
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int i = 0;
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char c = '\0';
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int n;
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while ((i < size - 1) && (c != '\n'))
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{
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n = recv(sock, &c, 1, 0);
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/* DEBUG printf("%02X\n", c); */
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if (n > 0)
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{
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if (c == '\r')
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{
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n = recv(sock, &c, 1, MSG_PEEK);
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/* DEBUG printf("%02X\n", c); */
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if ((n > 0) && (c == '\n'))
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recv(sock, &c, 1, 0);
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else
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c = '\n';
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}
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buf[i] = c;
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i++;
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}
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else
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c = '\n';
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}
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buf[i] = '\0';
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return(i);
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}
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/**********************************************************************/
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/* Return the informational HTTP headers about a file. */
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/* Parameters: the socket to print the headers on
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* the name of the file */
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/**********************************************************************/
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void headers(int client, const char *filename)
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{
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char buf[1024];
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//printf("Mime %s\n", mime(filename));
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strcpy(buf, "HTTP/1.0 200 OK\r\n");
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send(client, buf, strlen(buf), 0);
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strcpy(buf, SERVER_STRING);
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "Content-Type: %s\r\n",mime(filename));
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send(client, buf, strlen(buf), 0);
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strcpy(buf, "\r\n");
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send(client, buf, strlen(buf), 0);
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}
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/**********************************************************************/
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/* Give a client a 404 not found status message. */
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/**********************************************************************/
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void not_found(int client)
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{
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char buf[1024];
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sprintf(buf, "HTTP/1.0 404 NOT FOUND\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, SERVER_STRING);
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "Content-Type: text/html\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "<HTML><TITLE>Not Found</TITLE>\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "<BODY><P>The server could not fulfill\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "your request because the resource specified\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "is unavailable or nonexistent.\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "</BODY></HTML>\r\n");
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send(client, buf, strlen(buf), 0);
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}
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/**********************************************************************/
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/* Send a regular file to the client. Use headers, and report
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* errors to client if they occur.
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* Parameters: a pointer to a file structure produced from the socket
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* file descriptor
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* the name of the file to serve */
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/**********************************************************************/
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void serve_file(int client, const char *filename)
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{
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FILE *resource = NULL;
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int numchars = 1;
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char buf[1024];
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buf[0] = 'A'; buf[1] = '\0';
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while ((numchars > 0) && strcmp("\n", buf)) /* read & discard headers */
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numchars = get_line(client, buf, sizeof(buf));
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resource = fopen(filename, "rb");
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if (resource == NULL)
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not_found(client);
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else
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{
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headers(client, filename);
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if(is_bin(filename))
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catb(client,resource);
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else
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cat(client, resource);
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}
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fclose(resource);
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}
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/**********************************************************************/
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/* This function starts the process of listening for web connections
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* on a specified port. If the port is 0, then dynamically allocate a
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* port and modify the original port variable to reflect the actual
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* port.
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* Parameters: pointer to variable containing the port to connect on
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* Returns: the socket */
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/**********************************************************************/
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int startup(unsigned *port)
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{
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int httpd = 0;
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struct sockaddr_in name;
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httpd = socket(PF_INET, SOCK_STREAM, 0);
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if (httpd == -1)
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error_die("socket");
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memset(&name, 0, sizeof(name));
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name.sin_family = AF_INET;
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name.sin_port = htons(*port);
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name.sin_addr.s_addr = htonl(INADDR_ANY);
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if (bind(httpd, (struct sockaddr *)&name, sizeof(name)) < 0)
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error_die("bind");
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if (*port == 0) /* if dynamically allocating a port */
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{
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socklen_t namelen = sizeof(name);
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if (getsockname(httpd, (struct sockaddr *)&name, &namelen) == -1)
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error_die("getsockname");
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*port = ntohs(name.sin_port);
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}
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if (listen(httpd, 5) < 0)
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error_die("listen");
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return(httpd);
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}
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/**********************************************************************/
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/* Inform the client that the requested web method has not been
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* implemented.
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* Parameter: the client socket */
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/**********************************************************************/
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void unimplemented(int client)
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{
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char buf[1024];
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sprintf(buf, "HTTP/1.0 501 Method Not Implemented\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, SERVER_STRING);
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "Content-Type: text/html\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "<HTML><HEAD><TITLE>Method Not Implemented\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "</TITLE></HEAD>\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "<BODY><P>HTTP request method not supported.\r\n");
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send(client, buf, strlen(buf), 0);
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sprintf(buf, "</BODY></HTML>\r\n");
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send(client, buf, strlen(buf), 0);
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}
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