📄 web_serv.c
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/* web_server.c * Copyright Mark Watson 1999. Open Source software license. */#include <stdio.h>#include <string.h>#include <sys/socket.h>#include <netinet/in.h>#include <netdb.h>#include <errno.h>unsigned short port = 8000; // Default server port number#define DEBUG 1char * error_return = "<HTML>\n<BODY>File not found\n</BODY>\n</HTML>";char ret_buf[32768];char * read_file(char * buf, int num_buf) { int i; char *cp, *cp2; FILE *f; cp = buf + 5; cp2 = strstr(cp, " HTTP"); if (cp2 != NULL) *cp2 = '\0'; if (DEBUG) printf("file: |%s|\n", cp); // fetch file: f = fopen(cp, "r"); if (f == NULL) return error_return; i = fread(ret_buf, 1, 32768, f); if (DEBUG) printf("%d bytes read from file %s\n", i, cp); if (i == 0) { fclose(f); return error_return; } ret_buf[i] = '\0'; fclose(f); return ret_buf;}int main(int argc, char* argv[]) { int i, sock; char* recvBuffer = (char *)malloc(4001); int rc = 0; int serverSocket; struct sockaddr_in serverAddr; struct sockaddr_in clientAddr; int clientAddrSize; struct hostent* entity; int totalReceived; int size; int totalSent; int bytesSent; char * cbuf; serverSocket = socket(AF_INET, SOCK_STREAM, 0); if (serverSocket == -1) { printf("Invalid socket\n"); exit(1); } serverAddr.sin_family = AF_INET; serverAddr.sin_port = htons(port); serverAddr.sin_addr.s_addr = htonl(INADDR_ANY); memset(&(serverAddr.sin_zero), 0, 8); printf("Binding server socket to port %d\n", port); rc = bind(serverSocket, (struct sockaddr*) &serverAddr, sizeof(struct sockaddr)); if (rc == -1) { printf("Bad bind\n"); exit(1); } rc = listen(serverSocket, 10); // allow 10 queued requests if (rc == -1) { printf("Bad listen\n"); exit(1); } printf("Accepting connections ...\n"); while (1) { clientAddrSize = sizeof(struct sockaddr_in); do sock = accept(serverSocket, (struct sockaddr*) &clientAddr, &clientAddrSize); while ((sock == -1) && (errno == EINTR)); if (sock == -1) { printf("Bad accept\n"); exit(1); } entity = gethostbyaddr((char*) &clientAddr.sin_addr, sizeof(struct in_addr), AF_INET); if (DEBUG) printf("Connection from %d\n", inet_ntoa((struct in_addr) clientAddr.sin_addr)); i = recv(sock, recvBuffer, 4000, 0); if (i == -1) break; if (recvBuffer[i - 1] != '\n') break; recvBuffer[i] = '\0'; if (DEBUG) { printf("Received from client: %s\n", recvBuffer); } // call a separate work function to process request: cbuf = read_file(recvBuffer, totalReceived); size = strlen(cbuf); totalSent = 0; do { bytesSent = send(sock, cbuf + totalSent, strlen(cbuf + totalSent), 0); if (bytesSent == -1) break; totalSent += bytesSent; } while (totalSent < size); if (DEBUG) printf("Connection closed by client.\n"); close(sock); } return 0;}⌨️ 快捷键说明
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