Copy the (early prototype of) remoting in Chrome into the public tree....

remoting/tools/client_webserver/main.c

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Simple webserver that returns empty content with the requested mimetype.
+//
+// For example:
+//   http://localhost:8080/pepper-application/x-chromoting-plugin
+// Will return empty content, but with the requested mimetype:
+//   Content-Type: pepper-application/x-chromoting-plugin
+//
+// This is useful for testing the Chromoting plugin while we wait for
+// updated mimetype support to be added to Chrome.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <netinet/in.h>
+
+#define PORT 8080
+
+void error(const char *msg) {
+  fprintf(stderr, "ERROR - %s\n", msg);
+  exit(1);
+}
+
+// Read text data from a socket to a buffer.
+// Data up to the next \n char is read into the buffer.
+void read_text_data(int sock, char *buffer, int buffsize) {
+  int num_bytes;
+  *buffer = '\0';
+
+  for (num_bytes = 1; num_bytes < buffsize-1; num_bytes++) {
+    char ch;
+
+    int num_bytes_read = read(sock, &ch, 1);
+    if (num_bytes_read == 1) {
+      if (ch == '\n') {
+        break;
+      }
+      *buffer++ = ch;
+    } else if (num_bytes_read == 0) {
+      break;
+    } else {
+      error("read_text_data failed");
+    }
+  }
+  *buffer++ = '\0';
+}
+
+// Write data from a null-terminated buffer to a socket.
+void write_data(int sock, const char *buffer) {
+  int num_bytes = strlen(buffer);
+
+  while (num_bytes > 0) {
+    int num_bytes_written = write(sock, buffer, num_bytes);
+    if (num_bytes_written <= 0) {
+      error("write_data failed");
+    }
+    num_bytes -= num_bytes_written;
+    buffer += num_bytes_written;
+  }
+}
+
+void handle_request(int connection) {
+  printf("Handling request...\n");
+  char buffer[512];
+  buffer[0] = '\0';
+
+  // Read the first line of the request. This will be something like:
+  //   GET /index.html HTTP/1.1
+  read_text_data(connection, buffer, 512);
+
+  char *saveptr;
+  char *request = strtok_r(buffer, " ", &saveptr);
+  char *resource = strtok_r(NULL, " ", &saveptr);
+  char *version = strtok_r(NULL, " ", &saveptr);
+
+  char mime_type[512];
+  strncpy(mime_type, &resource[1], 511);
+  mime_type[511] = '\0';
+
+  if (strcmp(request, "GET")) {
+    printf("Unknown request: 'GET %s %s'\n", request, version);
+  } else {
+    printf("Requesting '%s'\n", mime_type);
+  }
+
+  // Keep reading until we encounter a blank line.
+  // This will skip over the Host, Connection, User-Agent, ...
+  char ignore[512] = "ignore";
+  while (strspn(ignore, " \n\r\t") != strlen(ignore)) {
+    read_text_data(connection, ignore, sizeof(ignore));
+  }
+
+  // At this point, a normal webserver would verify that the requested
+  // resource exists and then return it with the appropriate mimetype.
+
+  // However, we return empty content, but with the requested plugin mimetype.
+  write_data(connection, "HTTP/1.0 200 OK\r\n");
+  write_data(connection, "Content-Type: ");
+  write_data(connection, mime_type);
+  write_data(connection, "\r\n\r\n");
+
+  // This dummy data is unused, but must be present or else the reader may hang.
+  write_data(connection, "Data\n");
+}
+
+int main(int argc, char *argv[]) {
+  printf("Chromoting client webserver: http://localhost:%d\n", PORT);
+
+  signal(SIGCHLD, SIG_IGN);
+
+  // Create socket.
+  int sock = socket(AF_INET, SOCK_STREAM, 0);
+  if (sock < 0) {
+    error("Unable to open socket");
+  }
+
+  // Initialize socket address struct.
+  struct sockaddr_in serv_addr;
+  bzero((char*)&serv_addr, sizeof(serv_addr));
+  serv_addr.sin_family = AF_INET;
+  serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+  serv_addr.sin_port = htons(PORT);
+
+  // Bind socket.
+  if (bind(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
+    error("Unable to bind socket");
+  }
+
+  if (listen(sock, 5) < 0) {
+    error("Unable to listen to socket");
+  }
+
+  while (1) {
+    int connection = accept(sock, NULL, NULL);
+    if (connection < 0) {
+      error("Unable to accept connection");
+    }
+
+    pid_t pid = fork();
+    if (pid == 0) {
+      // Child process.
+      if (close(sock) < 0) {
+        error("Unable to close socket in child");
+      }
+
+      // Handle the request.
+      handle_request(connection);
+
+      // Success. Exit to kill child process.
+      exit(0);
+    } else {
+      // Parent process.
+      if (close(connection) < 0) {
+        error("Unable to close connection in parent");
+      }
+    }
+  }
+
+  return 0;
+}