wip on proxy
This commit is contained in:
commit
2f61f2f63f
1 changed files with 668 additions and 0 deletions
668
server.cc
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668
server.cc
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// vim: set ts=2 sw=2 et tw=80:
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#include <cctype>
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#include <arpa/inet.h>
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#include <Magick++.h>
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#include <sys/types.h>
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#include <cstdint>
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#include <sys/socket.h>
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#include <cstring>
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#include <cstdio>
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#include <cstdlib>
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#include <unistd.h>
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#include <pthread.h>
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#include <iostream>
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#include <map>
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#include <vector>
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#include <curl/curl.h>
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#include <netdb.h>
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using namespace std;
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#define MAX_CLIENTS 128
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#define BUFFER 8192
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void* request_thread(void*);
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// Do not kill process when socket connection is broken. Error is already
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// handled
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static void broken_pipe(int signo) {}
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int sock_conn_d;
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// Close socket when shutting down
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static void sigint(int signo) {
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close(sock_conn_d);
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exit(0);
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}
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int main(int argc, char** argv) {
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signal(SIGPIPE, broken_pipe);
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Magick::InitializeMagick(*argv);
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if(argc < 3) {
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fprintf(stderr, "Give port and image_rotation\n");
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exit(255);
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}
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int sock_data_d;
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struct sockaddr_in server;
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if((sock_conn_d = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
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perror("server socket not created");
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exit(1);
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}
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memset(&server, 0, sizeof(server)); // zero the memory
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server.sin_family = AF_INET;
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server.sin_addr.s_addr = inet_addr("0.0.0.0");
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server.sin_port = htons(atoi(argv[1]));
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int reusePort = 1;
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setsockopt(sock_conn_d, SOL_SOCKET, SO_REUSEPORT, &reusePort,
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sizeof(reusePort));
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if(::bind(sock_conn_d, (struct sockaddr*)&server, sizeof(server)) == -1) {
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perror("server socket not bound");
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exit(2);
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}
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while(true) {
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if(listen(sock_conn_d, MAX_CLIENTS) != 0) {
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perror("cannot listen on socket");
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close(sock_conn_d);
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exit(3);
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}
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printf("listening...\n");
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struct sockaddr_in client;
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socklen_t client_len = sizeof(client);
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sock_data_d = accept(sock_conn_d, (struct sockaddr*)&client, &client_len);
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if(sock_data_d == -1) {
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perror("cannot accept client");
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close(sock_conn_d);
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exit(4);
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}
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int* fd = (int*) malloc(sizeof(int));
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if (!fd) {
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perror("thread creation failed");
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exit(1);
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}
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*fd = sock_data_d;
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pthread_t req;
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pthread_create(&req, NULL, request_thread, (void*) fd);
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}
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}
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bool empty_line(FILE* in) {
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char a = fgetc(in), b = fgetc(in);
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if (a == '\r' && b == '\n') {
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return true;
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} else {
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ungetc(b, in);
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ungetc(a, in);
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return false;
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}
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}
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bool parse_headers(FILE* in, map<string, string>& headers) {
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while(true) {
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// probe first two chars to see if body will start
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if (empty_line(in)) {
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break;
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}
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string header_name;
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char c;
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while((c = fgetc(in)) != ':') {
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if (c == EOF || c == '\r' || c == '\n' || !isascii(c)) {
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return false;
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} else {
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header_name += c;
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}
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}
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do {
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c = fgetc(in);
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} while(isspace(c) && c != '\n' && c != '\r');
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ungetc(c, in);
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string value = "";
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do {
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c = fgetc(in);
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value += c;
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} while(c != '\r');
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value.pop_back();
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fgetc(in); // \n
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headers[header_name] = value;
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cout << header_name << ": " << value << endl;
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}
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return true;
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}
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bool has_body(char* method) {
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return !strcmp(method, "POST") || !strcmp(method, "PUT");
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}
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bool is_chunk_start(char* buf) {
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char* i;
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for (i = buf; isdigit(*i); i++);
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if (*i != '\r') return false;
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i++;
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if (*i != '\n') return false;
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i++;
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return *i == '\0';
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}
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bool fetch_body(FILE* in, vector<uint8_t>& body,
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const map<string, string> headers) {
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bool chunked;
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size_t length, r = 0;
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auto p = headers.find("Content-Length");
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chunked = p == headers.end();
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if (!chunked) {
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length = atol(p->second.c_str());
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} else {
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auto q = headers.find("Transfer-Encoding");
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if (q == headers.end() || q->second != "chunked") {
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return false;
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}
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}
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if (!chunked) {
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// read Content-Length bytes
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uint8_t buf[8192];
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const size_t n = atol(p->second.c_str());
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for(size_t w = 0; w < n;) {
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ssize_t r = fread(buf, 1, (n - w) > 8192 ? 8192 : (n - w), in);
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if (r == -1) return false;
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body.insert(end(body), begin(buf), end(buf));
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w += r;
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}
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} else {
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// This was implemented before Prof. Carzaniga said chunked encoding is not
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// required. I am leaving this just because it is already done.
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// Read chunks and search for final chunk 0\r\n\r\n
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char buf[8193];
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bool chunk_start = true;
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while (true) {
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fgets(buf, 8193, in);
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if (!strcmp(buf, "0\r\n") && chunk_start) {
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break;
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}
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if (chunk_start && is_chunk_start(buf)) {
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continue;
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}
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body.insert(end(body), begin(buf), end(buf));
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body.pop_back();
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char b = body.back();
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body.pop_back();
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char a = body.back();
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body.pop_back();
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if (a != '\r' || b != '\n') {
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body.push_back(a);
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body.push_back(b);
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}
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size_t len = strlen(buf);
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chunk_start = len > 2 && buf[len-2] == '\r' && buf[len-1] == '\n';
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}
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body.insert(end(body), begin(buf), end(buf));
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body.push_back(fgetc(in)); // \r
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body.push_back(fgetc(in)); // \n
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}
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return true;
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}
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void send_error(FILE* in, FILE* out, const char* protocol, const int status,
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const string message) {
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const char* msg = message.c_str();
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fprintf(out, "%s %d %s\r\n", protocol, status, msg);
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fprintf(out, "Content-Type: text/html; charset=utf-8\r\n");
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fprintf(out, "Connection: close\r\n");
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cerr << status << ' ' << msg << endl;
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char message_buf[4096];
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message_buf[4095] = '\0';
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snprintf(message_buf, 4095, "<!DOCTYPE html>\n"
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"<html>\n"
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" <head>\n"
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" <meta charset=\"utf-8\"/>\n"
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" <title>%s</title>\n"
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" </head>\n"
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" <body>\n"
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" <h1>%s</h1>\n"
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" </body>\n"
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"</html>\n", msg, msg);
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fprintf(out, "Content-Length: %lu\r\n\r\n", strlen(message_buf));
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fprintf(out, "%s", message_buf);
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fclose(in);
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fflush(out);
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fclose(out);
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pthread_exit(NULL);
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}
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bool set_curl_method(CURL* c, const char* method) {
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if (!strcmp(method, "GET")) {
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curl_easy_setopt(c, CURLOPT_HTTPGET, 1);
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} else if (!strcmp(method, "HEAD")) {
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curl_easy_setopt(c, CURLOPT_HTTPGET, 1);
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curl_easy_setopt(c, CURLOPT_NOBODY, 1);
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} else if (!strcmp(method, "POST")) {
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curl_easy_setopt(c, CURLOPT_POST, 1);
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} else if (!strcmp(method, "PUT")) {
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curl_easy_setopt(c, CURLOPT_PUT, 1);
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} else if (!strcmp(method, "DELETE")) {
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curl_easy_setopt(c, CURLOPT_CUSTOMREQUEST, "DELETE");
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} else {
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//TODO: implement CONNECT method
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return false;
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}
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return true;
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}
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struct buffer {
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size_t size;
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uint8_t* data;
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};
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void buffer_init(struct buffer* self) {
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self->size = 0;
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self->data = (uint8_t*) malloc(8192);
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if (self->data) {
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self->data[0] = 0;
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}
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}
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size_t write_buffer(void *ptr, size_t size, size_t nmemb,
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struct buffer* rbody) {
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size_t index = rbody->size;
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size_t n = size * nmemb;
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rbody->size += n;
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uint8_t* newdata = (uint8_t*) realloc(rbody->data, rbody->size + 1);
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if (!newdata) {
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perror("reallocation of body buffer failed");
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if (rbody->data) free(rbody->data);
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rbody->data = NULL;
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return 0;
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} else {
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rbody->data = newdata;
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}
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memcpy((rbody->data + index), ptr, n);
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rbody->data[rbody->size] = '\0';
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cout << "copy " << n << " size " << rbody->size << endl;
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return size * nmemb;
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}
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// Converts url in a zero-terminated string for the host name. Port is retured
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// as integer, -1 on error
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int find_host_port(char* url) {
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char* i = url;
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size_t c = 0;
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while (*i != ':' && *i != '\0') {
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if (c >= 256 || (!isalnum(*i) && *i != '-' && *i != '.')) return -1;
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i++;
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c++;
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}
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if (c == 0) return -1;
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*i = '\0';
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i++;
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if (*i == '\0') return 80;
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unsigned p;
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if (sscanf(i, "%5u", &p) == 1) {
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return p < 65536 ? p : 80;
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} else {
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return 80;
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}
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}
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struct forward {
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int in;
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int out;
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};
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bool total_write(uint8_t* data, size_t n, int out) {
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for(size_t w = 0; w < n;) {
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ssize_t written = write(out, data + w, n - w);
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if (written == -1) {
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return false;
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}
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w += written;
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}
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return true;
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}
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void* forwarder_thread(void* data) {
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struct forward* f = (struct forward*) data;
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const size_t BUF_SIZE = 65536;
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uint8_t buffer[BUF_SIZE];
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while (true) {
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size_t r = read(f->in, buffer, BUF_SIZE);
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if (r == 0) {
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break;
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}
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if (!total_write(buffer, r, f->out)) {
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cout << "Closing CONNECT forwaredr" << endl;
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return NULL;
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}
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}
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return NULL;
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}
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void handle_connect(FILE* in, FILE* out, const char* protocol, char* url,
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const int fd) {
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int port;
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if ((port = find_host_port(url)) == -1) {
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send_error(in, out, protocol, 500, "Hostname parse error");
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}
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int socketfd = socket(AF_INET, SOCK_STREAM, 0);
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if (socketfd == -1) {
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send_error(in, out, protocol, 500, "TCP socket connection error");
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}
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struct hostent *he = gethostbyname(url);
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if (!he) {
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send_error(in, out, protocol, 404, "Unknown host");
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}
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struct sockaddr_in locale;
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memset (&locale, 0, sizeof(struct sockaddr_in));
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locale.sin_family = AF_INET;
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locale.sin_addr.s_addr = htonl(INADDR_ANY);
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locale.sin_port = htons(0);
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if (::bind(socketfd, (struct sockaddr*) &locale, sizeof(locale)) == -1) {
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send_error(in, out, protocol, 500, "TCP socket connection error");
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}
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struct sockaddr_in remote;
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memset (&remote, 0, sizeof(struct sockaddr_in));
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remote.sin_family = he->h_addrtype;
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memmove(&remote.sin_addr, he->h_addr, he->h_length);
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remote.sin_port = htons((uint16_t) port);
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if (connect(socketfd, (struct sockaddr*) &remote, sizeof(remote)) == -1) {
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send_error(in, out, protocol, 500, "TCP socket connection error");
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}
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struct forward from = { .in = fd, .out = socketfd },
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to = { .in = socketfd, .out = fd };
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fprintf(out, "%s %d %s\r\n\r\n", protocol, 200, "Connection established");
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fflush(out);
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cout << "Connection established" << endl;
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pthread_t ffrom;
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pthread_create(&ffrom, NULL, forwarder_thread, &from);
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forwarder_thread(&to);
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pthread_join(ffrom, NULL);
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}
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struct read_buffer {
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const vector<uint8_t>& body;
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size_t index;
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};
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static size_t read_buffer(void *dest, size_t size, size_t nmemb, void *userp)
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{
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struct read_buffer *wt = (struct read_buffer*) userp;
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size_t buffer_size = size * nmemb;
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size_t remaining = wt->body.size() - wt->index;
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if (buffer_size == wt->body.size()) {
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return 0;
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}
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size_t chunk_len = remaining > buffer_size ? buffer_size : remaining;
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auto start = wt->body.begin() + wt->index;
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copy(start, start + chunk_len, (uint8_t*) dest);
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wt->index += chunk_len;
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return chunk_len;
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}
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void* request_thread(void* data) {
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int fd = *((int*) data);
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FILE* in = fdopen(dup(*((int*) data)), "r");
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FILE* out = fdopen(dup(*((int*) data)), "w");
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free(data);
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while (true) {
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char method[10];
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char url[8000];
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char protocol[10];
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map<string, string> headers;
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vector<uint8_t> body;
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if (fscanf(in, "%10s %8000s %10s\r\n", method, url, protocol) < 3) {
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send_error(in, out, protocol, 400, "Bad request line");
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}
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cout << "METHOD: " << method << " URL: " << url << " PROTOCOL: " << protocol
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<< endl;
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if (!parse_headers(in, headers)) {
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send_error(in, out, protocol, 400, "Malformed header");
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}
|
||||
|
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if (strncmp(url, "http", 4) && strcmp(method, "CONNECT")) {
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send_error(in, out, protocol, 400, "Request line must contain absolute"
|
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" URL (this is a proxy)");
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}
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||||
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cout << "BODY: " << endl;
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||||
|
||||
// check if Content-Length is present and read Content-Length bytes
|
||||
// check if Transfer-Encoding: chunked is present and wait for \r\n on a
|
||||
// line
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||||
|
||||
if (has_body(method)) {
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||||
if (!fetch_body(in, body, headers)) {
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send_error(in, out, protocol, 411,
|
||||
"No Content-Length or Transfer-Encoding");
|
||||
}
|
||||
}
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|
||||
cout << "PARSED" << endl;
|
||||
|
||||
if (!strcmp(method, "CONNECT")) {
|
||||
handle_connect(in, out, protocol, url, fd);
|
||||
break;
|
||||
} else {
|
||||
struct buffer rhead;
|
||||
struct buffer rbody;
|
||||
buffer_init(&rhead);
|
||||
buffer_init(&rbody);
|
||||
|
||||
if(!rhead.data || !rbody.data) {
|
||||
send_error(in, out, protocol, 500, "Failed to allocate response buffer");
|
||||
}
|
||||
|
||||
CURL *curl;
|
||||
curl = curl_easy_init();
|
||||
|
||||
if (!curl) {
|
||||
send_error(in, out, protocol, 500, "Cannot init CURL");
|
||||
}
|
||||
|
||||
if (!set_curl_method(curl, method)) {
|
||||
send_error(in, out, protocol, 405, "Method not implemented");
|
||||
}
|
||||
|
||||
curl_easy_setopt(curl, CURLOPT_URL, url);
|
||||
|
||||
// Delete Proxy-Connection header
|
||||
{
|
||||
auto i = headers.find("Proxy-Connection");
|
||||
if (i != headers.end()) {
|
||||
headers.erase(i);
|
||||
}
|
||||
}
|
||||
|
||||
struct curl_slist *chunk = NULL;
|
||||
for (auto i = headers.begin(); i != headers.end(); i++) {
|
||||
string header = i->first + ": " + i->second;
|
||||
chunk = curl_slist_append(chunk, header.c_str());
|
||||
}
|
||||
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
|
||||
|
||||
if (has_body(method)) {
|
||||
struct read_buffer r = { .body = body, .index = 0 };
|
||||
curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_buffer);
|
||||
curl_easy_setopt(curl, CURLOPT_READDATA, &r);
|
||||
|
||||
chunk = curl_slist_append(chunk, "Transfer-Encoding: chunked");
|
||||
chunk = curl_slist_append(chunk, "Expect:");
|
||||
}
|
||||
|
||||
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, write_buffer);
|
||||
curl_easy_setopt(curl, CURLOPT_HEADERDATA, &rhead);
|
||||
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_buffer);
|
||||
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &rbody);
|
||||
CURLcode res = curl_easy_perform(curl);
|
||||
if(res != CURLE_OK) {
|
||||
fprintf(stderr, "curl_easy_perform() failed: %s\n",
|
||||
curl_easy_strerror(res));
|
||||
send_error(in, out, protocol, 502, "Request to server failed");
|
||||
} else {
|
||||
char protocol_r[10];
|
||||
char message[8000];
|
||||
unsigned code;
|
||||
|
||||
const char* image = NULL;
|
||||
const char* const PNG = "PNG";
|
||||
const char* const JPEG = "JPEG";
|
||||
|
||||
{
|
||||
cout << "RESPONSE: " << endl;
|
||||
FILE* res_head = fmemopen(rhead.data, rhead.size, "r");
|
||||
|
||||
fscanf(res_head, "%10s %3u %8000s\r\n", protocol_r, &code, message);
|
||||
|
||||
cout << "STATUS: " << code << " PROTOCOL: " << protocol_r << endl;
|
||||
|
||||
headers.empty();
|
||||
parse_headers(res_head, headers);
|
||||
|
||||
auto a = headers.find("Content-Type");
|
||||
if (a != headers.end()) {
|
||||
if (a->second == "image/jpeg") image = JPEG;
|
||||
else if (a->second == "image/png") image = PNG;
|
||||
}
|
||||
}
|
||||
|
||||
cout << "image: " << (image ? image : "NULL") << endl;
|
||||
|
||||
|
||||
if (image) {
|
||||
try {
|
||||
Magick::Blob my_blob(rbody.data, rbody.size);
|
||||
Magick::Blob output;
|
||||
|
||||
Magick::Image to_rotate(my_blob);
|
||||
to_rotate.magick(image);
|
||||
to_rotate.flip();
|
||||
to_rotate.write(&output);
|
||||
|
||||
cout << "IN" << endl << my_blob.length() << endl;
|
||||
cout << "OUT" << endl << output.length() << endl;
|
||||
|
||||
fprintf(out, "%s %u %s\n", protocol_r, code, message);
|
||||
cout << protocol_r << ' ' << code << ' ' << message << endl;
|
||||
|
||||
headers["Content-Length"] = to_string(output.length());
|
||||
for (auto i = headers.begin(); i != headers.end(); i++) {
|
||||
string header = i->first + ": " + i->second + "\r\n";
|
||||
fprintf(out, "%s\n", header.c_str());
|
||||
cout << header << endl;
|
||||
}
|
||||
fprintf(out, "\r\n");
|
||||
fflush(out);
|
||||
|
||||
total_write((uint8_t*) output.data(), output.length(), fd);
|
||||
} catch (Magick::Exception &error) {
|
||||
send_error(in, out, protocol, 500, "Image conversion failed");
|
||||
fprintf(stderr, "I exit %s\n", error.what());
|
||||
break;
|
||||
} catch (std::exception &error) {
|
||||
send_error(in, out, protocol, 500, "Image conversion failed");
|
||||
fprintf(stderr, "I exit %s\n", error.what());
|
||||
break;
|
||||
}
|
||||
} else {
|
||||
total_write(rhead.data, rhead.size, fd);
|
||||
total_write(rbody.data, rbody.size, fd);
|
||||
fflush(out);
|
||||
}
|
||||
}
|
||||
|
||||
curl_easy_cleanup(curl);
|
||||
curl_slist_free_all(chunk);
|
||||
free(rhead.data);
|
||||
free(rbody.data);
|
||||
}
|
||||
|
||||
{
|
||||
auto i = headers.find("Connection");
|
||||
if (i != headers.end() && i->second == "close") {
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
cout << "closing data socket...\n";
|
||||
|
||||
fclose(in);
|
||||
|
||||
fflush(out);
|
||||
fclose(out);
|
||||
|
||||
pthread_exit(NULL);
|
||||
}
|
||||
Reference in a new issue