ceph/src/rgw/rgw_civetweb.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include <string.h>
   5
   6 #include <boost/algorithm/string/predicate.hpp>
   7 #include <boost/utility/string_ref.hpp>
   8
   9 #include "civetweb/civetweb.h"
  10 #include "rgw_civetweb.h"
  11
  12
  13 #define dout_subsys ceph_subsys_rgw
  14
  15 size_t RGWCivetWeb::write_data(const char *buf, const size_t len)
  16 {
  17   auto to_sent = len;
  18   while (to_sent) {
  19     const int ret = mg_write(conn, buf, len);
  20     if (ret < 0 || ! ret) {
  21       /* According to the documentation of mg_write() it always returns -1 on
  22        * error. The details aren't available, so we will just throw EIO. Same
  23        * goes to 0 that is associated with writing to a closed connection. */
  24       throw rgw::io::Exception(EIO, std::system_category());
  25     } else {
  26       to_sent -= static_cast<size_t>(ret);
  27     }
  28   }
  29   return len;
  30 }
  31
  32 RGWCivetWeb::RGWCivetWeb(mg_connection* const conn)
  33   : conn(conn),
  34     explicit_keepalive(false),
  35     explicit_conn_close(false),
  36     txbuf(*this)
  37 {
  38     sockaddr *lsa = mg_get_local_addr(conn);
  39     switch(lsa->sa_family) {
  40     case AF_INET:
  41         port = ntohs(((struct sockaddr_in*)lsa)->sin_port);
  42         break;
  43     case AF_INET6:
  44         port = ntohs(((struct sockaddr_in6*)lsa)->sin6_port);
  45         break;
  46     default:
  47         port = -1;
  48     }
  49 }
  50
  51 size_t RGWCivetWeb::read_data(char *buf, size_t len)
  52 {
  53   const int ret = mg_read(conn, buf, len);
  54   if (ret < 0) {
  55     throw rgw::io::Exception(EIO, std::system_category());
  56   }
  57   return ret;
  58 }
  59
  60 void RGWCivetWeb::flush()
  61 {
  62   txbuf.pubsync();
  63 }
  64
  65 size_t RGWCivetWeb::complete_request()
  66 {
  67   return 0;
  68 }
  69
  70 void RGWCivetWeb::init_env(CephContext *cct)
  71 {
  72   env.init(cct);
  73   const struct mg_request_info* info = mg_get_request_info(conn);
  74
  75   if (! info) {
  76     return;
  77   }
  78
  79   for (int i = 0; i < info->num_headers; i++) {
  80     const struct mg_request_info::mg_header* header = &info->http_headers[i];
  81     const boost::string_ref name(header->name);
  82     const auto& value = header->value;
  83
  84     if (boost::algorithm::iequals(name, "content-length")) {
  85       env.set("CONTENT_LENGTH", value);
  86       continue;
  87     }
  88     if (boost::algorithm::iequals(name, "content-type")) {
  89       env.set("CONTENT_TYPE", value);
  90       continue;
  91     }
  92     if (boost::algorithm::iequals(name, "connection")) {
  93       explicit_keepalive = boost::algorithm::iequals(value, "keep-alive");
  94       explicit_conn_close = boost::algorithm::iequals(value, "close");
  95     }
  96
  97     static const boost::string_ref HTTP_{"HTTP_"};
  98
  99     char buf[name.size() + HTTP_.size() + 1];
 100     auto dest = std::copy(std::begin(HTTP_), std::end(HTTP_), buf);
 101     for (auto src = name.begin(); src != name.end(); ++src, ++dest) {
 102       if (*src == '-') {
 103         *dest = '_';
 104       } else {
 105         *dest = std::toupper(*src);
 106       }
 107     }
 108     *dest = '\0';
 109
 110     env.set(buf, value);
 111   }
 112
 113   env.set("REQUEST_METHOD", info->request_method);
 114   env.set("REQUEST_URI", info->request_uri); // get the full uri, we anyway handle abs uris later
 115   env.set("SCRIPT_URI", info->uri); /* FIXME */
 116   if (info->query_string) {
 117     env.set("QUERY_STRING", info->query_string);
 118   }
 119   if (info->remote_user) {
 120     env.set("REMOTE_USER", info->remote_user);
 121   }
 122
 123   if (port <= 0)
 124     lderr(cct) << "init_env: bug: invalid port number" << dendl;
 125   char port_buf[16];
 126   snprintf(port_buf, sizeof(port_buf), "%d", port);
 127   env.set("SERVER_PORT", port_buf);
 128   if (info->is_ssl) {
 129     env.set("SERVER_PORT_SECURE", port_buf);
 130   }
 131 }
 132
 133 size_t RGWCivetWeb::send_status(int status, const char *status_name)
 134 {
 135   mg_set_http_status(conn, status);
 136
 137   static constexpr size_t STATUS_BUF_SIZE = 128;
 138
 139   char statusbuf[STATUS_BUF_SIZE];
 140   const auto statuslen = snprintf(statusbuf, sizeof(statusbuf),
 141                                   "HTTP/1.1 %d %s\r\n", status, status_name);
 142
 143   return txbuf.sputn(statusbuf, statuslen);
 144 }
 145
 146 size_t RGWCivetWeb::send_100_continue()
 147 {
 148   const char HTTTP_100_CONTINUE[] = "HTTP/1.1 100 CONTINUE\r\n\r\n";
 149   const size_t sent = txbuf.sputn(HTTTP_100_CONTINUE,
 150                                   sizeof(HTTTP_100_CONTINUE) - 1);
 151   flush();
 152   return sent;
 153 }
 154
 155 size_t RGWCivetWeb::send_header(const boost::string_ref& name,
 156                                 const boost::string_ref& value)
 157 {
 158   static constexpr char HEADER_SEP[] = ": ";
 159   static constexpr char HEADER_END[] = "\r\n";
 160
 161   size_t sent = 0;
 162
 163   sent += txbuf.sputn(name.data(), name.length());
 164   sent += txbuf.sputn(HEADER_SEP, sizeof(HEADER_SEP) - 1);
 165   sent += txbuf.sputn(value.data(), value.length());
 166   sent += txbuf.sputn(HEADER_END, sizeof(HEADER_END) - 1);
 167
 168   return sent;
 169 }
 170
 171 size_t RGWCivetWeb::dump_date_header()
 172 {
 173   char timestr[TIME_BUF_SIZE];
 174
 175   const time_t gtime = time(nullptr);
 176   struct tm result;
 177   struct tm const* const tmp = gmtime_r(&gtime, &result);
 178
 179   if (nullptr == tmp) {
 180     return 0;
 181   }
 182
 183   if (! strftime(timestr, sizeof(timestr),
 184                  "Date: %a, %d %b %Y %H:%M:%S %Z\r\n", tmp)) {
 185     return 0;
 186   }
 187
 188   return txbuf.sputn(timestr, strlen(timestr));
 189 }
 190
 191 size_t RGWCivetWeb::complete_header()
 192 {
 193   size_t sent = dump_date_header();
 194
 195   if (explicit_keepalive) {
 196     constexpr char CONN_KEEP_ALIVE[] = "Connection: Keep-Alive\r\n";
 197     sent += txbuf.sputn(CONN_KEEP_ALIVE, sizeof(CONN_KEEP_ALIVE) - 1);
 198   } else if (explicit_conn_close) {
 199     constexpr char CONN_KEEP_CLOSE[] = "Connection: close\r\n";
 200     sent += txbuf.sputn(CONN_KEEP_CLOSE, sizeof(CONN_KEEP_CLOSE) - 1);
 201   }
 202
 203   static constexpr char HEADER_END[] = "\r\n";
 204   sent += txbuf.sputn(HEADER_END, sizeof(HEADER_END) - 1);
 205
 206   flush();
 207   return sent;
 208 }
 209
 210 size_t RGWCivetWeb::send_content_length(uint64_t len)
 211 {
 212   static constexpr size_t CONLEN_BUF_SIZE = 128;
 213
 214   char sizebuf[CONLEN_BUF_SIZE];
 215   const auto sizelen = snprintf(sizebuf, sizeof(sizebuf),
 216                                 "Content-Length: %" PRIu64 "\r\n", len);
 217   return txbuf.sputn(sizebuf, sizelen);
 218 }