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 int 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     // request info is NULL; we have no info about the connection
  77     return -EINVAL;
  78   }
  79
  80   for (int i = 0; i < info->num_headers; i++) {
  81     const struct mg_request_info::mg_header* header = &info->http_headers[i];
  82
  83     if (header->name == nullptr || header->value==nullptr) {
  84       lderr(cct) << "client supplied malformatted headers" << dendl;
  85       return -EINVAL;
  86     }
  87
  88     const boost::string_ref name(header->name);
  89     const auto& value = header->value;
  90
  91     if (boost::algorithm::iequals(name, "content-length")) {
  92       env.set("CONTENT_LENGTH", value);
  93       continue;
  94     }
  95     if (boost::algorithm::iequals(name, "content-type")) {
  96       env.set("CONTENT_TYPE", value);
  97       continue;
  98     }
  99     if (boost::algorithm::iequals(name, "connection")) {
 100       explicit_keepalive = boost::algorithm::iequals(value, "keep-alive");
 101       explicit_conn_close = boost::algorithm::iequals(value, "close");
 102     }
 103
 104     static const boost::string_ref HTTP_{"HTTP_"};
 105
 106     char buf[name.size() + HTTP_.size() + 1];
 107     auto dest = std::copy(std::begin(HTTP_), std::end(HTTP_), buf);
 108     for (auto src = name.begin(); src != name.end(); ++src, ++dest) {
 109       if (*src == '-') {
 110         *dest = '_';
 111       } else {
 112         *dest = std::toupper(*src);
 113       }
 114     }
 115     *dest = '\0';
 116
 117     env.set(buf, value);
 118   }
 119
 120   env.set("REMOTE_ADDR", info->remote_addr);
 121   env.set("REQUEST_METHOD", info->request_method);
 122   env.set("HTTP_VERSION", info->http_version);
 123   env.set("REQUEST_URI", info->request_uri); // get the full uri, we anyway handle abs uris later
 124   env.set("SCRIPT_URI", info->uri); /* FIXME */
 125   if (info->query_string) {
 126     env.set("QUERY_STRING", info->query_string);
 127   }
 128   if (info->remote_user) {
 129     env.set("REMOTE_USER", info->remote_user);
 130   }
 131
 132   if (port <= 0)
 133     lderr(cct) << "init_env: bug: invalid port number" << dendl;
 134   char port_buf[16];
 135   snprintf(port_buf, sizeof(port_buf), "%d", port);
 136   env.set("SERVER_PORT", port_buf);
 137   if (info->is_ssl) {
 138     env.set("SERVER_PORT_SECURE", port_buf);
 139   }
 140   return 0;
 141 }
 142
 143 size_t RGWCivetWeb::send_status(int status, const char *status_name)
 144 {
 145   mg_set_http_status(conn, status);
 146
 147   static constexpr size_t STATUS_BUF_SIZE = 128;
 148
 149   char statusbuf[STATUS_BUF_SIZE];
 150   const auto statuslen = snprintf(statusbuf, sizeof(statusbuf),
 151                                   "HTTP/1.1 %d %s\r\n", status, status_name);
 152
 153   return txbuf.sputn(statusbuf, statuslen);
 154 }
 155
 156 size_t RGWCivetWeb::send_100_continue()
 157 {
 158   const char HTTTP_100_CONTINUE[] = "HTTP/1.1 100 CONTINUE\r\n\r\n";
 159   const size_t sent = txbuf.sputn(HTTTP_100_CONTINUE,
 160                                   sizeof(HTTTP_100_CONTINUE) - 1);
 161   flush();
 162   return sent;
 163 }
 164
 165 size_t RGWCivetWeb::send_header(const boost::string_ref& name,
 166                                 const boost::string_ref& value)
 167 {
 168   static constexpr char HEADER_SEP[] = ": ";
 169   static constexpr char HEADER_END[] = "\r\n";
 170
 171   size_t sent = 0;
 172
 173   sent += txbuf.sputn(name.data(), name.length());
 174   sent += txbuf.sputn(HEADER_SEP, sizeof(HEADER_SEP) - 1);
 175   sent += txbuf.sputn(value.data(), value.length());
 176   sent += txbuf.sputn(HEADER_END, sizeof(HEADER_END) - 1);
 177
 178   return sent;
 179 }
 180
 181 size_t RGWCivetWeb::dump_date_header()
 182 {
 183   char timestr[TIME_BUF_SIZE];
 184
 185   const time_t gtime = time(nullptr);
 186   struct tm result;
 187   struct tm const* const tmp = gmtime_r(&gtime, &result);
 188
 189   if (nullptr == tmp) {
 190     return 0;
 191   }
 192
 193   if (! strftime(timestr, sizeof(timestr),
 194                  "Date: %a, %d %b %Y %H:%M:%S %Z\r\n", tmp)) {
 195     return 0;
 196   }
 197
 198   return txbuf.sputn(timestr, strlen(timestr));
 199 }
 200
 201 size_t RGWCivetWeb::complete_header()
 202 {
 203   size_t sent = dump_date_header();
 204
 205   if (explicit_keepalive) {
 206     constexpr char CONN_KEEP_ALIVE[] = "Connection: Keep-Alive\r\n";
 207     sent += txbuf.sputn(CONN_KEEP_ALIVE, sizeof(CONN_KEEP_ALIVE) - 1);
 208   } else if (explicit_conn_close) {
 209     constexpr char CONN_KEEP_CLOSE[] = "Connection: close\r\n";
 210     sent += txbuf.sputn(CONN_KEEP_CLOSE, sizeof(CONN_KEEP_CLOSE) - 1);
 211   }
 212
 213   static constexpr char HEADER_END[] = "\r\n";
 214   sent += txbuf.sputn(HEADER_END, sizeof(HEADER_END) - 1);
 215
 216   flush();
 217   return sent;
 218 }
 219
 220 size_t RGWCivetWeb::send_content_length(uint64_t len)
 221 {
 222   static constexpr size_t CONLEN_BUF_SIZE = 128;
 223
 224   char sizebuf[CONLEN_BUF_SIZE];
 225   const auto sizelen = snprintf(sizebuf, sizeof(sizebuf),
 226                                 "Content-Length: %" PRIu64 "\r\n", len);
 227   return txbuf.sputn(sizebuf, sizelen);
 228 }