| # Gaudi Framework, version v21r11 |

Home |  | Generated: 30 Sep 2010

# apmon_utils Namespace Reference

## Functions
bool | urlModified (char *url, char *lastModified) throw (runtime_error)
| Returns true if the page with the specified URL was modified since the last check.
int | httpRequest (char *url, char *reqType, char *temp_filename) throw (runtime_error)
| Performs a HTTP request and puts the result into a temporary file.
char * | findIP (char *address) throw (runtime_error)
| If "address" is a hostname, it returns the corresponding IP address; if "address" is an IP address, it just returns a copy of the address.
void | parse_URL (char *url, char *hostname, int *port, char *identifier) throw (runtime_error)
| Parses an URL and determines the hostname, the port and the file name.
void | freeMat (char **mat, int nRows)
| Frees the memory for a 2-dimensional character array.
char * | trimString (char *s)
| Removes the leading and trailing white spaces from a string and puts the result into a malloc'ed string.
int | xdrSize (int type, char *value)
| Determines the size of the XDR representation for a data item.
int | sizeEval (int type, char *value)
| Determines the size of a data item.
void | logParameters (int level, int nParams, char **paramNames, int *valueTypes, char **paramValues)
| Logs the parameters included in a datagram.
bool | isPrivateAddress (char *addr)
| Verifies whether an IP address is private.
int | getVectIndex (char *item, char **vect, int vectDim)
| Finds the index of a string in a string array.
void | logger (int msgLevel, const char *msg, int newLevel=-1)
| If the newLevel parameter is not specified, log the message given as argument if the current logging level is greater than or equal to msgLevel.

## Function Documentation

char * apmon_utils::findIP | ( | char * | address | ) | throw (runtime_error)

If "address" is a hostname, it returns the corresponding IP address; if "address" is an IP address, it just returns a copy of the address.

Definition at line 244 of file utils.cpp.

    00244                                                             {
    00245   int isIP = 1;
    00246   char *destIP, *s;
    00247   struct in_addr addr;
    00248   unsigned int j;
    00249   bool ipFound;
    00250
    00251   for (j = 0; j < strlen(address); j++)
    00252       if (isalpha(address[j])) {
    00253         // if we found a letter, this is not an IP address
    00254         isIP = 0;
    00255         break;
    00256       }
    00257
    00258     if (!isIP) {  // the user provided a hostname, find the IP
    00259       struct hostent *he = gethostbyname(address);
    00260       if (he == NULL) {
    00261         char tmp_msg[40];
    00262         sprintf(tmp_msg, "[ findIP() ] Invalid destination address %s", address);
    00263         throw runtime_error(tmp_msg);
    00264       }
    00265       j = 0;
    00266       /* get from the list the first IP address
    00267          (which is not a loopback one) */
    00268       ipFound = false;
    00269       while ((he -> h_addr_list)[j] != NULL) {
    00270         memcpy(&(addr.s_addr), (he -> h_addr_list)[j], 4);
    00271         s = inet_ntoa(addr);
    00272         if (strcmp(s, "127.0.0.1") != 0) {
    00273           destIP = strdup(s);
    00274           ipFound = true;
    00275           break;
    00276         }
    00277         j++;
    00278       }
    00279       if (!ipFound) {
    00280         destIP = strdup("127.0.0.1");
    00281         fprintf(stderr, "The destination for datagrams is localhost\n");
    00282       }
    00283
    00284     } else // the string was an IP address
    00285       destIP = strdup(address);
    00286
    00287     return destIP;
    00288 }

void apmon_utils::freeMat | ( | char ** | mat,
|  | int | nRows |
| ) |  |  |

Frees the memory for a 2-dimensional character array.

Parameters:

  | mat | The array to be freed.
  | nRows | The number of rows in the arrray.

Definition at line 336 of file utils.cpp.

    00336                                                {
    00337   int i;
    00338   for (i = 0; i < nRows; i++)
    00339     free(mat[i]);
    00340   free(mat);
    00341 }

int apmon_utils::getVectIndex | ( | char * | item,
|  | char ** | vect,
|  | int | vectDim |
| ) |  |  |

Finds the index of a string in a string array.

Parameters:

  | item | The string that is searched in the array.
  | vect | The string array.
  | vectDim | The number of strings in the array.

Returns:
  The index of the string or -1 if the string is not found.

Definition at line 478 of file utils.cpp.

    00478                                                                   {
    00479   int i;
    00480
    00481   for (i = 0; i < vectDim; i++)
    00482     if (strcmp(item, vect[i]) == 0)
    00483       return i;
    00484   return -1;
    00485 }

int apmon_utils::httpRequest | ( | char * | url,
|  | char * | reqType,
|  | char * | temp_filename |
| ) |  |  | throw (runtime_error)

Performs a HTTP request and puts the result into a temporary file.

Parameters:

  | url | The address of the web page.
  | reqType | The type of the request (GET, POST, HEAD).
  | temp_filename | The name of the temporary file.

Returns:
  The size of the response received from the server, in bytes.

Definition at line 107 of file utils.cpp.

    00108                      {
    00109   // the server from which we get the configuration file
    00110   char hostname[MAX_STRING_LEN];
    00111   // the name of the remote file
    00112   char filename[MAX_STRING_LEN];
    00113   // the port on which the server listens (by default 80)
    00114   int port;
    00115   char msg[MAX_STRING_LEN];
    00116
    00117   int sd, rc;
    00118   // struct sockaddr_in localAddr;
    00119   struct sockaddr_in servAddr;
    00120   struct hostent *h;
    00121   struct timeval optval;
    00122
    00123   char *request; // the HTTP request
    00124
    00125   char buffer[MAX_STRING_LEN]; // for reading from the socket
    00126   int totalSize; // the size of the remote file
    00127   FILE *tmp_file;
    00128
    00129   parse_URL(url, hostname, &port, filename);
    00130
    00131   sprintf(msg, "Sending HTTP %s request to: \n Hostname: %s , Port: %d , Filename: %s",
    00132          reqType, hostname, port, filename);
    00133   logger(INFO, msg);
    00134
    00135   request = (char *)malloc(MAX_STRING_LEN * sizeof(char));
    00136   strcpy(request, reqType);
    00137   strcat(request, " ");
    00138
    00139   request = (char *)strcat( request, filename);
    00140   request = (char *)strcat( request, " HTTP/1.0\r\nHOST: ");
    00141   request = (char *)strcat( request, hostname);
    00142   request = (char *)strcat( request, "\r\n\r\n");
    00143
    00144   h = gethostbyname(hostname);
    00145   if(h==NULL) {
    00146     free(request);
    00147     sprintf(msg,"[ httpRequest() ] Unknown host: %s ", hostname);
    00148     throw runtime_error(msg);
    00149   }
    00150
    00151   servAddr.sin_family = h->h_addrtype;
    00152   memcpy((char *) &servAddr.sin_addr.s_addr, h->h_addr_list[0], h->h_length);
    00153   servAddr.sin_port = htons(port);//(LOCAL_SERVER_PORT);
    00154
    00155   sd = socket(AF_INET, SOCK_STREAM, 0);
    00156   if(sd<0) {
    00157     free(request);
    00158     throw runtime_error(" [ httpRequest() ] Cannot open socket ");
    00159   }
    00160
    00161   /* set connection timeout */
    00162
    00163   optval.tv_sec = 10;
    00164   optval.tv_usec = 0;
    00165   //setsockopt(sd, SOL_SOCKET, SO_SNDTIMEO, (char *) &optval,
    00166   //            sizeof(optval));
    00167   setsockopt(sd, SOL_SOCKET, SO_RCVTIMEO, (char *) &optval,
    00168                         sizeof(optval));
    00169
    00170   /*
    00171   localAddr.sin_family = AF_INET;
    00172   localAddr.sin_addr.s_addr = htonl(INADDR_ANY);
    00173   localAddr.sin_port = htons(0);
    00174
    00175   rc = bind(sd, (struct sockaddr *) &localAddr, sizeof(localAddr));
    00176   if(rc<0) {
    00177     free(request);
    00178     close(sd);
    00179     sprintf(msg, "%s: cannot bind port TCP %u", url,port);
    00180     throw runtime_error(msg);
    00181   }
    00182   */
    00183
    00184   // connect to the server
    00185   rc = connect(sd, (struct sockaddr *) &servAddr, sizeof(servAddr));
    00186   if(rc<0) {
    00187     free(request);
    00188 #ifndef WIN32
    00189     close(sd);
    00190 #else
    00191         closesocket(sd);
    00192 #endif
    00193     throw runtime_error("[ httpRequest() ] Cannot connect to http server");
    00194   }
    00195
    00196   // send the request
    00197   rc = send(sd, request, strlen(request), 0);
    00198   if(rc<0) {
    00199 #ifndef WIN32
    00200         close(sd);
    00201 #else
    00202         closesocket(sd);
    00203 #endif
    00204     free(request);
    00205     throw runtime_error("[ httpRequest() ] Cannot send the request to the http server");
    00206   }
    00207
    00208   free(request);
    00209
    00210   /* read the response and put it in a temporary file */
    00211   tmp_file = fopen(temp_filename, "wb");
    00212   if (tmp_file == NULL) {
    00213 #ifndef WIN32
    00214     close(sd);
    00215 #else
    00216         closesocket(sd);
    00217 #endif
    00218     throw runtime_error("[ httpRequest() ] Unable to open for writing temporary file");
    00219   }
    00220
    00221   rc = 0, totalSize = 0;
    00222   do {
    00223     memset(buffer,0x0,MAX_STRING_LEN);    //  init line
    00224     rc = recv(sd, buffer, MAX_STRING_LEN, 0);
    00225     if( rc > 0) {
    00226       fwrite(buffer, rc, 1, tmp_file);
    00227       totalSize +=rc;
    00228     }
    00229   }while(rc>0);
    00230
    00231   sprintf(msg, "Received response from  %s, response size is %d bytes",
    00232           hostname, totalSize);
    00233   logger(INFO, msg);
    00234
    00235 #ifndef WIN32
    00236   close(sd);
    00237 #else
    00238   closesocket(sd);
    00239 #endif
    00240   fclose(tmp_file);
    00241   return totalSize;
    00242 }

bool apmon_utils::isPrivateAddress | ( | char * | addr | ) |

Verifies whether an IP address is private.

Definition at line 454 of file utils.cpp.

    00454                                              {
    00455   char *s1, *s2;
    00456   int n1, n2;
    00457   char tmp[MAX_STRING_LEN];
    00458 //  char buf[MAX_STRING_LEN];
    00459 //  char *pbuf = buf;
    00460
    00461   strcpy(tmp, addr);
    00462   s1 = strtok/*_r*/(tmp,".");//, &pbuf);
    00463   n1 = atoi(s1);
    00464
    00465   s2 = strtok/*_r*/(NULL, ".");//, &pbuf);
    00466   n2 = atoi(s2);
    00467
    00468   if (n1 == 10)
    00469     return true;
    00470   if (n1 == 172 && n2 >= 16 && n2 <= 31)
    00471     return true;
    00472   if (n1 == 192 && n2 == 168)
    00473     return true;
    00474
    00475   return false;
    00476 }

void apmon_utils::logger | ( | int | msgLevel,
|  | const char * | msg,
|  | int | newLevel = `-1` |
| ) |  |  |

If the newLevel parameter is not specified, log the message given as argument if the current logging level is greater than or equal to msgLevel.

If the newLevel parameter is specified, set the current logging level to newLevel and ignore the first two parameters.

Definition at line 487 of file utils.cpp.

    00487                                                                     {
    00488   char time_s[30];
    00489   int len;
    00490   time_t crtTime = time(NULL);
    00491   char *levels[5] = {(char*)"FATAL",
    00492                      (char*)"WARNING",
    00493                      (char*)"INFO",
    00494                      (char*)"FINE",
    00495                      (char*)"DEBUG"};
    00496   static int loglevel = INFO;
    00497 #ifndef WIN32
    00498   static pthread_mutex_t logger_mutex;
    00499 #else
    00500   static HANDLE logger_mutex;
    00501 #endif
    00502   static bool firstTime = true;
    00503
    00504   if (firstTime) {
    00505 #ifndef WIN32
    00506     pthread_mutex_init(&logger_mutex, NULL);
    00507 #else
    00508         logger_mutex = CreateMutex(NULL, FALSE, NULL);
    00509 #endif
    00510     firstTime = false;
    00511   }
    00512
    00513   pthread_mutex_lock(&logger_mutex);
    00514
    00515 #ifndef WIN32
    00516   char cbuf[50];
    00517   strcpy(time_s, ctime_r(&crtTime, cbuf));
    00518 #else
    00519   strcpy(time_s, ctime(&crtTime));
    00520 #endif
    00521   len = strlen(time_s); time_s[len - 1] = 0;
    00522
    00523   if (newLevel >= 0 && newLevel <=4) {
    00524     loglevel = newLevel;
    00525     if (loglevel>=2)
    00526       printf("[TIME: %s] Changed the logging level to %s\n", time_s, levels[newLevel]);
    00527   } else {
    00528     if (msgLevel >= 0 && msgLevel <= 4) {
    00529       if (msgLevel <= loglevel)
    00530         printf("[TIME: %s] [%s] %s\n",time_s, levels[msgLevel], msg);
    00531     } else
    00532       printf("[WARNING] Invalid logging level %d!\n", msgLevel);
    00533   }
    00534   pthread_mutex_unlock(&logger_mutex);
    00535 }

void apmon_utils::logParameters | ( | int | level,
|  | int | nParams,
|  | char ** | paramNames,
|  | int * | valueTypes,
|  | char ** | paramValues |
| ) |  |  |

Logs the parameters included in a datagram.

Definition at line 421 of file utils.cpp.

    00422                                                           {
    00423   int i;
    00424   char typeNames[][15] = {"XDR_STRING", "", "XDR_INT32", "", "XDR_REAL32",
    00425                  "XDR_REAL64"};
    00426   char logmsg[200], val[100];
    00427
    00428   for (i = 0; i < nParams; i++) {
    00429     if (paramNames[i] == NULL || (valueTypes[i] == XDR_STRING &&
    00430                                   paramValues[i] == NULL))
    00431       continue;
    00432     sprintf(logmsg, "%s (%s) ", paramNames[i], typeNames[valueTypes[i]]);
    00433     //printf("%s () ", paramNames[i]);
    00434     switch(valueTypes[i]) {
    00435     case XDR_STRING:
    00436       sprintf(val, "%s", paramValues[i]);
    00437       break;
    00438     case XDR_INT32:
    00439       sprintf(val, "%d", *(int *)paramValues[i]);
    00440       break;
    00441     case XDR_REAL32:
    00442       sprintf(val, "%f", *(float *)paramValues[i]);
    00443       break;
    00444     case XDR_REAL64:
    00445       sprintf(val, "%f", *(double *)(paramValues[i]));
    00446       break;
    00447     }
    00448     strcat(logmsg, val);
    00449     logger(level, logmsg);
    00450   }
    00451 }

void apmon_utils::parse_URL | ( | char * | url,
|  | char * | hostname,
|  | int * | port,
|  | char * | identifier |
| ) |  |  | throw (runtime_error)

Parses an URL and determines the hostname, the port and the file name.

It is used for the URLs given in the configuration file.

Parameters:

  | url | The URL string.
  | hostname | The determined hostname (this is an output parameter).
  | port | The determined port (also an output parameter).
  | identifier | The determined file name (also an output parameter).

Definition at line 291 of file utils.cpp.

    00292                      {
    00293     char protocol[MAX_STRING_LEN], scratch[MAX_STRING_LEN], *ptr=0, *nptr=0;
    00294     char msg[MAX_STRING_LEN];
    00295
    00296     strcpy(scratch, url);
    00297     ptr = (char *)strchr(scratch, ':');
    00298     if (!ptr)
    00299         throw runtime_error("[ parse_URL() ] Wrong url: no protocol specified");
    00300
    00301     strcpy(ptr, "\0");
    00302     strcpy(protocol, scratch);
    00303     if (strcmp(protocol, "http")) {
    00304         sprintf(msg, "[ parse_URL() ] Wrong protocol in URL: %s", protocol);
    00305         throw runtime_error(msg);
    00306     }
    00307
    00308     strcpy(scratch, url);
    00309     ptr = (char *)strstr(scratch, "//");
    00310     if (!ptr) {
    00311         throw runtime_error("[ parse_URL() ] Wrong url: no server specified");
    00312     }
    00313     ptr += 2;
    00314
    00315     strcpy(hostname, ptr);
    00316     nptr = (char *)strchr(ptr, ':');
    00317     if (!nptr) {
    00318         *port = 80; /* use the default HTTP port number */
    00319         nptr = (char *)strchr(hostname, '/');
    00320     } else {
    00321         sscanf(nptr, ":%d", port);
    00322         nptr = (char *)strchr(hostname, ':');
    00323     }
    00324
    00325     if (nptr)
    00326       *nptr = '\0';
    00327
    00328     nptr = (char *)strchr(ptr, '/');
    00329     if (!nptr) {
    00330         throw runtime_error("[ parse_URL() ] Wrong url: no file specified");
    00331     }
    00332     strcpy(identifier, nptr);
    00333 }

int apmon_utils::sizeEval | ( | int | type,
|  | char * | value |
| ) |  |  |

Determines the size of a data item.

Parameters:

  | type | The type of the data item (see the constants XDR_STRING, XDR_INT32, ... defined above).
  | value | The value of the data item (only used when dealing with strings).

Definition at line 402 of file utils.cpp.

    00402                                                {
    00403
    00404   switch (type) {
    00405 //  case XDR_INT16:
    00406   case XDR_INT32:
    00407   case XDR_REAL32:
    00408     return 4;
    00409 //  case XDR_INT64:
    00410   case XDR_REAL64:
    00411     return 8;
    00412   case XDR_STRING:
    00413     return (strlen(value) + 1);
    00414   }
    00415
    00416   return RET_ERROR;
    00417 }

char * apmon_utils::trimString | ( | char * | s | ) |

Removes the leading and trailing white spaces from a string and puts the result into a malloc'ed string.

Parameters:

  | s | The input string (which is not modified).

Returns:
  The trimmed string.

Definition at line 343 of file utils.cpp.

    00343                                      {
    00344   unsigned int i, j, firstpos, lastpos;
    00345   char *ret = (char *)malloc((strlen(s) + 1) * sizeof(char));
    00346   j = 0;
    00347
    00348   // find the position of the first non-space character in the string
    00349   for (i = 0; i < strlen(s); i++)
    00350     if (!isspace(s[i]))
    00351       break;
    00352   firstpos = i;
    00353
    00354   if (firstpos == strlen(s)) {
    00355     ret[0] = 0;
    00356     return ret;
    00357   }
    00358
    00359   // find the position of the last non-space character in the string
    00360   for (i = strlen(s) ; i > 0; i--)
    00361     if (!isspace(s[i-1]))
    00362         break;
    00363   lastpos = i;
    00364
    00365   for (i = firstpos; i <= lastpos; i++)
    00366       ret[j++] = s[i];
    00367
    00368   ret[j++] = 0;
    00369   return ret;
    00370 }

bool apmon_utils::urlModified | ( | char * | url,
|  | char * | lastModified |
| ) |  |  | throw (runtime_error)

Returns true if the page with the specified URL was modified since the last check.

Parameters:

  | url | The address of the page.
  | lastModified | The "Last-Modified" header that was received last time the page was requested.

Definition at line 42 of file utils.cpp.

    00042                                                                                 {
    00043   char temp_filename[300];
    00044   FILE *tmp_file;
    00045   bool lineFound;
    00046   char line[MAX_STRING_LEN1];
    00047
    00048 #ifndef WIN32
    00049   long mypid = getpid();
    00050 #else
    00051   long mypid = _getpid();
    00052 #endif
    00053
    00054   char str1[100], str2[100];
    00055 #ifndef WIN32
    00056   sprintf(temp_filename, "/tmp/apmon_http%ld", mypid);
    00057 #else
    00058   char *tmp = getenv("TEMP");
    00059   if(tmp == NULL)
    00060           tmp = getenv("TMP");
    00061   if(tmp == NULL)
    00062           tmp = "c:";
    00063   sprintf(temp_filename, "%s\\apmon_http%ld", tmp, mypid);
    00064 #endif
    00065   /* get the HTTP header and put it in a temporary file */
    00066   httpRequest(url, (char*)"HEAD", temp_filename);
    00067
    00068    /* read the header from the temporary file */
    00069   tmp_file = fopen(temp_filename, "rt");
    00070   if (tmp_file == NULL)
    00071     throw runtime_error("[ urlModified() ] Error getting the configuration web page");
    00072
    00073   //line = (char*)malloc(MAX_STRING_LEN * sizeof(char));
    00074
    00075   //check if we got the page correctly
    00076   fgets(line, MAX_STRING_LEN, tmp_file);
    00077   sscanf(line, "%s %s", str1, str2);
    00078   if (atoi(str2) != 200) {
    00079     fclose(tmp_file);
    00080     unlink(temp_filename);
    00081     throw runtime_error("[ urlModified() ] Error getting the configuration web page");
    00082   }
    00083
    00084   // look for the "Last-Modified" line
    00085   lineFound = false;
    00086   while (fgets(line, MAX_STRING_LEN, tmp_file) != NULL) {
    00087     if (strstr(line, "Last-Modified") == line) {
    00088       lineFound = true;
    00089       break;
    00090     }
    00091   }
    00092
    00093   fclose(tmp_file);
    00094   unlink(temp_filename);
    00095   if (lineFound) {
    00096     if (strcmp(line, lastModified) != 0) {
    00097       return true;
    00098     }
    00099     else
    00100       return false;
    00101   } else
    00102     // if the line was not found we must assume the page was modified
    00103     return true;
    00104
    00105 }

int apmon_utils::xdrSize | ( | int | type,
|  | char * | value |
| ) |  |  |

Determines the size of the XDR representation for a data item.

Parameters:

  | type | The type of the data item (see the constants XDR_STRING, XDR_INT32, ... defined above).
  | value | The value of the data item (only used when dealing with strings).

Definition at line 372 of file utils.cpp.

    00372                                               {
    00373   int size;
    00374
    00375   switch (type) {
    00376 //  case XDR_INT16: (not supported)
    00377   case XDR_INT32:
    00378   case XDR_REAL32:
    00379     return 4;
    00380 //  case XDR_INT64:  (not supported)
    00381   case XDR_REAL64:
    00382     return 8;
    00383   case XDR_STRING:
    00384     /* XDR adds 4 bytes to hold the length of the string */
    00385     //size = (strlen(value) + 1) + 4;
    00386     if (value == NULL) {
    00387       logger(WARNING, "[ xdrSize() ] null string argument");
    00388       size = 4;
    00389     } else {
    00390       size = strlen(value) + 4;
    00391       /* the length of the XDR representation must be a multiple of 4,
    00392          so there might be some extra bytes added*/
    00393       if (size % 4 != 0)
    00394         size += (4 - size % 4);
    00395       return size;
    00396     }
    00397   }
    00398
    00399   return RET_ERROR;
    00400 }