start mqtt client (based on paho.mqtt.c), basically works
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231
3rd/paho.mqtt.c/src/MQTTVersion.c
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231
3rd/paho.mqtt.c/src/MQTTVersion.c
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/*******************************************************************************
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* Copyright (c) 2012, 2025 IBM Corp.
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*
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v2.0
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* and Eclipse Distribution License v1.0 which accompany this distribution.
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*
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* The Eclipse Public License is available at
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* https://www.eclipse.org/legal/epl-2.0/
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* and the Eclipse Distribution License is available at
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* http://www.eclipse.org/org/documents/edl-v10.php.
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*
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* Contributors:
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* Ian Craggs - initial API and implementation and/or initial documentation
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*******************************************************************************/
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#include <stdio.h>
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#if !defined(_WRS_KERNEL)
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <ctype.h>
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#include "MQTTAsync.h"
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#if defined(_WIN32)
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#include <windows.h>
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#include <tchar.h>
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#include <io.h>
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#include <sys/stat.h>
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#define snprintf _snprintf
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#else
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#include <dlfcn.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#endif
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/**
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*
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* @file
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* \brief MQTTVersion - display the version and build information strings for a library.
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*
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* With no arguments, we try to load and call the version string for the libraries we
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* know about: mqttv3c, mqttv3cs, mqttv3a, mqttv3as.
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* With an argument:
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* 1) we try to load the named library, call getVersionInfo and display those values.
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* 2) If that doesn't work, we look through the binary for eyecatchers, and display those.
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* This will work if the library is not executable in the current environment.
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*
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* */
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static const char* libraries[] = {"paho-mqtt3c", "paho-mqtt3cs", "paho-mqtt3a", "paho-mqtt3as"};
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static const char* eyecatchers[] = {"MQTTAsyncV3_Version", "MQTTAsyncV3_Timestamp",
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"MQTTClientV3_Version", "MQTTClientV3_Timestamp"};
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char* FindString(char* filename, const char* eyecatcher_input);
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int printVersionInfo(MQTTAsync_nameValue* info);
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int loadandcall(const char* libname);
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void printEyecatchers(char* filename);
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/**
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* Finds an eyecatcher in a binary file and returns the following value.
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* @param filename the name of the file
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* @param eyecatcher_input the eyecatcher string to look for
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* @return the value found - "" if not found
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*/
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char* FindString(char* filename, const char* eyecatcher_input)
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{
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FILE* infile = NULL;
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static char value[100];
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const char* eyecatcher = eyecatcher_input;
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memset(value, 0, 100);
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if ((infile = fopen(filename, "rb")) != NULL)
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{
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size_t buflen = strlen(eyecatcher);
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char* buffer = (char*) malloc(buflen + 1); /* added space for unused null terminator to stop LGTM complaint */
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if (buffer != NULL)
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{
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int c = fgetc(infile);
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while (feof(infile) == 0)
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{
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int count = 0;
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buffer[count++] = c;
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if (memcmp(eyecatcher, buffer, buflen) == 0)
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{
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char* ptr = value;
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c = fgetc(infile); /* skip space */
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c = fgetc(infile);
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while (isprint((unsigned char)c))
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{
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*ptr++ = c;
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c = fgetc(infile);
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}
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break;
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}
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if (count == buflen)
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{
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memmove(buffer, &buffer[1], buflen - 1);
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count--;
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}
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c = fgetc(infile);
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}
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free(buffer);
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}
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fclose(infile);
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}
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return value;
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}
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int printVersionInfo(MQTTAsync_nameValue* info)
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{
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int rc = 0;
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while (info->name)
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{
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printf("%s: %s\n", info->name, info->value);
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info++;
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rc = 1; /* at least one value printed */
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}
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return rc;
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}
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typedef MQTTAsync_nameValue* (*func_type)(void);
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int loadandcall(const char* libname)
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{
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int rc = 0;
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MQTTAsync_nameValue* (*func_address)(void) = NULL;
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#if defined(_WIN32)
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HMODULE APILibrary = LoadLibraryA(libname);
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if (APILibrary == NULL)
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printf("Error loading library %s, error code %d\n", libname, GetLastError());
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else
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{
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func_address = (func_type)GetProcAddress(APILibrary, "MQTTAsync_getVersionInfo");
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if (func_address == NULL)
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func_address = (func_type)GetProcAddress(APILibrary, "MQTTClient_getVersionInfo");
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if (func_address)
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rc = printVersionInfo((*func_address)());
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FreeLibrary(APILibrary);
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}
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#else
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void* APILibrary = dlopen(libname, RTLD_LAZY); /* Open the Library in question */
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if (APILibrary == NULL)
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printf("Error loading library %s, error %s\n", libname, dlerror());
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else
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{
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*(void **) (&func_address) = dlsym(APILibrary, "MQTTAsync_getVersionInfo");
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if (func_address == NULL)
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func_address = dlsym(APILibrary, "MQTTClient_getVersionInfo");
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if (func_address)
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rc = printVersionInfo((*func_address)());
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dlclose(APILibrary);
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}
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#endif
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return rc;
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}
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#if !defined(ARRAY_SIZE)
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#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
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#endif
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void printEyecatchers(char* filename)
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{
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int i = 0;
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for (i = 0; i < ARRAY_SIZE(eyecatchers); ++i)
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{
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char* value = FindString(filename, eyecatchers[i]);
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if (value[0])
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printf("%s: %s\n", eyecatchers[i], value);
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}
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}
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int main(int argc, char** argv)
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{
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printf("MQTTVersion: print the version strings of an MQTT client library\n");
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printf("Copyright (c) 2012, 2018 IBM Corp.\n");
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if (argc == 1)
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{
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int i = 0;
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char namebuf[60];
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printf("Specify a particular library name if it is not in the current directory, or not executable on this platform\n");
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for (i = 0; i < ARRAY_SIZE(libraries); ++i)
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{
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#if defined(__CYGWIN__)
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snprintf(namebuf, sizeof(namebuf), "cyg%s-1.dll", libraries[i]);
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#elif defined(_WIN32)
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snprintf(namebuf, sizeof(namebuf), "%s.dll", libraries[i]);
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#elif defined(OSX)
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snprintf(namebuf, sizeof(namebuf), "lib%s.1.dylib", libraries[i]);
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#else
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snprintf(namebuf, sizeof(namebuf), "lib%s.so.1", libraries[i]);
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#endif
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printf("--- Trying library %s ---\n", libraries[i]);
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if (!loadandcall(namebuf))
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printEyecatchers(namebuf);
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}
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}
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else
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{
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if (!loadandcall(argv[1]))
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printEyecatchers(argv[1]);
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}
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return 0;
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}
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#else
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int main(void)
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{
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fprintf(stderr, "This tool is not supported on this platform yet.\n");
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return 1;
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}
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#endif /* !defined(_WRS_KERNEL) */
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