Computer Tips - Programming, Cybersecurity and Tech Tutorials

Problem code: if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT , &opt, sizeof(opt)))  {  perror("setsockopt");  exit(EXIT_FAILURE);  } Solution: if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR , &opt, sizeof(opt)))  {  perror("setsockopt");  exit(EXIT_FAILURE);  } Ref.:  https://stackoverflow.com/a/59807281/4064166 This error appears when a socket option is not supported on the current platform. Here the combination of SO_REUSEADDR and SO_REUSEPORT fails because SO_REUSEPORT is unavailable, so the call returns Protocol not available. Setting SO_REUSEADDR on its own fixes it, which is widely supported and enough for the common case of rebinding a recently used address. SO_REUSEPORT behaves differently across operating systems and is not always present.

1. Check if you have enough free storage on iCloud 2. Go to Settings (iOS / iPadOS) or System Preferences (macOS) >> iCloud >> Sign Out 3. Wait for a minute or two after you have successfully logged out 4. Log in to iCloud again 5. Go to iCloud settings and >> iCloud Drive >> Options... >> select the checkbox for "Desktop & Documents Folder" >> Done

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Crypto++ Library is a free C++ class library of cryptographic schemes. Currently the library contains the following algorithms: algorithm type name authenticated encryption schemes GCM, CCM, EAX, ChaCha20Poly1305 and XChaCha20Poly1305 high speed stream ciphers ChaCha (8/12/20), ChaCha (IETF), Panama, Salsa20, Sosemanuk, XSalsa20, XChaCha20 AES and AES candidates AES (Rijndael), RC6, MARS, Twofish, Serpent, CAST-256 ARIA, Blowfish, Camellia, CHAM, HIGHT, IDEA, Kalyna (128/256/512), LEA, SEED, RC5, SHACAL-2, other block ciphers SIMON (64/128), Skipjack, SPECK (64/128), Simeck, SM4, Threefish (256/512/1024), Triple-DES (DES-EDE2 and DES-EDE3), TEA, XTEA block cipher modes of operati...

Steps to check if Intel SGX is enabled on your system: 1. Download test-sgx.c from  https://github.com/ayeks/SGX-hardware 2. % gcc test-sgx.c -o test-sgx 3.  % ./test-sgx eax: 806ea ebx: 4100800 ecx: 7ffafbbf edx: bfebfbff stepping 10 model 14 family 6 processor type 0 extended model 8 extended family 0 smx: 0 Extended feature bits (EAX=07H, ECX=0H) eax: 0 ebx: 29c67af ecx: 0 edx: 9c002600 sgx available: 1 sgx launch control: 0 CPUID Leaf 12H, Sub-Leaf 0 of Intel SGX Capabilities (EAX=12H,ECX=0) eax: 0 ebx: 0 ecx: 0 edx: 0 sgx 1 supported: 0 sgx 2 supported: 0 MaxEnclaveSize_Not64: 0 MaxEnclaveSize_64: 0 CPUID Leaf 12H, Sub-Leaf 1 of Intel SGX Capabilities (EAX=12H,ECX=1) eax: 0 ebx: 0 ecx: 0 edx: 0 CPUID Leaf 12H, Sub-Leaf 2 of Intel SGX Capabilities (EAX=12H,ECX=2) eax: 0 ebx: 0 ecx: 0 edx: 0 CPUID Leaf 12H, Sub-Leaf 3 of Intel SGX Capabilities (EAX=12H,ECX=3) eax: 0 ebx: 0 ecx: 0 edx: 0 CPUID Leaf 12H, Sub-Leaf 4 of Intel SGX Capabilities (EAX=12H,ECX=4) eax: 0 ebx: 0 ...

Apple iOS Google Android Released July 29, 2007 September 23, 2008 Latest Version 14 11 Website https://www.apple.com/ios/ios-14/ https://www.android.com/ OS Model Proprietary Open Source Languages 40 100 Assistant Siri Google Assistant Apps 1,000,000 on App Store 2,000,000 on Play Store Operating System Unix Linux Latest Phone iPhone 12 Pixel 5 Phone Website https://www.apple.com/iphone https://store.google.com/product/pixel_5 Let's compare some of the default apps on both platforms...

Including necessary files Use appropriate namespace Set simulation time resolution Enable logging for different modules Creating codes Create net devices with MAC and PHY Attach Net devices to nodes and set interconnections Install protocol stack in nodes Set network address for interfaces Setup routing Install applications in nodes Setup tracing Set application start and stop time Set simulation start time Run simulation Release resources at end of the simulation source:  https://ns3tutorial.com/ns3-tutorial/ This is a checklist of the steps for writing a simulation script in ns-3, the discrete event network simulator, from including headers and setting the time resolution to creating nodes and devices and installing the protocol stack. Following the steps in order matters because each stage depends on the previous one, for example installing the internet stack before assigning addresses. It is a helpful map when starting a new ns-3 scenario.