A stack-based critical buffer overflow was found in the way the libresolv library (glibc) performed dual A/AAAA DNS queries. A remote attacker could crash or, potentially, execute code running the library on Linux. How do I patch and protect my server or workstation against the glibc getaddrinfo on Linux operating system? Read more…
The following thread is closed: 133552-howto-linux-multihomed-dns-client (Sorry I am not allowed to post URLs) Therefore I write this append in an own thread. The HOWTO in the referenced thread helped me a lot and I only want to append how to make reverse lookup working for a local zone: The getaddrinfo function is the ANSI version of a function that provides protocol-independent translation from host name to address. The Unicode version of this function is GetAddrInfoW. Developers are encouraged to use the GetAddrInfoW Unicode function rather than the getaddrinfo ANSI function. getnameinfo() is reentrant and allows programs to eliminate IPv4-versus-IPv6 dependencies. The saargument is a pointer to a generic socket address structure (of type sockaddr_inor sockaddr_in6) of size salenthat holds the input IP address and port number. The arguments hostand servare pointers to caller-allocated buffers (of size hostlenand Apr 16, 2020 · The getaddrinfo () and getnameinfo () functions are part of the POSIX standard application programming interface (API) for converting domain name system (DNS) hostnames and IP addresses between their human-readable text representations and structured binary formats for the operating system's networking API.
May 23, 2009 · The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.
getaddrinfo_a(3) - Linux man page Name. Synopsis. Link with -lanl. Description. Perform the look-ups synchronously. The call blocks until the look-ups have completed. Perform the look-ups Return Value. The resources necessary to enqueue the look-up requests were not available. Out of The original node, exactly as passed to the getaddrinfo(3) system call. service. The original service, exactly as passed to the getaddrinfo(3) system call. hints. The original hints, exactly as passed to the getaddrinfo(3) system call. res. The original res, exactly as passed to the getaddrinfo(3) system call. See Also. getaddrinfo(3) network
The getnameinfo() function is the inverse of getaddrinfo(3): it converts a socket address to a corresponding host and service, in a protocol-independent manner. It combines the functionality of gethostbyaddr(3) and getservbyport(3) , but unlike those functions, getnameinfo () is reentrant and allows programs to eliminate IPv4-versus-IPv6
getaddrinfo (3p) - Linux Man Pages PROLOG. This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ NAME. SYNOPSIS. DESCRIPTION. The freeaddrinfo () function shall free one or more addrinfo structures returned by getaddrinfo (), along The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME top getaddrinfo — get address information getaddrinfo (const char *name, const char *service, 2171: const struct addrinfo *hints, struct addrinfo **pai) 2172 {2173: int i = 0, last_i = 0; 2174: int nresults May 12, 2020 · Example of getaddrinfo() program. GitHub Gist: instantly share code, notes, and snippets. If RAI_PASSIVE is specified, the call will resolve address information for use on the passive side of a connection. rdma_getaddrinfo will attempt to resolve the RDMA address, route, and connection data to the given node. The hints parameter, if provided, may be used to The following thread is closed: 133552-howto-linux-multihomed-dns-client (Sorry I am not allowed to post URLs) Therefore I write this append in an own thread. The HOWTO in the referenced thread helped me a lot and I only want to append how to make reverse lookup working for a local zone: