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Add support for abstract Unix-domain sockets
This is a variant of the normal Unix-domain sockets that don't use the file system but a separate "abstract" namespace. At the user interface, such sockets are represented by names starting with "@". Supported on Linux and Windows right now. Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://www.postgresql.org/message-id/flat/6dee8574-b0ad-fc49-9c8c-2edc796f0033@2ndquadrant.com
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@ -217,6 +217,21 @@ getaddrinfo_unix(const char *path, const struct addrinfo *hintsp,
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strcpy(unp->sun_path, path);
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/*
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* If the supplied path starts with @, replace that with a zero byte for
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* the internal representation. In that mode, the entire sun_path is the
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* address, including trailing zero bytes. But we set the address length
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* to only include the length of the original string. That way the
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* trailing zero bytes won't show up in any network or socket lists of the
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* operating system. This is just a convention, also followed by other
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* packages.
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*/
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if (path[0] == '@')
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{
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unp->sun_path[0] = '\0';
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aip->ai_addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(path);
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}
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#ifdef HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN
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unp->sun_len = sizeof(struct sockaddr_un);
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#endif
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@ -249,7 +264,14 @@ getnameinfo_unix(const struct sockaddr_un *sa, int salen,
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if (service)
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{
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ret = snprintf(service, servicelen, "%s", sa->sun_path);
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/*
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* Check whether it looks like an abstract socket, but it could also
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* just be an empty string.
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*/
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if (sa->sun_path[0] == '\0' && sa->sun_path[1] != '\0')
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ret = snprintf(service, servicelen, "@%s", sa->sun_path + 1);
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else
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ret = snprintf(service, servicelen, "%s", sa->sun_path);
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if (ret < 0 || ret >= servicelen)
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return EAI_MEMORY;
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}
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