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Add support for abstract Unix-domain sockets

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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
This commit is contained in:
Peter Eisentraut
2020-11-25 08:14:23 +01:00
parent a7e65dc88b
commit c9f0624bc2
8 changed files with 76 additions and 16 deletions
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24
src/common/ip.c
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@ -217,6 +217,21 @@ getaddrinfo_unix(const char *path, const struct addrinfo *hintsp,
strcpy(unp->sun_path, path);
/*
* If the supplied path starts with @, replace that with a zero byte for
* the internal representation. In that mode, the entire sun_path is the
* address, including trailing zero bytes. But we set the address length
* to only include the length of the original string. That way the
* trailing zero bytes won't show up in any network or socket lists of the
* operating system. This is just a convention, also followed by other
* packages.
*/
if (path[0] == '@')
{
unp->sun_path[0] = '\0';
aip->ai_addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(path);
}
#ifdef HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN
unp->sun_len = sizeof(struct sockaddr_un);
#endif
@ -249,7 +264,14 @@ getnameinfo_unix(const struct sockaddr_un *sa, int salen,
if (service)
{
ret = snprintf(service, servicelen, "%s", sa->sun_path);
/*
* Check whether it looks like an abstract socket, but it could also
* just be an empty string.
*/
if (sa->sun_path[0] == '\0' && sa->sun_path[1] != '\0')
ret = snprintf(service, servicelen, "@%s", sa->sun_path + 1);
else
ret = snprintf(service, servicelen, "%s", sa->sun_path);
if (ret < 0 || ret >= servicelen)
return EAI_MEMORY;
}