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libpq: Allow connection strings and URIs to specify multiple hosts.

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It's also possible to specify a separate port for each host.

Previously, we'd loop over every address returned by looking up the
host name; now, we'll try every address for every host name.

Patch by me.  Victor Wagner wrote an earlier patch for this feature,
which I read, but I didn't use any of his code.  Review by Mithun Cy.
This commit is contained in:
Robert Haas
2016-11-03 09:25:20 -04:00
parent 770671062f
commit 274bb2b385
4 changed files with 515 additions and 217 deletions
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28
src/interfaces/libpq/fe-auth.c
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@ -683,20 +683,26 @@ pg_fe_sendauth(AuthRequest areq, PGconn *conn)
case AUTH_REQ_MD5:
case AUTH_REQ_PASSWORD:
conn->password_needed = true;
if (conn->pgpass == NULL || conn->pgpass[0] == '\0')
{
printfPQExpBuffer(&conn->errorMessage,
PQnoPasswordSupplied);
return STATUS_ERROR;
}
if (pg_password_sendauth(conn, conn->pgpass, areq) != STATUS_OK)
{
printfPQExpBuffer(&conn->errorMessage,
char *password = conn->connhost[conn->whichhost].password;
if (password == NULL)
password = conn->pgpass;
conn->password_needed = true;
if (password == NULL || password[0] == '\0')
{
printfPQExpBuffer(&conn->errorMessage,
PQnoPasswordSupplied);
return STATUS_ERROR;
}
if (pg_password_sendauth(conn, password, areq) != STATUS_OK)
{
printfPQExpBuffer(&conn->errorMessage,
"fe_sendauth: error sending password authentication\n");
return STATUS_ERROR;
return STATUS_ERROR;
}
break;
}
break;
case AUTH_REQ_SCM_CREDS:
if (pg_local_sendauth(conn) != STATUS_OK)