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Diffstat (limited to '')
| -rw-r--r-- | src/util/sane_connect.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/util/sane_connect.c b/src/util/sane_connect.c new file mode 100644 index 0000000..a15204b --- /dev/null +++ b/src/util/sane_connect.c @@ -0,0 +1,65 @@ +/*++ +/* NAME +/* sane_connect 3 +/* SUMMARY +/* sanitize connect() results +/* SYNOPSIS +/* #include <sane_connect.h> +/* +/* int sane_connect(sock, buf, len) +/* int sock; +/* struct sockaddr *buf; +/* SOCKADDR_SIZE *len; +/* DESCRIPTION +/* sane_connect() implements the connect(2) socket call, and maps +/* known harmless error results to EAGAIN. +/* BUGS +/* Bizarre systems may have other harmless error results. Such +/* systems encourage programmers to ignore error results, and +/* penalize programmers who code defensively. +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/*--*/ + +/* System library. */ + +#include "sys_defs.h" +#include <sys/socket.h> +#include <errno.h> + +/* Utility library. */ + +#include "msg.h" +#include "sane_connect.h" + +/* sane_connect - sanitize connect() results */ + +int sane_connect(int sock, struct sockaddr *sa, SOCKADDR_SIZE len) +{ + + /* + * XXX Solaris select() produces false read events, so that read() blocks + * forever on a blocking socket, and fails with EAGAIN on a non-blocking + * socket. Turning on keepalives will fix a blocking socket provided that + * the kernel's keepalive timer expires before the Postfix watchdog + * timer. + * + * XXX Work around NAT induced damage by sending a keepalive before an idle + * connection is expired. This requires that the kernel keepalive timer + * is set to a short time, like 100s. + */ + if (sa->sa_family == AF_INET) { + int on = 1; + + (void) setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, + (void *) &on, sizeof(on)); + } + return (connect(sock, sa, len)); +} |