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authorDave Reisner <dreisner@archlinux.org>2012-01-21 21:31:39 -0500
committerDan McGee <dan@archlinux.org>2012-01-23 12:14:58 -0600
commit44f146f232be5203fb01ad35fdf73122838df97c (patch)
treeebf99d8f46d91fe3f9f2c383e97c8b2dbb7b0bc2
parentedd4276bbf3d21a7353e3d67ce6639246ef8032d (diff)
lib/dload: enforce usage of TCP keepalives
This is particularly important in the case of FTP control connections, which may be closed by rogue NAT/firewall devices detecting idle connections on larger transfers which may take 5-10+ minutes. Signed-off-by: Dave Reisner <dreisner@archlinux.org> Signed-off-by: Dan McGee <dan@archlinux.org>
-rw-r--r--configure.ac3
-rw-r--r--lib/libalpm/dload.c53
2 files changed, 55 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index a8b142ea..0bf11e99 100644
--- a/configure.ac
+++ b/configure.ac
@@ -173,7 +173,8 @@ AM_CONDITIONAL([HAVE_LIBGPGME], [test "x$with_gpgme" = "xyes"])
# Checks for header files.
AC_CHECK_HEADERS([fcntl.h float.h glob.h libintl.h limits.h locale.h \
- mntent.h stddef.h string.h sys/ioctl.h \
+ mntent.h netinet/in.h netinet/tcp.h \
+ stddef.h string.h sys/ioctl.h \
sys/mnttab.h sys/mount.h \
sys/param.h sys/statvfs.h sys/time.h sys/types.h \
sys/ucred.h syslog.h termios.h wchar.h])
diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c
index 6fe4a323..f5af7c64 100644
--- a/lib/libalpm/dload.c
+++ b/lib/libalpm/dload.c
@@ -25,11 +25,19 @@
#include <errno.h>
#include <string.h>
#include <unistd.h>
+#include <sys/socket.h> /* setsockopt, SO_KEEPALIVE */
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h> /* IPPROTO_TCP */
+#endif
+#ifdef HAVE_NETINET_TCP_H
+#include <netinet/tcp.h> /* TCP_KEEPINTVL, TCP_KEEPIDLE */
+#endif
+
#ifdef HAVE_LIBCURL
#include <curl/curl.h>
#endif
@@ -217,6 +225,47 @@ static size_t parse_headers(void *ptr, size_t size, size_t nmemb, void *user)
return realsize;
}
+static int dload_sockopt_cb(void *userdata, curl_socket_t curlfd,
+ curlsocktype purpose)
+{
+ alpm_handle_t *handle = userdata;
+ int optval = 1;
+
+ /* this whole method is to prevent FTP control connections from going sour
+ * during a long data transfer; crappy firewalls love to drop otherwise idle
+ * connections if there is no traffic. */
+ if(purpose != CURLSOCKTYPE_IPCXN) {
+ return 0;
+ }
+
+ /* don't abort operation if any setsockopt fails, just log to debug */
+ if(setsockopt(curlfd, SOL_SOCKET, SO_KEEPALIVE, (void *)&optval,
+ sizeof(optval)) < 0) {
+ _alpm_log(handle, ALPM_LOG_DEBUG,
+ "Failed to set SO_KEEPALIVE on fd %d\n", curlfd);
+ }
+ else {
+#ifdef TCP_KEEPIDLE
+ optval = 60;
+ if(setsockopt(curlfd, IPPROTO_TCP, TCP_KEEPIDLE, (void *)&optval,
+ sizeof(optval)) < 0) {
+ _alpm_log(handle, ALPM_LOG_DEBUG,
+ "Failed to set TCP_KEEPIDLE on fd %d\n", curlfd);
+ }
+#endif
+#ifdef TCP_KEEPINTVL
+ optval = 60;
+ if(setsockopt(curlfd, IPPROTO_TCP, TCP_KEEPINTVL, (void *)&optval,
+ sizeof(optval)) < 0) {
+ _alpm_log(handle, ALPM_LOG_DEBUG,
+ "Failed to set TCP_KEEPINTVL on fd %d\n", curlfd);
+ }
+#endif
+ }
+
+ return 0;
+}
+
static void curl_set_handle_opts(struct dload_payload *payload,
CURL *curl, char *error_buffer)
{
@@ -241,6 +290,8 @@ static void curl_set_handle_opts(struct dload_payload *payload,
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, parse_headers);
curl_easy_setopt(curl, CURLOPT_WRITEHEADER, (void *)payload);
curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
+ curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, dload_sockopt_cb);
+ curl_easy_setopt(curl, CURLOPT_SOCKOPTDATA, (void *)handle);
_alpm_log(handle, ALPM_LOG_DEBUG, "url: %s\n", payload->fileurl);
@@ -392,6 +443,8 @@ static int curl_download_internal(struct dload_payload *payload,
/* perform transfer */
payload->curlerr = curl_easy_perform(curl);
+ _alpm_log(handle, ALPM_LOG_DEBUG, "curl returned error %d from transfer\n",
+ payload->curlerr);
/* disconnect relationships from the curl handle for things that might go out
* of scope, but could still be touched on connection teardown. This really