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busybox: fix wget with brain-damaged http servers

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MilhouseVH 2017-06-22 04:56:54 +01:00
parent 89d69787e9
commit 557686d7b6
1 changed files with 80 additions and 0 deletions
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80
packages/sysutils/busybox/patches/busybox-04_fix_for_brain_damaged_http_servers.patch Normal file
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@ -0,0 +1,80 @@
From a6f8651911716d1d1624712eb19e4f3608767c7e Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Wed, 11 Jan 2017 20:16:45 +0100
Subject: [PATCH] wget: fix for brain-damaged HTTP servers. Closes 9471
write(3, "GET / HTTP/1.1\r\nUser-Agent: Wget\r\nConnection: close\r\n\r\n", 74) = 74
shutdown(3, SHUT_WR) = 0
alarm(900) = 900
read(3, "", 1024) = 0
write(2, "wget: error getting response\n", 29) = 29
exit(1)
The peer simply does not return anything. It closes its connection.
Probably it detects wget closing its writing end: shutdown(3, SHUT_WR).
The point it, closing write side of the socket is _valid_ for HTTP.
wget sent the full request, it won't be sending anything more:
it will only receive the response, and that's it.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
networking/wget.c | 23 +++++++++++++++--------
1 file changed, 15 insertions(+), 8 deletions(-)
diff --git a/networking/wget.c b/networking/wget.c
index c82086878..d5a92a950 100644
--- a/networking/wget.c
+++ b/networking/wget.c
@@ -137,6 +137,8 @@
#endif
+#define SSL_SUPPORTED (ENABLE_FEATURE_WGET_OPENSSL || ENABLE_FEATURE_WGET_SSL_HELPER)
+
struct host_info {
char *allocated;
const char *path;
@@ -147,7 +149,7 @@ struct host_info {
};
static const char P_FTP[] ALIGN1 = "ftp";
static const char P_HTTP[] ALIGN1 = "http";
-#if ENABLE_FEATURE_WGET_OPENSSL || ENABLE_FEATURE_WGET_SSL_HELPER
+#if SSL_SUPPORTED
static const char P_HTTPS[] ALIGN1 = "https";
#endif
@@ -448,7 +450,7 @@ static void parse_url(const char *src_url, struct host_info *h)
if (strcmp(url, P_FTP) == 0) {
h->port = bb_lookup_port(P_FTP, "tcp", 21);
} else
-#if ENABLE_FEATURE_WGET_OPENSSL || ENABLE_FEATURE_WGET_SSL_HELPER
+#if SSL_SUPPORTED
if (strcmp(url, P_HTTPS) == 0) {
h->port = bb_lookup_port(P_HTTPS, "tcp", 443);
h->protocol = P_HTTPS;
@@ -1089,12 +1091,17 @@ static void download_one_url(const char *url)
}
fflush(sfp);
- /* If we use SSL helper, keeping our end of the socket open for writing
- * makes our end (i.e. the same fd!) readable (EAGAIN instead of EOF)
- * even after child closes its copy of the fd.
- * This helps:
- */
- shutdown(fileno(sfp), SHUT_WR);
+
+#if SSL_SUPPORTED
+ if (target.protocol == P_HTTPS) {
+ /* If we use SSL helper, keeping our end of the socket open for writing
+ * makes our end (i.e. the same fd!) readable (EAGAIN instead of EOF)
+ * even after child closes its copy of the fd.
+ * This helps:
+ */
+ shutdown(fileno(sfp), SHUT_WR);
+ }
+#endif
/*
* Retrieve HTTP response line and check for "200" status code.