From: David Turner <dturner@twosigma.com>
To: git@vger.kernel.org
Cc: l.s.r@web.de, David Turner <dturner@twosigma.com>
Subject: [PATCH v3 2/2] xgethostname: handle long hostnames
Date: Tue, 18 Apr 2017 17:57:43 -0400 [thread overview]
Message-ID: <20170418215743.18406-3-dturner@twosigma.com> (raw)
In-Reply-To: <20170418215743.18406-1-dturner@twosigma.com>
If the full hostname doesn't fit in the buffer supplied to
gethostname, POSIX does not specify whether the buffer will be
null-terminated, so to be safe, we should do it ourselves. Introduce
new function, xgethostname, which ensures that there is always a \0
at the end of the buffer.
Signed-off-by: David Turner <dturner@twosigma.com>
---
builtin/gc.c | 2 +-
builtin/receive-pack.c | 2 +-
fetch-pack.c | 2 +-
git-compat-util.h | 2 ++
ident.c | 2 +-
wrapper.c | 13 +++++++++++++
6 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/builtin/gc.c b/builtin/gc.c
index 4c4a36e2b5..33a1edabbc 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -250,7 +250,7 @@ static const char *lock_repo_for_gc(int force, pid_t* ret_pid)
/* already locked */
return NULL;
- if (gethostname(my_host, sizeof(my_host)))
+ if (xgethostname(my_host, sizeof(my_host)))
xsnprintf(my_host, sizeof(my_host), "unknown");
pidfile_path = git_pathdup("gc.pid");
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 2612efad3d..0ca423a711 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -1700,7 +1700,7 @@ static const char *unpack(int err_fd, struct shallow_info *si)
argv_array_pushl(&child.args, "index-pack",
"--stdin", hdr_arg, NULL);
- if (gethostname(hostname, sizeof(hostname)))
+ if (xgethostname(hostname, sizeof(hostname)))
xsnprintf(hostname, sizeof(hostname), "localhost");
argv_array_pushf(&child.args,
"--keep=receive-pack %"PRIuMAX" on %s",
diff --git a/fetch-pack.c b/fetch-pack.c
index 055f568775..15d59a0440 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -803,7 +803,7 @@ static int get_pack(struct fetch_pack_args *args,
argv_array_push(&cmd.args, "--fix-thin");
if (args->lock_pack || unpack_limit) {
char hostname[HOST_NAME_MAX + 1];
- if (gethostname(hostname, sizeof(hostname)))
+ if (xgethostname(hostname, sizeof(hostname)))
xsnprintf(hostname, sizeof(hostname), "localhost");
argv_array_pushf(&cmd.args,
"--keep=fetch-pack %"PRIuMAX " on %s",
diff --git a/git-compat-util.h b/git-compat-util.h
index 46f3abe401..bd04564a69 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -888,6 +888,8 @@ extern int xsnprintf(char *dst, size_t max, const char *fmt, ...);
#define HOST_NAME_MAX 256
#endif
+extern int xgethostname(char *buf, size_t len);
+
/* in ctype.c, for kwset users */
extern const unsigned char tolower_trans_tbl[256];
diff --git a/ident.c b/ident.c
index 556851cf94..bea871c8e0 100644
--- a/ident.c
+++ b/ident.c
@@ -122,7 +122,7 @@ static void add_domainname(struct strbuf *out, int *is_bogus)
{
char buf[HOST_NAME_MAX + 1];
- if (gethostname(buf, sizeof(buf))) {
+ if (xgethostname(buf, sizeof(buf))) {
warning_errno("cannot get host name");
strbuf_addstr(out, "(none)");
*is_bogus = 1;
diff --git a/wrapper.c b/wrapper.c
index 0542fc7582..d837417709 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -655,3 +655,16 @@ void sleep_millisec(int millisec)
{
poll(NULL, 0, millisec);
}
+
+int xgethostname(char *buf, size_t len)
+{
+ /*
+ * If the full hostname doesn't fit in buf, POSIX does not
+ * specify whether the buffer will be null-terminated, so to
+ * be safe, do it ourselves.
+ */
+ int ret = gethostname(buf, len);
+ if (!ret)
+ buf[len - 1] = 0;
+ return ret;
+}
--
2.11.GIT
next prev parent reply other threads:[~2017-04-18 21:58 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-18 21:57 [PATCH v3 0/2] gethostbyname fixes David Turner
2017-04-18 21:57 ` [PATCH v3 1/2] use HOST_NAME_MAX to size buffers for gethostname(2) David Turner
2017-04-19 1:28 ` Jonathan Nieder
2017-04-19 2:57 ` Junio C Hamano
2017-04-19 14:03 ` René Scharfe
2017-04-19 17:28 ` René Scharfe
2017-04-19 19:08 ` David Turner
2017-04-19 19:09 ` Torsten Bögershausen
2017-04-19 20:02 ` René Scharfe
2017-04-20 18:37 ` Torsten Bögershausen
2017-04-20 19:28 ` René Scharfe
2017-04-21 4:18 ` Torsten Bögershausen
2017-04-18 21:57 ` David Turner [this message]
2017-04-19 1:35 ` [PATCH v3 2/2] xgethostname: handle long hostnames Jonathan Nieder
2017-04-19 2:51 ` Junio C Hamano
2017-04-19 15:50 ` David Turner
2017-04-19 16:43 ` René Scharfe
2017-04-19 2:48 ` Junio C Hamano
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170418215743.18406-3-dturner@twosigma.com \
--to=dturner@twosigma.com \
--cc=git@vger.kernel.org \
--cc=l.s.r@web.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).