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authorDavid Turner <dturner@twosigma.com>2017-04-18 21:57:43 (GMT)
committerJunio C Hamano <gitster@pobox.com>2017-04-19 02:58:04 (GMT)
commit5781a9a2703e96b01587bb95ceebcc53f2cee91c (patch)
treea0c233542e0d0e694a699f191a16c358d7415122
parentda25bdb7766c01665500cf7c7b75e76ea1f28b49 (diff)
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xgethostname: handle long hostnames
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> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--builtin/gc.c2
-rw-r--r--builtin/receive-pack.c2
-rw-r--r--fetch-pack.c2
-rw-r--r--git-compat-util.h2
-rw-r--r--ident.c2
-rw-r--r--wrapper.c13
6 files changed, 19 insertions, 4 deletions
diff --git a/builtin/gc.c b/builtin/gc.c
index 5befd51..4f85610 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -232,7 +232,7 @@ 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 3ca8ebe..eee5faa 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -1660,7 +1660,7 @@ 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 a75ed6c..f43adfe 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -746,7 +746,7 @@ 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 1f1e824..b8c4c8d 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -882,6 +882,8 @@ 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 8ec0f25..7e386a4 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 e7f1979..64ebd6c 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -679,3 +679,16 @@ 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;
+}