[Xcb-commit] src
Arnaud Fontaine
arnau at kemper.freedesktop.org
Fri Apr 30 05:49:16 PDT 2010
src/xcb_auth.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++--------
src/xcb_util.c | 29 +++++++++++++++++------
2 files changed, 83 insertions(+), 16 deletions(-)
New commits:
commit a546d00091de0ab16374dec55e8e2fa87d6bbebf
Author: Arnaud Fontaine <arnau at debian.org>
Date: Fri Apr 30 14:47:16 2010 +0200
Get rid of PATH_MAX and MAXPATHLEN
There could be no upper limit on the length of a path according
to POSIX, therefore these macros may not be defined at all on
some systems (such as GNU Hurd).
Signed-off-by: Arnaud Fontaine <arnau at debian.org>
Reviewed-by: Peter Harris <pharris at opentext.com>
diff --git a/src/xcb_auth.c b/src/xcb_auth.c
index 00aad23..d774d10 100644
--- a/src/xcb_auth.c
+++ b/src/xcb_auth.c
@@ -89,8 +89,7 @@ static int authname_match(enum auth_protos kind, char *name, size_t namelen)
#define SIN6_ADDR(s) (&((struct sockaddr_in6 *)s)->sin6_addr)
-static Xauth *get_authptr(struct sockaddr *sockname, unsigned int socknamelen,
- int display)
+static Xauth *get_authptr(struct sockaddr *sockname, int display)
{
char *addr = 0;
int addrlen = 0;
@@ -243,13 +242,55 @@ static int compute_auth(xcb_auth_info_t *info, Xauth *authptr, struct sockaddr *
return 0; /* Unknown authorization type */
}
+/* `sockaddr_un.sun_path' typical size usually ranges between 92 and 108 */
+#define INITIAL_SOCKNAME_SLACK 108
+
+/* Return a dynamically allocated socket address structure according
+ to the value returned by either getpeername() or getsockname()
+ (according to POSIX, applications should not assume a particular
+ length for `sockaddr_un.sun_path') */
+static struct sockaddr *get_peer_sock_name(int (*socket_func)(int,
+ struct sockaddr *,
+ socklen_t *),
+ int fd)
+{
+ socklen_t socknamelen = sizeof(struct sockaddr) + INITIAL_SOCKNAME_SLACK;
+ socklen_t actual_socknamelen = socknamelen;
+ struct sockaddr *sockname = malloc(socknamelen), *new_sockname = NULL;
+
+ if (sockname == NULL)
+ return NULL;
+
+ /* Both getpeername() and getsockname() truncates sockname if
+ there is not enough space and set the required length in
+ actual_socknamelen */
+ if (socket_func(fd, sockname, &actual_socknamelen) == -1)
+ goto sock_or_realloc_error;
+
+ if (actual_socknamelen > socknamelen)
+ {
+ socknamelen = actual_socknamelen;
+
+ if ((new_sockname = realloc(sockname, actual_socknamelen)) == NULL ||
+ socket_func(fd, new_sockname, &actual_socknamelen) == -1 ||
+ actual_socknamelen > socknamelen)
+ goto sock_or_realloc_error;
+
+ sockname = new_sockname;
+ }
+
+ return sockname;
+
+ sock_or_realloc_error:
+ free(sockname);
+ return NULL;
+}
+
int _xcb_get_auth_info(int fd, xcb_auth_info_t *info, int display)
{
/* code adapted from Xlib/ConnDis.c, xtrans/Xtranssocket.c,
xtrans/Xtransutils.c */
- char sockbuf[sizeof(struct sockaddr) + MAXPATHLEN];
- unsigned int socknamelen = sizeof(sockbuf); /* need extra space */
- struct sockaddr *sockname = (struct sockaddr *) &sockbuf;
+ struct sockaddr *sockname = NULL;
int gotsockname = 0;
Xauth *authptr = 0;
int ret = 1;
@@ -258,24 +299,30 @@ int _xcb_get_auth_info(int fd, xcb_auth_info_t *info, int display)
* for UNIX Domain Sockets, but this is irrelevant,
* since compute_auth() ignores the peer name in this
* case anyway.*/
- if (getpeername(fd, sockname, &socknamelen) == -1)
+ if ((sockname = get_peer_sock_name(getpeername, fd)) == NULL)
{
- if (getsockname(fd, sockname, &socknamelen) == -1)
+ if ((sockname = get_peer_sock_name(getsockname, fd)) == NULL)
return 0; /* can only authenticate sockets */
if (sockname->sa_family != AF_UNIX)
+ {
+ free(sockname);
return 0; /* except for AF_UNIX, sockets should have peernames */
+ }
gotsockname = 1;
}
- authptr = get_authptr(sockname, socknamelen, display);
+ authptr = get_authptr(sockname, display);
if (authptr == 0)
+ {
+ free(sockname);
return 0; /* cannot find good auth data */
+ }
info->namelen = memdup(&info->name, authptr->name, authptr->name_length);
if (!info->namelen)
goto no_auth; /* out of memory */
- if (!gotsockname && getsockname(fd, sockname, &socknamelen) == -1)
+ if (!gotsockname && (sockname = get_peer_sock_name(getsockname, fd)) == NULL)
{
free(info->name);
goto no_auth; /* can only authenticate sockets */
@@ -288,10 +335,15 @@ int _xcb_get_auth_info(int fd, xcb_auth_info_t *info, int display)
goto no_auth; /* cannot build auth record */
}
+ free(sockname);
+ sockname = NULL;
+
XauDisposeAuth(authptr);
return ret;
no_auth:
+ free(sockname);
+
info->name = 0;
info->namelen = 0;
XauDisposeAuth(authptr);
diff --git a/src/xcb_util.c b/src/xcb_util.c
index 287f12f..cc4e24a 100644
--- a/src/xcb_util.c
+++ b/src/xcb_util.c
@@ -145,8 +145,9 @@ static int _xcb_open(char *host, char *protocol, const int display)
#endif
static const char unix_base[] = "/tmp/.X11-unix/X";
const char *base = unix_base;
- char file[PATH_MAX + 1];
- int filelen;
+ size_t filelen;
+ char *file = NULL;
+ int actual_filelen;
if(*host)
{
@@ -181,24 +182,38 @@ static int _xcb_open(char *host, char *protocol, const int display)
#endif
}
+ filelen = strlen(base) + 1 + sizeof(display) * 3 + 1;
+ file = malloc(filelen);
+ if(file == NULL)
+ return -1;
+
/* display specifies Unix socket */
#ifdef HAVE_LAUNCHD
if(base == host)
- filelen = snprintf(file, sizeof(file), "%s:%d", base, display);
+ actual_filelen = snprintf(file, filelen, "%s:%d", base, display);
else
#endif
- filelen = snprintf(file, sizeof(file), "%s%d", base, display);
- if(filelen < 0)
+ actual_filelen = snprintf(file, filelen, "%s%d", base, display);
+ if(actual_filelen < 0)
+ {
+ free(file);
return -1;
+ }
/* snprintf may truncate the file */
- filelen = MIN(filelen, sizeof(file) - 1);
+ filelen = MIN(actual_filelen, filelen - 1);
#ifdef HAVE_ABSTRACT_SOCKETS
fd = _xcb_open_abstract(protocol, file, filelen);
if (fd >= 0 || (errno != ENOENT && errno != ECONNREFUSED))
+ {
+ free(file);
return fd;
+ }
#endif
- return _xcb_open_unix(protocol, file);
+ fd = _xcb_open_unix(protocol, file);
+ free(file);
+
+ return fd;
}
static int _xcb_socket(int family, int type, int proto)
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