+ ],
+ [ AC_MSG_WARN([cross compiling: Assuming working snprintf()]) ]
+ )
+fi
+
+# If we don't have a working asprintf, then we strongly depend on vsnprintf
+# returning the right thing on overflow: the number of characters it tried to
+# create (as per SUSv3)
+if test "x$ac_cv_func_asprintf" != "xyes" && \
+ test "x$ac_cv_func_vsnprintf" = "xyes" ; then
+ AC_MSG_CHECKING([whether vsnprintf returns correct values on overflow])
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+int x_snprintf(char *str,size_t count,const char *fmt,...)
+{
+ size_t ret; va_list ap;
+ va_start(ap, fmt); ret = vsnprintf(str, count, fmt, ap); va_end(ap);
+ return ret;
+}
+int main(void)
+{
+ char x[1];
+ exit(x_snprintf(x, 1, "%s %d", "hello", 12345) == 11 ? 0 : 1);
+} ]])],
+ [AC_MSG_RESULT(yes)],
+ [
+ AC_MSG_RESULT(no)
+ AC_DEFINE(BROKEN_SNPRINTF, 1,
+ [Define if your snprintf is busted])
+ AC_MSG_WARN([****** Your vsnprintf() function is broken, complain to your vendor])
+ ],
+ [ AC_MSG_WARN([cross compiling: Assuming working vsnprintf()]) ]
+ )
+fi
+
+# On systems where [v]snprintf is broken, but is declared in stdio,
+# check that the fmt argument is const char * or just char *.
+# This is only useful for when BROKEN_SNPRINTF
+AC_MSG_CHECKING([whether snprintf can declare const char *fmt])
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
+ int snprintf(char *a, size_t b, const char *c, ...) { return 0; }
+ int main(void) { snprintf(0, 0, 0); }
+ ]])],
+ [AC_MSG_RESULT(yes)
+ AC_DEFINE(SNPRINTF_CONST, [const],
+ [Define as const if snprintf() can declare const char *fmt])],
+ [AC_MSG_RESULT(no)
+ AC_DEFINE(SNPRINTF_CONST, [/* not const */])])
+
+# Check for missing getpeereid (or equiv) support
+NO_PEERCHECK=""
+if test "x$ac_cv_func_getpeereid" != "xyes" -a "x$ac_cv_func_getpeerucred" != "xyes"; then
+ AC_MSG_CHECKING([whether system supports SO_PEERCRED getsockopt])
+ AC_TRY_COMPILE(
+ [#include <sys/types.h>
+ #include <sys/socket.h>],
+ [int i = SO_PEERCRED;],
+ [ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_SO_PEERCRED, 1, [Have PEERCRED socket option])
+ ],
+ [AC_MSG_RESULT(no)
+ NO_PEERCHECK=1]
+ )
+fi
+
+dnl see whether mkstemp() requires XXXXXX
+if test "x$ac_cv_func_mkdtemp" = "xyes" ; then
+AC_MSG_CHECKING([for (overly) strict mkstemp])
+AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <stdlib.h>
+main() { char template[]="conftest.mkstemp-test";
+if (mkstemp(template) == -1)
+ exit(1);
+unlink(template); exit(0);
+}
+ ]])],
+ [
+ AC_MSG_RESULT(no)
+ ],
+ [
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_STRICT_MKSTEMP, 1, [Silly mkstemp()])
+ ],
+ [
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_STRICT_MKSTEMP)
+ ]
+)
+fi
+
+dnl make sure that openpty does not reacquire controlling terminal
+if test ! -z "$check_for_openpty_ctty_bug"; then
+ AC_MSG_CHECKING(if openpty correctly handles controlling tty)
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <stdio.h>
+#include <sys/fcntl.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+int
+main()
+{
+ pid_t pid;
+ int fd, ptyfd, ttyfd, status;
+
+ pid = fork();
+ if (pid < 0) { /* failed */
+ exit(1);
+ } else if (pid > 0) { /* parent */
+ waitpid(pid, &status, 0);
+ if (WIFEXITED(status))
+ exit(WEXITSTATUS(status));
+ else
+ exit(2);
+ } else { /* child */
+ close(0); close(1); close(2);
+ setsid();
+ openpty(&ptyfd, &ttyfd, NULL, NULL, NULL);
+ fd = open("/dev/tty", O_RDWR | O_NOCTTY);
+ if (fd >= 0)
+ exit(3); /* Acquired ctty: broken */
+ else
+ exit(0); /* Did not acquire ctty: OK */
+ }
+}
+ ]])],
+ [
+ AC_MSG_RESULT(yes)
+ ],
+ [
+ AC_MSG_RESULT(no)
+ AC_DEFINE(SSHD_ACQUIRES_CTTY)
+ ],
+ [
+ AC_MSG_RESULT(cross-compiling, assuming yes)
+ ]
+ )
+fi
+
+if test "x$ac_cv_func_getaddrinfo" = "xyes" && \
+ test "x$check_for_hpux_broken_getaddrinfo" = "x1"; then
+ AC_MSG_CHECKING(if getaddrinfo seems to work)
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <stdio.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <errno.h>
+#include <netinet/in.h>
+
+#define TEST_PORT "2222"
+
+int
+main(void)
+{
+ int err, sock;
+ struct addrinfo *gai_ai, *ai, hints;
+ char ntop[NI_MAXHOST], strport[NI_MAXSERV], *name = NULL;
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = PF_UNSPEC;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_PASSIVE;
+
+ err = getaddrinfo(name, TEST_PORT, &hints, &gai_ai);
+ if (err != 0) {
+ fprintf(stderr, "getaddrinfo failed (%s)", gai_strerror(err));
+ exit(1);
+ }
+
+ for (ai = gai_ai; ai != NULL; ai = ai->ai_next) {
+ if (ai->ai_family != AF_INET6)
+ continue;
+
+ err = getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop,
+ sizeof(ntop), strport, sizeof(strport),
+ NI_NUMERICHOST|NI_NUMERICSERV);
+
+ if (err != 0) {
+ if (err == EAI_SYSTEM)
+ perror("getnameinfo EAI_SYSTEM");
+ else
+ fprintf(stderr, "getnameinfo failed: %s\n",
+ gai_strerror(err));
+ exit(2);
+ }
+
+ sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+ if (sock < 0)
+ perror("socket");
+ if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
+ if (errno == EBADF)
+ exit(3);
+ }
+ }
+ exit(0);
+}
+ ]])],
+ [
+ AC_MSG_RESULT(yes)
+ ],
+ [
+ AC_MSG_RESULT(no)
+ AC_DEFINE(BROKEN_GETADDRINFO)
+ ],
+ [
+ AC_MSG_RESULT(cross-compiling, assuming yes)