Add textclient, fix some textmessage issues

1 files changed, 86 insertions, 0 deletions

diff --git a/src/libunixonacid/textclient_server_init_fromsocket.c b/src/libunixonacid/textclient_server_init_fromsocket.c
new file mode 100644
index 0000000..5b71463
--- /dev/null
+++ b/src/libunixonacid/textclient_server_init_fromsocket.c
@@ -0,0 +1,86 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+#include <skalibs/nonposix.h>
+#include <sys/uio.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <skalibs/types.h>
+#include <skalibs/error.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/unix-timed.h>
+#include <skalibs/textmessage.h>
+#include <skalibs/textclient.h>
+
+#ifndef MSG_NOSIGNAL
+#define MSG_NOSIGNAL 0
+#endif
+
+union aligner_u
+{
+  struct cmsghdr cmsghdr ;
+  int i ;
+} ;
+
+static int getfd (void *p)
+{
+  return ((int *)p)[0] ;
+}
+
+static int one (void *p)
+{
+  (void)p ;
+  return 1 ;
+}
+
+static int sendit (void *p)
+{
+  int *fd = p ;
+  union aligner_u ancilbuf[1 + (CMSG_SPACE(sizeof(int)) - 1) / sizeof(union aligner_u)] ;
+  ssize_t r ;
+  char ch = '|' ;
+  struct iovec v = { .iov_base = &ch, .iov_len = 1 } ;
+  struct msghdr hdr =
+  {
+    .msg_name = 0,
+    .msg_namelen = 0,
+    .msg_iov = &v,
+    .msg_iovlen = 1,
+    .msg_control = ancilbuf,
+    .msg_controllen = CMSG_SPACE(sizeof(int))
+  } ;
+  struct cmsghdr *c = CMSG_FIRSTHDR(&hdr) ;
+  memset(hdr.msg_control, 0, hdr.msg_controllen) ;
+  c->cmsg_level = SOL_SOCKET ;
+  c->cmsg_type = SCM_RIGHTS ;
+  c->cmsg_len = CMSG_LEN(sizeof(int)) ;
+  *(int *)CMSG_DATA(c) = fd[1] ;
+  do r = sendmsg(fd[0], &hdr, MSG_NOSIGNAL) ;
+  while (r < 0 && errno == EINTR) ;
+  if (r <= 0) return 0 ;
+#ifndef SKALIBS_HASANCILAUTOCLOSE
+  fd_close(fd[1]) ;
+#endif
+  return 1 ;
+}
+
+int textclient_server_init_fromsocket (textmessage_receiver_t *in, textmessage_sender_t *syncout, textmessage_sender_t *asyncout, char const *before, size_t beforelen, char const *after, size_t afterlen, tain_t const *deadline, tain_t *stamp)
+{
+  int fd[3] = { textmessage_sender_fd(syncout) } ;
+  struct iovec v ;
+  if (sanitize_read(textmessage_timed_receive(in, &v, deadline, stamp)) <= 0) return 0 ;
+  if (v.iov_len != beforelen || memcmp(v.iov_base, before, beforelen)) return (errno = EPROTO, 0) ;
+  if (pipenbcoe(fd+1) < 0) return 0 ;
+  if (!timed_flush(fd, &getfd, &one, &sendit, deadline, stamp)) goto err ;
+  if (!textmessage_timed_send(syncout, after, afterlen, deadline, stamp)) goto err ;
+  textmessage_sender_init(asyncout, fd[2]) ;
+  if (!textmessage_timed_send(asyncout, after, afterlen, deadline, stamp)) goto err ;
+  return 1 ;
+
+ err:
+  fd_close(fd[2]) ;
+  fd_close(fd[1]) ;
+  return 0 ;
+}