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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
commitb5896ba9f6047e7031e2bdee0622d543e11a6734 (patch)
treefd7b460593a2fee1be579bec5697e6d887ea3421 /src/util/stream_recv_fd.c
parentInitial commit. (diff)
downloadpostfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz
postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/util/stream_recv_fd.c')
-rw-r--r--src/util/stream_recv_fd.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/src/util/stream_recv_fd.c b/src/util/stream_recv_fd.c
new file mode 100644
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+++ b/src/util/stream_recv_fd.c
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+/*++
+/* NAME
+/* stream_recv_fd 3
+/* SUMMARY
+/* receive file descriptor
+/* SYNOPSIS
+/* #include <iostuff.h>
+/*
+/* int stream_recv_fd(fd)
+/* int fd;
+/* DESCRIPTION
+/* stream_recv_fd() receives a file descriptor via the specified
+/* stream. The result value is the received descriptor.
+/*
+/* Arguments:
+/* .IP fd
+/* File descriptor that connects the sending and receiving processes.
+/* DIAGNOSTICS
+/* stream_recv_fd() returns -1 upon failure.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h> /* includes <sys/types.h> */
+
+#ifdef STREAM_CONNECTIONS
+
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stropts.h>
+#include <fcntl.h>
+
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <iostuff.h>
+
+/* stream_recv_fd - receive file descriptor */
+
+int stream_recv_fd(int fd)
+{
+#ifdef STREAM_CONNECTIONS
+ struct strrecvfd fdinfo;
+
+ /*
+ * This will return EAGAIN on a non-blocking stream when someone else
+ * snatched the connection from us.
+ */
+ if (ioctl(fd, I_RECVFD, &fdinfo) < 0)
+ return (-1);
+ return (fdinfo.fd);
+#else
+ msg_fatal("stream connections are not implemented");
+#endif
+}
+
+#ifdef TEST
+
+ /*
+ * Proof-of-concept program. Receive a descriptor (presumably from the
+ * stream_send_fd test program) and copy its content until EOF.
+ */
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <split_at.h>
+#include <listen.h>
+
+int main(int argc, char **argv)
+{
+ char *transport;
+ char *endpoint;
+ int listen_sock;
+ int client_sock;
+ int client_fd;
+ ssize_t read_count;
+ char buf[1024];
+
+ if (argc != 2
+ || (endpoint = split_at(transport = argv[1], ':')) == 0
+ || *endpoint == 0 || *transport == 0)
+ msg_fatal("usage: %s transport:endpoint", argv[0]);
+
+ if (strcmp(transport, "stream") == 0) {
+ listen_sock = stream_listen(endpoint, BLOCKING, 0);
+ } else {
+ msg_fatal("invalid transport name: %s", transport);
+ }
+ if (listen_sock < 0)
+ msg_fatal("listen %s:%s: %m", transport, endpoint);
+
+ client_sock = stream_accept(listen_sock);
+ if (client_sock < 0)
+ msg_fatal("stream_accept: %m");
+
+ while ((client_fd = stream_recv_fd(client_sock)) >= 0) {
+ msg_info("client_fd = %d", client_fd);
+ while ((read_count = read(client_fd, buf, sizeof(buf))) > 0)
+ write(1, buf, read_count);
+ if (read_count < 0)
+ msg_fatal("read: %m");
+ if (close(client_fd) != 0)
+ msg_fatal("close(%d): %m", client_fd);
+ }
+ exit(0);
+}
+
+#endif