From 2a06309eddfc6b16a66b4c4d0a1850be197c825d Mon Sep 17 00:00:00 2001
From: Greg V <greg@unrelenting.technology>
Date: Fri, 3 Apr 2020 19:52:04 +0300
Subject: [PATCH] iochannel: support credentials passing on FreeBSD

Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/277>
---
 src/pulsecore/creds.h     |  2 +-
 src/pulsecore/iochannel.c | 37 ++++++++++++++++++++++++++++---------
 2 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/src/pulsecore/creds.h b/src/pulsecore/creds.h
index 9fdbb4f7e..b599b569c 100644
--- a/src/pulsecore/creds.h
+++ b/src/pulsecore/creds.h
@@ -34,7 +34,7 @@
 typedef struct pa_creds pa_creds;
 typedef struct pa_cmsg_ancil_data pa_cmsg_ancil_data;
 
-#if defined(SCM_CREDENTIALS)
+#if defined(SCM_CREDENTIALS) || defined(SCM_CREDS)
 
 #define HAVE_CREDS 1
 
diff --git a/src/pulsecore/iochannel.c b/src/pulsecore/iochannel.c
index eb93176ec..38b79d173 100644
--- a/src/pulsecore/iochannel.c
+++ b/src/pulsecore/iochannel.c
@@ -261,6 +261,13 @@ ssize_t pa_iochannel_read(pa_iochannel*io, void*data, size_t l) {
 
 #ifdef HAVE_CREDS
 
+#ifdef __FreeBSD__
+typedef struct cmsgcred pa_ucred_t;
+#define SCM_CREDENTIALS SCM_CREDS
+#else
+typedef struct ucred pa_ucred_t;
+#endif
+
 bool pa_iochannel_creds_supported(pa_iochannel *io) {
     struct {
         struct sockaddr sa;
@@ -284,15 +291,19 @@ bool pa_iochannel_creds_supported(pa_iochannel *io) {
 }
 
 int pa_iochannel_creds_enable(pa_iochannel *io) {
+#ifndef __FreeBSD__
     int t = 1;
+#endif
 
     pa_assert(io);
     pa_assert(io->ifd >= 0);
 
+#ifndef __FreeBSD__
     if (setsockopt(io->ifd, SOL_SOCKET, SO_PASSCRED, &t, sizeof(t)) < 0) {
         pa_log_error("setsockopt(SOL_SOCKET, SO_PASSCRED): %s", pa_cstrerror(errno));
         return -1;
     }
+#endif
 
     return 0;
 }
@@ -303,9 +314,9 @@ ssize_t pa_iochannel_write_with_creds(pa_iochannel*io, const void*data, size_t l
     struct iovec iov;
     union {
         struct cmsghdr hdr;
-        uint8_t data[CMSG_SPACE(sizeof(struct ucred))];
+        uint8_t data[CMSG_SPACE(sizeof(pa_ucred_t))];
     } cmsg;
-    struct ucred *u;
+    pa_ucred_t *u;
 
     pa_assert(io);
     pa_assert(data);
@@ -317,12 +328,15 @@ ssize_t pa_iochannel_write_with_creds(pa_iochannel*io, const void*data, size_t l
     iov.iov_len = l;
 
     pa_zero(cmsg);
-    cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(struct ucred));
+    cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(pa_ucred_t));
     cmsg.hdr.cmsg_level = SOL_SOCKET;
     cmsg.hdr.cmsg_type = SCM_CREDENTIALS;
 
-    u = (struct ucred*) CMSG_DATA(&cmsg.hdr);
+    u = (pa_ucred_t*) CMSG_DATA(&cmsg.hdr);
 
+#ifdef __FreeBSD__
+    // the kernel fills everything
+#else
     u->pid = getpid();
     if (ucred) {
         u->uid = ucred->uid;
@@ -331,6 +345,7 @@ ssize_t pa_iochannel_write_with_creds(pa_iochannel*io, const void*data, size_t l
         u->uid = getuid();
         u->gid = getgid();
     }
+#endif
 
     pa_zero(mh);
     mh.msg_iov = &iov;
@@ -403,7 +418,7 @@ ssize_t pa_iochannel_read_with_ancil_data(pa_iochannel*io, void*data, size_t l,
     struct iovec iov;
     union {
         struct cmsghdr hdr;
-        uint8_t data[CMSG_SPACE(sizeof(struct ucred)) + CMSG_SPACE(sizeof(int) * MAX_ANCIL_DATA_FDS)];
+        uint8_t data[CMSG_SPACE(sizeof(pa_ucred_t)) + CMSG_SPACE(sizeof(int) * MAX_ANCIL_DATA_FDS)];
     } cmsg;
 
     pa_assert(io);
@@ -439,12 +454,16 @@ ssize_t pa_iochannel_read_with_ancil_data(pa_iochannel*io, void*data, size_t l,
                 continue;
 
             if (cmh->cmsg_type == SCM_CREDENTIALS) {
-                struct ucred u;
-                pa_assert(cmh->cmsg_len == CMSG_LEN(sizeof(struct ucred)));
-                memcpy(&u, CMSG_DATA(cmh), sizeof(struct ucred));
-
+                pa_ucred_t u;
+                pa_assert(cmh->cmsg_len == CMSG_LEN(sizeof(pa_ucred_t)));
+                memcpy(&u, CMSG_DATA(cmh), sizeof(pa_ucred_t));
+#ifdef __FreeBSD__
+                ancil_data->creds.gid = u.cmcred_gid;
+                ancil_data->creds.uid = u.cmcred_uid;
+#else
                 ancil_data->creds.gid = u.gid;
                 ancil_data->creds.uid = u.uid;
+#endif
                 ancil_data->creds_valid = true;
             }
             else if (cmh->cmsg_type == SCM_RIGHTS) {