[pulseaudio-discuss] [PATCH 02/11] iochannel/pstream/pdispatch: Add support for receiving file descriptors
David Henningsson
david.henningsson at canonical.com
Tue Apr 29 06:22:16 PDT 2014
The file descriptors are read from the iochannel just like the creds are.
So instead of passing just creds (and creds_valid), we now pass the
entire pa_ancil struct.
Signed-off-by: David Henningsson <david.henningsson at canonical.com>
---
src/modules/module-tunnel.c | 4 ++--
src/pulse/context.c | 4 ++--
src/pulsecore/iochannel.c | 31 +++++++++++++++++++++----------
src/pulsecore/iochannel.h | 2 +-
src/pulsecore/pdispatch.c | 26 +++++++++++++++++++++-----
src/pulsecore/pdispatch.h | 4 +++-
src/pulsecore/protocol-native.c | 4 ++--
src/pulsecore/pstream.c | 24 +++++++++++++++++-------
src/pulsecore/pstream.h | 2 +-
9 files changed, 70 insertions(+), 31 deletions(-)
diff --git a/src/modules/module-tunnel.c b/src/modules/module-tunnel.c
index 6b3512e..e241033 100644
--- a/src/modules/module-tunnel.c
+++ b/src/modules/module-tunnel.c
@@ -1780,14 +1780,14 @@ static void pstream_die_callback(pa_pstream *p, void *userdata) {
}
/* Called from main context */
-static void pstream_packet_callback(pa_pstream *p, pa_packet *packet, const pa_creds *creds, void *userdata) {
+static void pstream_packet_callback(pa_pstream *p, pa_packet *packet, const pa_ancil *ancil, void *userdata) {
struct userdata *u = userdata;
pa_assert(p);
pa_assert(packet);
pa_assert(u);
- if (pa_pdispatch_run(u->pdispatch, packet, creds, u) < 0) {
+ if (pa_pdispatch_run(u->pdispatch, packet, ancil, u) < 0) {
pa_log("Invalid packet");
pa_module_unload_request(u->module, true);
return;
diff --git a/src/pulse/context.c b/src/pulse/context.c
index ce19d91..f3adf4c 100644
--- a/src/pulse/context.c
+++ b/src/pulse/context.c
@@ -323,7 +323,7 @@ static void pstream_die_callback(pa_pstream *p, void *userdata) {
pa_context_fail(c, PA_ERR_CONNECTIONTERMINATED);
}
-static void pstream_packet_callback(pa_pstream *p, pa_packet *packet, const pa_creds *creds, void *userdata) {
+static void pstream_packet_callback(pa_pstream *p, pa_packet *packet, const pa_ancil *ancil, void *userdata) {
pa_context *c = userdata;
pa_assert(p);
@@ -332,7 +332,7 @@ static void pstream_packet_callback(pa_pstream *p, pa_packet *packet, const pa_c
pa_context_ref(c);
- if (pa_pdispatch_run(c->pdispatch, packet, creds, c) < 0)
+ if (pa_pdispatch_run(c->pdispatch, packet, ancil, c) < 0)
pa_context_fail(c, PA_ERR_PROTOCOL);
pa_context_unref(c);
diff --git a/src/pulsecore/iochannel.c b/src/pulsecore/iochannel.c
index dce6734..a6efdf5 100644
--- a/src/pulsecore/iochannel.c
+++ b/src/pulsecore/iochannel.c
@@ -348,21 +348,20 @@ ssize_t pa_iochannel_write_with_creds(pa_iochannel*io, const void*data, size_t l
return r;
}
-ssize_t pa_iochannel_read_with_creds(pa_iochannel*io, void*data, size_t l, pa_creds *creds, bool *creds_valid) {
+ssize_t pa_iochannel_read_with_ancil(pa_iochannel*io, void*data, size_t l, pa_ancil *ancil) {
ssize_t r;
struct msghdr mh;
struct iovec iov;
union {
struct cmsghdr hdr;
- uint8_t data[CMSG_SPACE(sizeof(struct ucred))];
+ uint8_t data[CMSG_SPACE(sizeof(struct ucred)) + CMSG_SPACE(sizeof(int) * MAX_ANCIL_FDS)];
} cmsg;
pa_assert(io);
pa_assert(data);
pa_assert(l);
pa_assert(io->ifd >= 0);
- pa_assert(creds);
- pa_assert(creds_valid);
+ pa_assert(ancil);
pa_zero(iov);
iov.iov_base = data;
@@ -378,19 +377,31 @@ ssize_t pa_iochannel_read_with_creds(pa_iochannel*io, void*data, size_t l, pa_cr
if ((r = recvmsg(io->ifd, &mh, 0)) >= 0) {
struct cmsghdr *cmh;
- *creds_valid = false;
+ ancil->creds_valid = false;
+ ancil->nfd = 0;
for (cmh = CMSG_FIRSTHDR(&mh); cmh; cmh = CMSG_NXTHDR(&mh, cmh)) {
- if (cmh->cmsg_level == SOL_SOCKET && cmh->cmsg_type == SCM_CREDENTIALS) {
+ if (cmh->cmsg_level != SOL_SOCKET)
+ 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));
- creds->gid = u.gid;
- creds->uid = u.uid;
- *creds_valid = true;
- break;
+ ancil->creds.gid = u.gid;
+ ancil->creds.uid = u.uid;
+ ancil->creds_valid = true;
+ }
+ else if (cmh->cmsg_type == SCM_RIGHTS) {
+ int nfd = (cmh->cmsg_len - CMSG_LEN(0)) / sizeof(int);
+ if (nfd > MAX_ANCIL_FDS) {
+ pa_log("Trying to receive too many file descriptors!");
+ continue;
+ }
+ memcpy(ancil->fds, CMSG_DATA(cmh), nfd * sizeof(int));
+ ancil->nfd = nfd;
}
}
diff --git a/src/pulsecore/iochannel.h b/src/pulsecore/iochannel.h
index e95f46f..4da8902 100644
--- a/src/pulsecore/iochannel.h
+++ b/src/pulsecore/iochannel.h
@@ -58,7 +58,7 @@ bool pa_iochannel_creds_supported(pa_iochannel *io);
int pa_iochannel_creds_enable(pa_iochannel *io);
ssize_t pa_iochannel_write_with_creds(pa_iochannel*io, const void*data, size_t l, const pa_creds *ucred);
-ssize_t pa_iochannel_read_with_creds(pa_iochannel*io, void*data, size_t l, pa_creds *ucred, bool *creds_valid);
+ssize_t pa_iochannel_read_with_ancil(pa_iochannel*io, void*data, size_t l, pa_ancil *ancil);
#endif
bool pa_iochannel_is_readable(pa_iochannel*io);
diff --git a/src/pulsecore/pdispatch.c b/src/pulsecore/pdispatch.c
index 1766d6d..483ce6b 100644
--- a/src/pulsecore/pdispatch.c
+++ b/src/pulsecore/pdispatch.c
@@ -216,7 +216,7 @@ struct pa_pdispatch {
PA_LLIST_HEAD(struct reply_info, replies);
pa_pdispatch_drain_cb_t drain_callback;
void *drain_userdata;
- const pa_creds *creds;
+ const pa_ancil *ancil;
bool use_rtclock;
};
@@ -286,7 +286,7 @@ static void run_action(pa_pdispatch *pd, struct reply_info *r, uint32_t command,
pa_pdispatch_unref(pd);
}
-int pa_pdispatch_run(pa_pdispatch *pd, pa_packet*packet, const pa_creds *creds, void *userdata) {
+int pa_pdispatch_run(pa_pdispatch *pd, pa_packet*packet, const pa_ancil *ancil, void *userdata) {
uint32_t tag, command;
pa_tagstruct *ts = NULL;
int ret = -1;
@@ -320,7 +320,7 @@ int pa_pdispatch_run(pa_pdispatch *pd, pa_packet*packet, const pa_creds *creds,
}
#endif
- pd->creds = creds;
+ pd->ancil = ancil;
if (command == PA_COMMAND_ERROR || command == PA_COMMAND_REPLY) {
struct reply_info *r;
@@ -344,7 +344,7 @@ int pa_pdispatch_run(pa_pdispatch *pd, pa_packet*packet, const pa_creds *creds,
ret = 0;
finish:
- pd->creds = NULL;
+ pd->ancil = NULL;
if (ts)
pa_tagstruct_free(ts);
@@ -437,5 +437,21 @@ const pa_creds * pa_pdispatch_creds(pa_pdispatch *pd) {
pa_assert(pd);
pa_assert(PA_REFCNT_VALUE(pd) >= 1);
- return pd->creds;
+ if (pd->ancil && pd->ancil->creds_valid)
+ return &pd->ancil->creds;
+ return NULL;
+}
+
+const int * pa_pdispatch_fds(pa_pdispatch *pd, int *nfd) {
+ pa_assert(pd);
+ pa_assert(PA_REFCNT_VALUE(pd) >= 1);
+ pa_assert(nfd);
+
+ if (pd->ancil) {
+ *nfd = pd->ancil->nfd;
+ return pd->ancil->fds;
+ }
+
+ *nfd = 0;
+ return NULL;
}
diff --git a/src/pulsecore/pdispatch.h b/src/pulsecore/pdispatch.h
index 797ddca..038f90d 100644
--- a/src/pulsecore/pdispatch.h
+++ b/src/pulsecore/pdispatch.h
@@ -41,7 +41,7 @@ pa_pdispatch* pa_pdispatch_new(pa_mainloop_api *m, bool use_rtclock, const pa_pd
void pa_pdispatch_unref(pa_pdispatch *pd);
pa_pdispatch* pa_pdispatch_ref(pa_pdispatch *pd);
-int pa_pdispatch_run(pa_pdispatch *pd, pa_packet*p, const pa_creds *creds, void *userdata);
+int pa_pdispatch_run(pa_pdispatch *pd, pa_packet*p, const pa_ancil *ancil, void *userdata);
void pa_pdispatch_register_reply(pa_pdispatch *pd, uint32_t tag, int timeout, pa_pdispatch_cb_t callback, void *userdata, pa_free_cb_t free_cb);
@@ -54,4 +54,6 @@ void pa_pdispatch_unregister_reply(pa_pdispatch *pd, void *userdata);
const pa_creds * pa_pdispatch_creds(pa_pdispatch *pd);
+const int * pa_pdispatch_fds(pa_pdispatch *pd, int *nfd);
+
#endif
diff --git a/src/pulsecore/protocol-native.c b/src/pulsecore/protocol-native.c
index 41b4b50..65b2636 100644
--- a/src/pulsecore/protocol-native.c
+++ b/src/pulsecore/protocol-native.c
@@ -4806,14 +4806,14 @@ static void command_set_port_latency_offset(pa_pdispatch *pd, uint32_t command,
/*** pstream callbacks ***/
-static void pstream_packet_callback(pa_pstream *p, pa_packet *packet, const pa_creds *creds, void *userdata) {
+static void pstream_packet_callback(pa_pstream *p, pa_packet *packet, const pa_ancil *ancil, void *userdata) {
pa_native_connection *c = PA_NATIVE_CONNECTION(userdata);
pa_assert(p);
pa_assert(packet);
pa_native_connection_assert_ref(c);
- if (pa_pdispatch_run(c->pdispatch, packet, creds, c) < 0) {
+ if (pa_pdispatch_run(c->pdispatch, packet, ancil, c) < 0) {
pa_log("invalid packet.");
native_connection_unlink(c);
}
diff --git a/src/pulsecore/pstream.c b/src/pulsecore/pstream.c
index 2c1444f..a3afed5 100644
--- a/src/pulsecore/pstream.c
+++ b/src/pulsecore/pstream.c
@@ -165,8 +165,9 @@ struct pa_pstream {
pa_mempool *mempool;
#ifdef HAVE_CREDS
- pa_creds read_creds, write_creds;
- bool read_creds_valid, send_creds_now;
+ pa_ancil read_ancil;
+ pa_creds write_creds;
+ bool send_creds_now;
#endif
};
@@ -646,12 +647,20 @@ static int do_read(pa_pstream *p) {
#ifdef HAVE_CREDS
{
- bool b = 0;
+ pa_ancil b;
- if ((r = pa_iochannel_read_with_creds(p->io, d, l, &p->read_creds, &b)) <= 0)
+ if ((r = pa_iochannel_read_with_ancil(p->io, d, l, &b)) <= 0)
goto fail;
- p->read_creds_valid = p->read_creds_valid || b;
+ if (b.creds_valid) {
+ p->read_ancil.creds_valid = true;
+ p->read_ancil.creds = b.creds;
+ }
+ if (b.nfd > 0) {
+ pa_assert(b.nfd <= MAX_ANCIL_FDS);
+ p->read_ancil.nfd = b.nfd;
+ memcpy(p->read_ancil.fds, b.fds, sizeof(int) * b.nfd);
+ }
}
#else
if ((r = pa_iochannel_read(p->io, d, l)) <= 0)
@@ -799,7 +808,7 @@ static int do_read(pa_pstream *p) {
if (p->receive_packet_callback)
#ifdef HAVE_CREDS
- p->receive_packet_callback(p, p->read.packet, p->read_creds_valid ? &p->read_creds : NULL, p->receive_packet_callback_userdata);
+ p->receive_packet_callback(p, p->read.packet, &p->read_ancil, p->receive_packet_callback_userdata);
#else
p->receive_packet_callback(p, p->read.packet, NULL, p->receive_packet_callback_userdata);
#endif
@@ -860,7 +869,8 @@ frame_done:
p->read.data = NULL;
#ifdef HAVE_CREDS
- p->read_creds_valid = false;
+ p->read_ancil.creds_valid = false;
+ p->read_ancil.nfd = 0;
#endif
return 0;
diff --git a/src/pulsecore/pstream.h b/src/pulsecore/pstream.h
index deb2bc3..9316d92 100644
--- a/src/pulsecore/pstream.h
+++ b/src/pulsecore/pstream.h
@@ -37,7 +37,7 @@
typedef struct pa_pstream pa_pstream;
-typedef void (*pa_pstream_packet_cb_t)(pa_pstream *p, pa_packet *packet, const pa_creds *creds, void *userdata);
+typedef void (*pa_pstream_packet_cb_t)(pa_pstream *p, pa_packet *packet, const pa_ancil *ancil, void *userdata);
typedef void (*pa_pstream_memblock_cb_t)(pa_pstream *p, uint32_t channel, int64_t offset, pa_seek_mode_t seek, const pa_memchunk *chunk, void *userdata);
typedef void (*pa_pstream_notify_cb_t)(pa_pstream *p, void *userdata);
typedef void (*pa_pstream_block_id_cb_t)(pa_pstream *p, uint32_t block_id, void *userdata);
--
1.9.1
More information about the pulseaudio-discuss
mailing list