Port: move memset of anc_buf inside ifdef

[lttng-tools.git] / src / common / sessiond-comm / unix.c

diff --git a/src/common/sessiond-comm/unix.c b/src/common/sessiond-comm/unix.c
index 9ef04ee0df1943ce41b4ca886ee2913d27d21619..e2d0def8e842f2eb156d82178a71ca3be148f96c 100644 (file)
--- a/src/common/sessiond-comm/unix.c
+++ b/src/common/sessiond-comm/unix.c
@@ -17,6 +17,7 @@
  */
 
 #define _GNU_SOURCE
+#define _LGPL_SOURCE
 #include <assert.h>
 #include <limits.h>
 #include <stdio.h>
@@ -27,15 +28,14 @@
 #include <unistd.h>
 #include <errno.h>
 
-#include <common/defaults.h>
-#include <common/error.h>
+#include <common/common.h>
 
 #include "unix.h"
 
 /*
  * Connect to unix socket using the path name.
  */
-__attribute__((visibility("hidden")))
+LTTNG_HIDDEN
 int lttcomm_connect_unix_sock(const char *pathname)
 {
        struct sockaddr_un sun;
@@ -77,7 +77,7 @@ error:
  * Do an accept(2) on the sock and return the new file descriptor. The socket
  * MUST be bind(2) before.
  */
-__attribute__((visibility("hidden")))
+LTTNG_HIDDEN
 int lttcomm_accept_unix_sock(int sock)
 {
        int new_fd;
@@ -93,11 +93,21 @@ int lttcomm_accept_unix_sock(int sock)
        return new_fd;
 }
 
+LTTNG_HIDDEN
+int lttcomm_create_anon_unix_socketpair(int *fds)
+{
+       if (socketpair(PF_UNIX, SOCK_STREAM, 0, fds) < 0) {
+               PERROR("socketpair");
+               return -1;
+       }
+       return 0;
+}
+
 /*
  * Creates a AF_UNIX local socket using pathname bind the socket upon creation
  * and return the fd.
  */
-__attribute__((visibility("hidden")))
+LTTNG_HIDDEN
 int lttcomm_create_unix_sock(const char *pathname)
 {
        struct sockaddr_un sun;
@@ -126,13 +136,18 @@ int lttcomm_create_unix_sock(const char *pathname)
        return fd;
 
 error:
+       if (fd >= 0) {
+               if (close(fd) < 0) {
+                       PERROR("close create unix sock");
+               }
+       }
        return ret;
 }
 
 /*
  * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN.
  */
-__attribute__((visibility("hidden")))
+LTTNG_HIDDEN
 int lttcomm_listen_unix_sock(int sock)
 {
        int ret;
@@ -151,12 +166,13 @@ int lttcomm_listen_unix_sock(int sock)
  *
  * Return the size of received data.
  */
-__attribute__((visibility("hidden")))
+LTTNG_HIDDEN
 ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
 {
        struct msghdr msg;
        struct iovec iov[1];
        ssize_t ret = -1;
+       size_t len_last;
 
        memset(&msg, 0, sizeof(msg));
 
@@ -166,11 +182,20 @@ ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
        msg.msg_iovlen = 1;
 
        do {
-               ret = recvmsg(sock, &msg, MSG_WAITALL);
-       } while (ret < 0 && errno == EINTR);
+               len_last = iov[0].iov_len;
+               ret = recvmsg(sock, &msg, MSG_NOSIGNAL);
+               if (ret > 0) {
+                       iov[0].iov_base += ret;
+                       iov[0].iov_len -= ret;
+                       assert(ret <= len_last);
+               }
+       } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR));
        if (ret < 0) {
                PERROR("recvmsg");
+       } else if (ret > 0) {
+               ret = len;
        }
+       /* Else ret = 0 meaning an orderly shutdown. */
 
        return ret;
 }
@@ -180,7 +205,7 @@ ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
  *
  * Return the size of sent data.
  */
-__attribute__((visibility("hidden")))
+LTTNG_HIDDEN
 ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
 {
        struct msghdr msg;
@@ -211,7 +236,7 @@ ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
 /*
  * Shutdown cleanly a unix socket.
  */
-__attribute__((visibility("hidden")))
+LTTNG_HIDDEN
 int lttcomm_close_unix_sock(int sock)
 {
        int ret, closeret;
@@ -235,7 +260,7 @@ int lttcomm_close_unix_sock(int sock)
  *
  * Returns the size of data sent, or negative error value.
  */
-__attribute__((visibility("hidden")))
+LTTNG_HIDDEN
 ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd)
 {
        struct msghdr msg;
@@ -247,6 +272,7 @@ ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd)
        char dummy = 0;
 
        memset(&msg, 0, sizeof(msg));
+       memset(tmp, 0, CMSG_SPACE(sizeof_fds) * sizeof(char));
 
        if (nb_fd > LTTCOMM_MAX_SEND_FDS)
                return -EINVAL;
@@ -255,6 +281,9 @@ ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd)
        msg.msg_controllen = CMSG_LEN(sizeof_fds);
 
        cmptr = CMSG_FIRSTHDR(&msg);
+       if (!cmptr) {
+               return -1;
+       }
        cmptr->cmsg_level = SOL_SOCKET;
        cmptr->cmsg_type = SCM_RIGHTS;
        cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
@@ -290,7 +319,7 @@ ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd)
  * Expect at most "nb_fd" file descriptors. Returns the number of fd
  * actually received in nb_fd.
  */
-__attribute__((visibility("hidden")))
+LTTNG_HIDDEN
 ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
 {
        struct iovec iov[1];
@@ -356,7 +385,7 @@ end:
  *
  * Returns the size of data sent, or negative error value.
  */
-__attribute__((visibility("hidden")))
+LTTNG_HIDDEN
 ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len)
 {
        struct msghdr msg;
@@ -367,6 +396,8 @@ ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len)
        size_t sizeof_cred = sizeof(lttng_sock_cred);
        char anc_buf[CMSG_SPACE(sizeof_cred)];
        lttng_sock_cred *creds;
+
+       memset(anc_buf, 0, CMSG_SPACE(sizeof_cred) * sizeof(char));
 #endif /* __linux__ */
 
        memset(&msg, 0, sizeof(msg));
@@ -381,6 +412,9 @@ ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len)
        msg.msg_controllen = CMSG_LEN(sizeof_cred);
 
        cmptr = CMSG_FIRSTHDR(&msg);
+       if (!cmptr) {
+               return -1;
+       }
        cmptr->cmsg_level = SOL_SOCKET;
        cmptr->cmsg_type = LTTNG_SOCK_CREDS;
        cmptr->cmsg_len = CMSG_LEN(sizeof_cred);
@@ -412,13 +446,14 @@ ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len)
  *
  * Returns the size of received data, or negative error value.
  */
-__attribute__((visibility("hidden")))
+LTTNG_HIDDEN
 ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len,
                lttng_sock_cred *creds)
 {
        struct msghdr msg;
        struct iovec iov[1];
        ssize_t ret;
+       size_t len_last;
 #ifdef __linux__
        struct cmsghdr *cmptr;
        size_t sizeof_cred = sizeof(lttng_sock_cred);
@@ -445,12 +480,21 @@ ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len,
 #endif /* __linux__ */
 
        do {
+               len_last = iov[0].iov_len;
                ret = recvmsg(sock, &msg, 0);
-       } while (ret < 0 && errno == EINTR);
+               if (ret > 0) {
+                       iov[0].iov_base += ret;
+                       iov[0].iov_len -= ret;
+                       assert(ret <= len_last);
+               }
+       } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR));
        if (ret < 0) {
                PERROR("recvmsg fds");
                goto end;
+       } else if (ret > 0) {
+               ret = len;
        }
+       /* Else ret = 0 meaning an orderly shutdown. */
 
 #ifdef __linux__
        if (msg.msg_flags & MSG_CTRUNC) {
@@ -502,7 +546,7 @@ end:
  * Set socket option to use credentials passing.
  */
 #ifdef __linux__
-__attribute__((visibility("hidden")))
+LTTNG_HIDDEN
 int lttcomm_setsockopt_creds_unix_sock(int sock)
 {
        int ret, on = 1;
@@ -515,7 +559,7 @@ int lttcomm_setsockopt_creds_unix_sock(int sock)
        return ret;
 }
 #elif (defined(__FreeBSD__) || defined(__CYGWIN__))
-__attribute__((visibility("hidden")))
+LTTNG_HIDDEN
 int lttcomm_setsockopt_creds_unix_sock(int sock)
 {
        return 0;