Fix: Connect timeout arithmetic in inet/inet6 (v4)

[lttng-tools.git] / src / common / sessiond-comm / inet6.c

diff --git a/src/common/sessiond-comm/inet6.c b/src/common/sessiond-comm/inet6.c
index 1413c35172a32bfda2293bbe8aae6fd8acba6c1a..03b6627d1dce45188d28d81d234cb2c208c062eb 100644 (file)
--- a/src/common/sessiond-comm/inet6.c
+++ b/src/common/sessiond-comm/inet6.c
@@ -30,11 +30,10 @@
 #include <poll.h>
 
 #include <common/common.h>
+#include <common/time.h>
 
 #include "inet6.h"
 
-#define MSEC_PER_SEC   1000
-#define NSEC_PER_MSEC  1000000
 #define RECONNECT_DELAY        200     /* ms */
 
 /*
@@ -99,15 +98,9 @@ error:
 LTTNG_HIDDEN
 int lttcomm_bind_inet6_sock(struct lttcomm_sock *sock)
 {
-       int ret;
-
-       ret = bind(sock->fd, (const struct sockaddr *) &sock->sockaddr.addr.sin6,
+       return bind(sock->fd,
+                       (const struct sockaddr *) &sock->sockaddr.addr.sin6,
                        sizeof(sock->sockaddr.addr.sin6));
-       if (ret < 0) {
-               PERROR("bind inet6");
-       }
-
-       return ret;
 }
 
 static
@@ -117,31 +110,13 @@ int connect_no_timeout(struct lttcomm_sock *sock)
                        sizeof(sock->sockaddr.addr.sin6));
 }
 
-/*
- * Return time_a - time_b  in milliseconds.
- */
-static
-unsigned long time_diff_ms(struct timespec *time_a,
-               struct timespec *time_b)
-{
-       time_t sec_diff;
-       long nsec_diff;
-       unsigned long result_ms;
-
-       sec_diff = time_a->tv_sec - time_b->tv_sec;
-       nsec_diff = time_a->tv_nsec - time_b->tv_nsec;
-
-       result_ms = sec_diff * MSEC_PER_SEC;
-       result_ms += nsec_diff / NSEC_PER_MSEC;
-       return result_ms;
-}
-
 static
 int connect_with_timeout(struct lttcomm_sock *sock)
 {
        unsigned long timeout = lttcomm_get_network_timeout();
        int ret, flags, connect_ret;
        struct timespec orig_time, cur_time;
+       unsigned long diff_ms;
 
        ret = fcntl(sock->fd, F_GETFL, 0);
        if (ret == -1) {
@@ -175,6 +150,9 @@ int connect_with_timeout(struct lttcomm_sock *sock)
                goto success;
        }
 
+       DBG("Asynchronous connect for sock %d, performing polling with"
+                       " timeout: %lums", sock->fd, timeout);
+
        /*
         * Perform poll loop following EINPROGRESS recommendation from
         * connect(2) man page.
@@ -201,12 +179,15 @@ int connect_with_timeout(struct lttcomm_sock *sock)
                        ret = getsockopt(sock->fd, SOL_SOCKET,
                                SO_ERROR, &optval, &optval_len);
                        if (ret) {
+                               PERROR("getsockopt");
                                goto error;
                        }
                        if (!optval) {
                                connect_ret = 0;
                                goto success;
                        } else {
+                               /* Get actual connect() errno from opt_val */
+                               errno = optval;
                                goto error;
                        }
                }
@@ -217,7 +198,12 @@ int connect_with_timeout(struct lttcomm_sock *sock)
                        connect_ret = ret;
                        goto error;
                }
-       } while (time_diff_ms(&cur_time, &orig_time) < timeout);
+               if (timespec_to_ms(timespec_abs_diff(cur_time, orig_time), &diff_ms) < 0) {
+                       ERR("timespec_to_ms input overflows milliseconds output");
+                       connect_ret = -1;
+                       goto error;
+               }
+       } while (diff_ms < timeout);
 
        /* Timeout */
        errno = ETIMEDOUT;
@@ -365,6 +351,9 @@ ssize_t lttcomm_recvmsg_inet6_sock(struct lttcomm_sock *sock, void *buf,
                len_last = iov[0].iov_len;
                ret = recvmsg(sock->fd, &msg, flags);
                if (ret > 0) {
+                       if (flags & MSG_DONTWAIT) {
+                               goto end;
+                       }
                        iov[0].iov_base += ret;
                        iov[0].iov_len -= ret;
                        assert(ret <= len_last);
@@ -376,7 +365,7 @@ ssize_t lttcomm_recvmsg_inet6_sock(struct lttcomm_sock *sock, void *buf,
                ret = len;
        }
        /* Else ret = 0 meaning an orderly shutdown. */
-
+end:
        return ret;
 }