diff options
| author | Lennart Poettering <lennart@poettering.net> | 2016-02-15 22:50:01 +0100 |
|---|---|---|
| committer | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-05-25 11:56:39 -0400 |
| commit | 2eb25bc571d6b5babe50ab116c2619e17de39ec9 (patch) | |
| tree | 3df98494a97998a379936551a08456ea86241e2e /src/libsystemd-network/sd-dhcp-client.c | |
| parent | 95adafc428b5b4be0ddd4d43a7b96658390388bc (diff) | |
networkd: FIONREAD is not reliable on some sockets
Fixes: #2457
Diffstat (limited to 'src/libsystemd-network/sd-dhcp-client.c')
| -rw-r--r-- | src/libsystemd-network/sd-dhcp-client.c | 23 |
1 files changed, 9 insertions, 14 deletions
diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c index cad1a52c09..729ef880ce 100644 --- a/src/libsystemd-network/sd-dhcp-client.c +++ b/src/libsystemd-network/sd-dhcp-client.c @@ -1525,20 +1525,17 @@ static int client_receive_message_udp(sd_event_source *s, int fd, uint32_t revents, void *userdata) { sd_dhcp_client *client = userdata; _cleanup_free_ DHCPMessage *message = NULL; - int buflen = 0, len, r; const struct ether_addr zero_mac = { { 0, 0, 0, 0, 0, 0 } }; const struct ether_addr *expected_chaddr = NULL; uint8_t expected_hlen = 0; + ssize_t len, buflen; assert(s); assert(client); - r = ioctl(fd, FIONREAD, &buflen); - if (r < 0) - return -errno; - else if (buflen < 0) - /* this can't be right */ - return -EIO; + buflen = next_datagram_size_fd(fd); + if (buflen < 0) + return buflen; message = malloc0(buflen); if (!message) @@ -1616,17 +1613,15 @@ static int client_receive_message_raw(sd_event_source *s, int fd, }; struct cmsghdr *cmsg; bool checksum = true; - int buflen = 0, len, r; + ssize_t buflen, len; + int r; assert(s); assert(client); - r = ioctl(fd, FIONREAD, &buflen); - if (r < 0) - return -errno; - else if (buflen < 0) - /* this can't be right */ - return -EIO; + buflen = next_datagram_size_fd(fd); + if (buflen < 0) + return buflen; packet = malloc0(buflen); if (!packet) |