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timesync: always initialize structs when declaring them as far as possible with contsant values

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This commit is contained in:
Lennart Poettering 2014-05-05 21:47:09 +02:00
parent 43ba1b3e64
commit 5f8cfaee52
1 changed files with 34 additions and 24 deletions
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58
src/timesync/timesyncd.c
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@ -37,6 +37,7 @@
#include "util.h"
#include "sparse-endian.h"
#include "log.h"
#include "socket-util.h"
#include "sd-event.h"
#include "sd-daemon.h"
@ -111,7 +112,7 @@ struct Manager {
/* peer */
sd_event_source *event_receive;
char *server;
struct sockaddr_in server_addr;
union sockaddr_union server_addr;
int server_socket;
uint64_t packet_count;
@ -168,19 +169,24 @@ static double square(double d) {
}
static int sntp_send_request(Manager *m) {
struct ntp_msg ntpmsg = {};
struct sockaddr_in addr = {};
struct ntp_msg ntpmsg = {
/*
* "The client initializes the NTP message header, sends the request
* to the server, and strips the time of day from the Transmit
* Timestamp field of the reply. For this purpose, all the NTP
* header fields are set to 0, except the Mode, VN, and optional
* Transmit Timestamp fields."
*/
.field = NTP_FIELD(0, 4, NTP_MODE_CLIENT),
};
union sockaddr_union addr = {
.in.sin_family = AF_INET,
.in.sin_port = htobe16(123),
};
ssize_t len;
int r;
/*
* "The client initializes the NTP message header, sends the request
* to the server, and strips the time of day from the Transmit
* Timestamp field of the reply. For this purpose, all the NTP
* header fields are set to 0, except the Mode, VN, and optional
* Transmit Timestamp fields."
*/
ntpmsg.field = NTP_FIELD(0, 4, NTP_MODE_CLIENT);
/*
* Set transmit timestamp, remember it; the server will send that back
@ -195,10 +201,8 @@ static int sntp_send_request(Manager *m) {
ntpmsg.trans_time.sec = htobe32(m->trans_time.tv_sec + OFFSET_1900_1970);
ntpmsg.trans_time.frac = htobe32(m->trans_time.tv_nsec);
addr.sin_family = AF_INET;
addr.sin_port = htobe16(123);
addr.sin_addr.s_addr = inet_addr(m->server);
len = sendto(m->server_socket, &ntpmsg, sizeof(ntpmsg), MSG_DONTWAIT, &addr, sizeof(addr));
addr.in.sin_addr.s_addr = inet_addr(m->server);
len = sendto(m->server_socket, &ntpmsg, sizeof(ntpmsg), MSG_DONTWAIT, &addr.sa, sizeof(addr.in));
if (len == sizeof(ntpmsg)) {
m->pending = true;
log_debug("Sent NTP request to: %s", m->server);
@ -283,7 +287,11 @@ static int sntp_clock_watch(sd_event_source *source, int fd, uint32_t revents, v
/* wake up when the system time changes underneath us */
static int sntp_clock_watch_setup(Manager *m) {
struct itimerspec its = { .it_value.tv_sec = TIME_T_MAX };
struct itimerspec its = {
.it_value.tv_sec = TIME_T_MAX
};
_cleanup_close_ int fd = -1;
sd_event_source *source;
int r;
@ -472,7 +480,7 @@ static int sntp_receive_response(sd_event_source *source, int fd, uint32_t reven
struct cmsghdr cmsghdr;
uint8_t buf[CMSG_SPACE(sizeof(struct timeval))];
} control;
struct sockaddr_in server_addr;
union sockaddr_union server_addr;
struct msghdr msghdr = {
.msg_iov = &iov,
.msg_iovlen = 1,
@ -509,7 +517,7 @@ static int sntp_receive_response(sd_event_source *source, int fd, uint32_t reven
return -EINVAL;
}
if (m->server_addr.sin_addr.s_addr != server_addr.sin_addr.s_addr) {
if (m->server_addr.in.sin_addr.s_addr != server_addr.in.sin_addr.s_addr) {
log_debug("Response from unknown server. Disconnecting.");
return -EINVAL;
}
@ -657,8 +665,8 @@ static int sntp_server_connect(Manager *m, const char *server) {
s = NULL;
zero(m->server_addr);
m->server_addr.sin_family = AF_INET;
m->server_addr.sin_addr.s_addr = inet_addr(server);
m->server_addr.in.sin_family = AF_INET;
m->server_addr.in.sin_addr.s_addr = inet_addr(server);
m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC;
@ -687,8 +695,12 @@ static void sntp_server_disconnect(Manager *m) {
}
static int sntp_listen_setup(Manager *m) {
union sockaddr_union addr = {
.in.sin_family = AF_INET,
};
_cleanup_close_ int fd = -1;
struct sockaddr_in addr;
const int on = 1;
const int tos = IPTOS_LOWDELAY;
int r;
@ -697,9 +709,7 @@ static int sntp_listen_setup(Manager *m) {
if (fd < 0)
return -errno;
zero(addr);
addr.sin_family = AF_INET;
r = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
r = bind(fd, &addr.sa, sizeof(addr.in));
if (r < 0)
return -errno;