Hi Jukka, On Fri, Oct 2, 2015 at 12:29 AM, Jukka Rissanen < [email protected]> wrote:
> Hi Naveen, > > On to, 2015-10-01 at 23:00 -0700, Naveen Singh wrote: > > On Thu, Oct 1, 2015 at 6:26 AM, Patrik Flykt < > [email protected]> > > wrote: > > > > > > > > Hi, > > > > > > On Wed, 2015-09-30 at 22:08 -0700, Naveen Singh wrote: > > > > From: Naveen Singh <[email protected]> > > > > > > > > Current NTP code is written with an assumption that timeserver is > > > > always an IPv4 address. If there is an IPv6 timeserver then the > socket > > > > operation would fail with error as Permission denied (13). This > change in > > > > ntp.c ensures that code works fine with both IPv4 and IPv6 address. > > > > --- > > > > src/ntp.c | 129 > > > ++++++++++++++++++++++++++++++++++++++++++++++++-------------- > > > > 1 file changed, 101 insertions(+), 28 deletions(-) > > > > > > This was patch version 2, so the next one is version 3. Add the version > > > to the Subject: line as [PATCH v3], this can be done with > > > 'git ... --subject-prefix="PATCH v3" ...'. > > > > > > > diff --git a/src/ntp.c b/src/ntp.c > > > > index 2c313a4..a55365d 100644 > > > > --- a/src/ntp.c > > > > +++ b/src/ntp.c > > > > @@ -18,7 +18,6 @@ > > > > * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA > > > 02110-1301 USA > > > > * > > > > */ > > > > - > > > > #ifdef HAVE_CONFIG_H > > > > #include <config.h> > > > > #endif > > > > @@ -34,6 +33,7 @@ > > > > #include <netinet/in.h> > > > > #include <netinet/ip.h> > > > > #include <arpa/inet.h> > > > > +#include <netdb.h> > > > > > > > > #include <glib.h> > > > > > > > > @@ -117,12 +117,12 @@ static struct timespec mtx_time; > > > > static int transmit_fd = 0; > > > > > > > > static char *timeserver = NULL; > > > > -static struct sockaddr_in timeserver_addr; > > > > +static struct sockaddr_storage timeserver_addr; > > > > static gint poll_id = 0; > > > > static gint timeout_id = 0; > > > > static guint retries = 0; > > > > > > > > -static void send_packet(int fd, const char *server, uint32_t > timeout); > > > > +static void send_packet(int fd, const char *server, uint32_t > timeout, > > > int family); > > > > > > > > static void next_server(void) > > > > { > > > > @@ -143,17 +143,21 @@ static gboolean send_timeout(gpointer > user_data) > > > > if (retries++ == NTP_SEND_RETRIES) > > > > next_server(); > > > > else > > > > - send_packet(transmit_fd, timeserver, timeout << 1); > > > > + send_packet(transmit_fd, timeserver, timeout << 1, > > > timeserver_addr.ss_family); > > > > > > > > return FALSE; > > > > } > > > > > > > > -static void send_packet(int fd, const char *server, uint32_t > timeout) > > > > +static void send_packet(int fd, const char *server, uint32_t > timeout, > > > int family) > > > > > > Instead of supplying a char *server, why don't we give a struct > > > sockaddr* instead? What's the purpose of carrying the server > > > "name" (nah, the IP address as a string), if it is already resolved in > > > the calling function? BTW, it is available as timeserver_addr, so do we > > > really need any of this information here? > > > > > > > Yes it makes sense but I am not sure sockaddr * is the one we should us. > It > > will not be able to hold IPv6 address which is 16 bytes. So I guess > > sockaddr_storage* would be the right thing. Do you agree? If you look i > > changed type of timeserver_addr to sockaddr_storage. Do you agree with > this? > > > > /* Structure describing a generic socket address. */ > > struct sockaddr > > { > > __SOCKADDR_COMMON (sa_); /* Common data: address family and > length. > > */ > > char sa_data[14]; /* Address data. */ > > }; > > > > > > You should never instantiate (== have a variable "struct sockaddr > myaddr") because there is not enough space as you noticed. You either > have a "struct sockaddr_in myaddr" or "struct sockaddr_in6 myaddr" and > then you just cast "struct sockaddr *" to correct variable. > There is no need to use sockaddr_storage here. > Exactly this is what I am saying.My concern is for the type of timeserver_addr which is used for storing the IP address of the server. It cannot be sockaddr. It needs to be sockaddr_storage. Where we know what IP address we are using we can use sockaddr_in or sockaddr_in6 and hen cast it to sockaddr *. Does this make sense? Do you agree? > > > > > > > { > > > > struct ntp_msg msg; > > > > - struct sockaddr_in addr; > > > > + struct sockaddr_in in4addr; > > > > + struct sockaddr_in6 in6addr; > > > > + struct sockaddr * addr; > > > > struct timeval transmit_timeval; > > > > ssize_t len; > > > > + int size; > > > > + unsigned char * addrptr; > > > > > > > > /* > > > > * At some point, we could specify the actual system precision > > > with: > > > > @@ -168,10 +172,29 @@ static void send_packet(int fd, const char > > > *server, uint32_t timeout) > > > > msg.poll = 10; // max > > > > msg.precision = NTP_PRECISION_S; > > > > > > > > - memset(&addr, 0, sizeof(addr)); > > > > - addr.sin_family = AF_INET; > > > > - addr.sin_port = htons(123); > > > > - addr.sin_addr.s_addr = inet_addr(server); > > > > + if (family == AF_INET) { > > > > + memset(&in4addr, 0, sizeof(in4addr)); > > > > + in4addr.sin_family = AF_INET; > > > > + in4addr.sin_port = htons(123); > > > > + size = sizeof(in4addr); > > > > + addrptr = (unsigned char *)&in4addr.sin_addr.s_addr; > > > > + addr = (struct sockaddr *)&in4addr; > > > > + } else if (family == AF_INET6){ > > > > + memset(&in6addr, 0, sizeof(in6addr)); > > > > + in6addr.sin6_family = AF_INET6; > > > > + in6addr.sin6_port = htons(123); > > > > + size = sizeof(in6addr); > > > > + addrptr = in6addr.sin6_addr.__in6_u.__u6_addr8; > > > > + addr = (struct sockaddr *)&in6addr; > > > > + } else { > > > > + DBG("wrong family type"); > > > > + return; > > > > + } > > > > + if (inet_pton(family, server, addrptr) == 0) > > > > + { > > > > + DBG("cannot convert ip address string"); > > > > + return; > > > > + } > > > > > > The above is unnecessary. You already have timeserver_addr set or the > > > function gets a sockaddr * to use. > > > > > > > Agreed. If we pass sockaddr_storage*. > > No, sockaddr * is enough. > > > > > > > > > > gettimeofday(&transmit_timeval, NULL); > > > > clock_gettime(CLOCK_MONOTONIC, &mtx_time); > > > > @@ -180,7 +203,7 @@ static void send_packet(int fd, const char > *server, > > > uint32_t timeout) > > > > msg.xmttime.fraction = htonl(transmit_timeval.tv_usec * 1000); > > > > > > > > len = sendto(fd, &msg, sizeof(msg), MSG_DONTWAIT, > > > > - &addr, sizeof(addr)); > > > > + addr, size); > > > > > > Use the stored timeserver_addr or supplied sockaddr * family > information > > > to set the size to either sizeof(struct sockaddr_in) or sizeof(struct > > > sockaddr_in6). > > > > > I guess this is what i am doing. But will double confirm. > > > > > > > > > if (len < 0) { > > > > connman_error("Time request for server %s failed > (%d/%s)", > > > > server, errno, strerror(errno)); > > > > @@ -213,7 +236,7 @@ static gboolean next_poll(gpointer user_data) > > > > if (!timeserver || transmit_fd == 0) > > > > return FALSE; > > > > > > > > - send_packet(transmit_fd, timeserver, NTP_SEND_TIMEOUT); > > > > + send_packet(transmit_fd, timeserver, NTP_SEND_TIMEOUT, > > > timeserver_addr.ss_family); > > > > > > > > return FALSE; > > > > } > > > > @@ -363,7 +386,7 @@ static gboolean received_data(GIOChannel > *channel, > > > GIOCondition condition, > > > > gpointer > user_data) > > > > { > > > > unsigned char buf[128]; > > > > - struct sockaddr_in sender_addr; > > > > + struct sockaddr_storage sender_addr; > > > > struct msghdr msg; > > > > struct iovec iov; > > > > struct cmsghdr *cmsg; > > > > @@ -396,9 +419,18 @@ static gboolean received_data(GIOChannel > *channel, > > > GIOCondition condition, > > > > if (len < 0) > > > > return TRUE; > > > > > > > > - if (timeserver_addr.sin_addr.s_addr != > sender_addr.sin_addr.s_addr) > > > > - /* only accept messages from the timeserver */ > > > > + if (sender_addr.ss_family == AF_INET) { > > > > + if (((struct sockaddr_in > > > *)×erver_addr)->sin_addr.s_addr != ((struct sockaddr_in > > > *)&sender_addr)->sin_addr.s_addr) > > > > + return TRUE; > > > > + } else if(sender_addr.ss_family == AF_INET6) { > > > > + if (memcmp(((struct sockaddr_in6 > > > *)×erver_addr)->sin6_addr.__in6_u.__u6_addr8, > > > > + ((struct sockaddr_in6 > > > *)&sender_addr)->sin6_addr.__in6_u.__u6_addr8, > > > > + 16) != 0) > > > > > > Use memcmp for both of these. First check address families, if they > > > match the size can be deduced (for example as above) and have only a > > > single memcmp to do the matching. > > > > > Agreed. > > > > > > > > > + return TRUE; > > > > + } else { > > > > + connman_error("Not a valid family type"); > > > > return TRUE; > > > > + } > > > > > > > > tv = NULL; > > > > clock_gettime(CLOCK_MONOTONIC, &mrx_time); > > > > @@ -422,36 +454,78 @@ static gboolean received_data(GIOChannel > *channel, > > > GIOCondition condition, > > > > static void start_ntp(char *server) > > > > { > > > > GIOChannel *channel; > > > > - struct sockaddr_in addr; > > > > + struct sockaddr * addr; > > > > + struct sockaddr_in in4addr; > > > > + struct sockaddr_in6 in6addr; > > > > + struct addrinfo hint; > > > > + struct addrinfo *info; > > > > + int family; > > > > int tos = IPTOS_LOWDELAY, timestamp = 1; > > > > + int size; > > > > + int ret; > > > > > > > > if (!server) > > > > return; > > > > > > > > - DBG("server %s", server); > > > > + memset(&hint, 0, sizeof(hint)); > > > > + hint.ai_family = AF_UNSPEC; > > > > + hint.ai_flags = AI_NUMERICHOST; > > > > + ret = getaddrinfo(server, NULL, &hint, &info); > > > > + > > > > + if (ret) { > > > > + connman_error("cannot get server info"); > > > > + return; > > > > + } > > > > + > > > > + family = info->ai_family; > > > > + freeaddrinfo(info); > > > > > > Before throwing away info, the address is already available as > > > ->sin6_addr or ->sin_addr. See man getaddrinfo. Store the address and > > > the address family in timeserver_addr. > > > > > > I guess this may not be correct as getaddrinfo gives us a pointer to > > sockaddr which may not be able to contain the 16 byte IPv6 address. Do > you > > agree? I guess using inet_pton is the best way. > > > > > > + > > > > + DBG("server %s family %d", server, family); > > > > > > > > if (channel_watch > 0) > > > > goto send; > > > > > > > > - transmit_fd = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0); > > > > - if (transmit_fd < 0) { > > > > + transmit_fd = socket(family, SOCK_DGRAM | SOCK_CLOEXEC, 0); > > > > + if (transmit_fd <= 0) { > > > > connman_error("Failed to open time server socket"); > > > > return; > > > > } > > > > > > > > - memset(&addr, 0, sizeof(addr)); > > > > - addr.sin_family = AF_INET; > > > > + if (family == AF_INET) { > > > > + memset(&in4addr, 0, sizeof(in4addr)); > > > > + in4addr.sin_family = family; > > > > + addr = (struct sockaddr *)&in4addr; > > > > + size = sizeof(in4addr); > > > > + if (inet_pton(family, server, &(((struct sockaddr_in > > > *)×erver_addr)->sin_addr.s_addr)) == 0) { > > > > + DBG("cannot convert ipv4 address string"); > > > > + } > > > > + } else if (family == AF_INET6) { > > > > + memset(&in6addr, 0, sizeof(in6addr)); > > > > + in6addr.sin6_family = family; > > > > + addr = (struct sockaddr *)&in6addr; > > > > + size = sizeof(in6addr); > > > > + if (inet_pton(family, server, ((struct sockaddr_in6 > > > *)×erver_addr)->sin6_addr.__in6_u.__u6_addr8) == 0) { > > > > + DBG("cannot convert ipv6 address string"); > > > > + } > > > > + } else { > > > > + connman_error("Family not correct"); > > > > + return; > > > > + } > > > > > > No need for the above, look into the 'info' supplied to getaddrinfo() > > > above. > > > > > > > - if (bind(transmit_fd, (struct sockaddr *) &addr, sizeof(addr)) > < > > > 0) { > > > > + timeserver_addr.ss_family = family; > > > > + > > > > + if (bind(transmit_fd, (struct sockaddr *) addr, size) < 0) { > > > > connman_error("Failed to bind time server socket"); > > > > close(transmit_fd); > > > > return; > > > > } > > > > > > > > - if (setsockopt(transmit_fd, IPPROTO_IP, IP_TOS, &tos, > sizeof(tos)) > > > < 0) { > > > > - connman_error("Failed to set type of service option"); > > > > - close(transmit_fd); > > > > - return; > > > > + if (family == AF_INET) { > > > > + if (setsockopt(transmit_fd, IPPROTO_IP, IP_TOS, &tos, > > > sizeof(tos)) < 0) { > > > > + connman_error("Failed to set type of service > > > option"); > > > > + close(transmit_fd); > > > > + return; > > > > + } > > > > } > > > > > > > > if (setsockopt(transmit_fd, SOL_SOCKET, SO_TIMESTAMP, > ×tamp, > > > > @@ -479,7 +553,7 @@ static void start_ntp(char *server) > > > > g_io_channel_unref(channel); > > > > > > > > send: > > > > - send_packet(transmit_fd, server, NTP_SEND_TIMEOUT); > > > > + send_packet(transmit_fd, server, NTP_SEND_TIMEOUT, family); > > > > } > > > > > > > > int __connman_ntp_start(char *server) > > > > @@ -493,7 +567,6 @@ int __connman_ntp_start(char *server) > > > > g_free(timeserver); > > > > > > > > timeserver = g_strdup(server); > > > > - timeserver_addr.sin_addr.s_addr = inet_addr(server); > > > > > > > > start_ntp(timeserver); > > > > > > > > > > Patrik > > > > > > Regards > > > > > Naveen > > > > Cheers, > Jukka > > > _______________________________________________ connman mailing list [email protected] https://lists.connman.net/mailman/listinfo/connman
