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Store the length of name servers addresses 

Always passing sizeof(struct sockaddr_storage) only works, by accident, on Linux.
It fails on macOS and BSD.
This commit is contained in:
Frank Denis 2016-11-04 16:59:19 +01:00
parent 756dc2005d
commit dd1d12e8fb
3 changed files with 12 additions and 6 deletions
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4
src/client.c
View File

@ -352,8 +352,8 @@ send_query(uint8_t *hostname)
DEBUG(4, " Sendquery: id %5d name[0] '%c'", q.id, hostname[0]);
sendto(this.dns_fd, packet, len, 0, (struct sockaddr*) &this.nameserv_addrs[this.current_nameserver],
sizeof(struct sockaddr_storage));
sendto(this.dns_fd, packet, len, 0, (struct sockaddr*) &this.nameserv_addrs[this.current_nameserver].addr,
this.nameserv_addrs[this.current_nameserver].len);
client_rotate_nameserver();

7
src/client.h
View File

@ -26,6 +26,11 @@ extern int stats;
#define PENDING_QUERIES_LENGTH (MAX(this.windowsize_up, this.windowsize_down) * 4)
#define INSTANCE this
struct nameserv {
struct sockaddr_storage addr;
int len;
};
struct client_instance {
int max_downstream_frag_size;
int autodetect_frag_size;
@ -37,7 +42,7 @@ struct client_instance {
/* DNS nameserver info */
char **nameserv_hosts;
size_t nameserv_hosts_len;
struct sockaddr_storage *nameserv_addrs;
struct nameserv *nameserv_addrs;
size_t nameserv_addrs_count;
int current_nameserver;
struct sockaddr_storage raw_serv;

7
src/iodine.c
View File

@ -622,7 +622,7 @@ main(int argc, char **argv)
// Preallocate memory with expected number of hosts
this.nameserv_hosts = malloc(sizeof(char *) * this.nameserv_hosts_len);
this.nameserv_addrs = malloc(sizeof(struct sockaddr_storage) * this.nameserv_hosts_len);
this.nameserv_addrs = malloc(sizeof(struct nameserv) * this.nameserv_hosts_len);
if (argc == 0) {
usage();
@ -644,7 +644,8 @@ main(int argc, char **argv)
errx(1, "Cannot lookup nameserver '%s': %s ",
nameserv_host, gai_strerror(nameservaddr_len));
}
memcpy(&this.nameserv_addrs[n], &nameservaddr, sizeof(struct sockaddr_storage));
this.nameserv_addrs[n].len = nameservaddr_len;
memcpy(&this.nameserv_addrs[n].addr, &nameservaddr, sizeof(struct sockaddr_storage));
this.nameserv_addrs_count ++;
nameserv_host = NULL;
}
@ -733,7 +734,7 @@ main(int argc, char **argv)
fprintf(stderr, "Sending DNS queries for %s to ", this.topdomain);
for (int a = 0; a < this.nameserv_addrs_count; a++)
fprintf(stderr, "%s%s", format_addr(&this.nameserv_addrs[a], sizeof(struct sockaddr_storage)),
fprintf(stderr, "%s%s", format_addr(&this.nameserv_addrs[a].addr, this.nameserv_addrs[a].len),
(a != this.nameserv_addrs_count - 1) ? ", " : "");
fprintf(stderr, "\n");