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New libdns snapshot

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This commit is contained in:
Justus Winter 2016-12-12 16:48:41 +01:00
parent 1e766d35d1
commit 135d878504
2 changed files with 160 additions and 63 deletions
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215
dirmngr/dns.c
View File

@ -4585,10 +4585,11 @@ dns_error_t dns_trace_fput(const struct dns_trace_event *te, const void *data, s
}
static void dns_trace_setcname(struct dns_trace *trace, const char *host, const struct sockaddr *addr) {
struct dns_trace_cname *cname;
if (!trace || !trace->fp)
return;
struct dns_trace_cname *cname = &trace->cnames.base[trace->cnames.p];
cname = &trace->cnames.base[trace->cnames.p];
dns_strlcpy(cname->host, host, sizeof cname->host);
memcpy(&cname->addr, addr, DNS_PP_MIN(dns_sa_len(addr), sizeof cname->addr));
@ -4609,10 +4610,10 @@ static const char *dns_trace_cname(struct dns_trace *trace, const struct sockadd
}
static void dns_trace_res_submit(struct dns_trace *trace, const char *qname, enum dns_type qtype, enum dns_class qclass, int error) {
struct dns_trace_event te;
if (!trace || !trace->fp)
return;
struct dns_trace_event te;
dns_te_init(&te, DNS_TE_RES_SUBMIT);
dns_strlcpy(te.res_submit.qname, qname, sizeof te.res_submit.qname);
te.res_submit.qtype = qtype;
@ -4622,25 +4623,27 @@ static void dns_trace_res_submit(struct dns_trace *trace, const char *qname, enu
}
static void dns_trace_res_fetch(struct dns_trace *trace, const struct dns_packet *packet, int error) {
struct dns_trace_event te;
const void *data;
size_t datasize;
if (!trace || !trace->fp)
return;
struct dns_trace_event te;
dns_te_init(&te, DNS_TE_RES_FETCH);
const void *data = (packet)? packet->data : NULL;
size_t datasize = (packet)? packet->end : 0;
data = (packet)? packet->data : NULL;
datasize = (packet)? packet->end : 0;
te.res_fetch.error = error;
dns_trace_tag_and_put(trace, &te, data, datasize);
}
static void dns_trace_so_submit(struct dns_trace *trace, const struct dns_packet *packet, const struct sockaddr *haddr, int error) {
struct dns_trace_event te;
const char *cname;
if (!trace || !trace->fp)
return;
struct dns_trace_event te;
dns_te_init(&te, DNS_TE_SO_SUBMIT);
memcpy(&te.so_submit.haddr, haddr, DNS_PP_MIN(dns_sa_len(haddr), sizeof te.so_submit.haddr));
const char *cname;
if ((cname = dns_trace_cname(trace, haddr)))
dns_strlcpy(te.so_submit.hname, cname, sizeof te.so_submit.hname);
te.so_submit.error = error;
@ -4648,32 +4651,34 @@ static void dns_trace_so_submit(struct dns_trace *trace, const struct dns_packet
}
static void dns_trace_so_verify(struct dns_trace *trace, const struct dns_packet *packet, int error) {
struct dns_trace_event te;
if (!trace || !trace->fp)
return;
struct dns_trace_event te;
dns_te_init(&te, DNS_TE_SO_VERIFY);
te.so_verify.error = error;
dns_trace_tag_and_put(trace, &te, packet->data, packet->end);
}
static void dns_trace_so_fetch(struct dns_trace *trace, const struct dns_packet *packet, int error) {
struct dns_trace_event te;
const void *data;
size_t datasize;
if (!trace || !trace->fp)
return;
struct dns_trace_event te;
dns_te_init(&te, DNS_TE_SO_FETCH);
const void *data = (packet)? packet->data : NULL;
size_t datasize = (packet)? packet->end : 0;
data = (packet)? packet->data : NULL;
datasize = (packet)? packet->end : 0;
te.so_fetch.error = error;
dns_trace_tag_and_put(trace, &te, data, datasize);
}
static void dns_trace_sys_connect(struct dns_trace *trace, int fd, int socktype, const struct sockaddr *dst, int error) {
struct dns_trace_event te;
if (!trace || !trace->fp)
return;
struct dns_trace_event te;
dns_te_init(&te, DNS_TE_SYS_CONNECT);
dns_te_initname(&te.sys_connect.src, fd, &getsockname);
memcpy(&te.sys_connect.dst, dst, DNS_PP_MIN(dns_sa_len(dst), sizeof te.sys_connect.dst));
@ -4683,10 +4688,10 @@ static void dns_trace_sys_connect(struct dns_trace *trace, int fd, int socktype,
}
static void dns_trace_sys_send(struct dns_trace *trace, int fd, int socktype, const void *data, size_t datasize, int error) {
struct dns_trace_event te;
if (!trace || !trace->fp)
return;
struct dns_trace_event te;
dns_te_init(&te, DNS_TE_SYS_SEND);
dns_te_initnames(&te.sys_send.src, &te.sys_send.dst, fd);
te.sys_send.socktype = socktype;
@ -4695,10 +4700,10 @@ static void dns_trace_sys_send(struct dns_trace *trace, int fd, int socktype, co
}
static void dns_trace_sys_recv(struct dns_trace *trace, int fd, int socktype, const void *data, size_t datasize, int error) {
struct dns_trace_event te;
if (!trace || !trace->fp)
return;
struct dns_trace_event te;
dns_te_init(&te, DNS_TE_SYS_RECV);
dns_te_initnames(&te.sys_recv.dst, &te.sys_recv.src, fd);
te.sys_recv.socktype = socktype;
@ -4710,6 +4715,9 @@ static dns_error_t dns_trace_dump_packet(struct dns_trace *trace, const char *pr
struct dns_packet *packet = NULL;
char *line = NULL, *p;
size_t size = 1, skip = 0;
struct dns_rr_i records;
struct dns_p_lines_i lines;
size_t len, count;
int error;
if (!(packet = dns_p_make(datasize, &error)))
@ -4724,9 +4732,9 @@ resize:
line = p;
size *= 2;
struct dns_rr_i records = { 0 };
struct dns_p_lines_i lines = { 0 };
size_t len, count = 0;
memset(&records, 0, sizeof records);
memset(&lines, 0, sizeof lines);
count = 0;
while ((len = dns_p_lines(line, size, &error, packet, &records, &lines))) {
if (!(len < size)) {
@ -4899,22 +4907,22 @@ dns_error_t dns_trace_dump(struct dns_trace *trace, FILE *fp) {
break;
case DNS_TE_SYS_CONNECT: {
int socktype = te->sys_connect.socktype;
fprintf(fp, "dns_sys_connect:\n");
dns_trace_dump_meta(trace, " ", te, state.elapsed, fp);
dns_trace_dump_addr(trace, " src: ", &te->sys_connect.src, fp);
dns_trace_dump_addr(trace, " dst: ", &te->sys_connect.dst, fp);
int socktype = te->sys_connect.socktype;
fprintf(fp, " socktype: %d (%s)\n", socktype, ((socktype == SOCK_STREAM)? "SOCK_STREAM" : (socktype == SOCK_DGRAM)? "SOCK_DGRAM" : "?"));
dns_trace_dump_error(trace, " error: ", te->sys_connect.error, fp);
break;
}
case DNS_TE_SYS_SEND: {
int socktype = te->sys_send.socktype;
fprintf(fp, "dns_sys_send:\n");
dns_trace_dump_meta(trace, " ", te, state.elapsed, fp);
dns_trace_dump_addr(trace, " src: ", &te->sys_send.src, fp);
dns_trace_dump_addr(trace, " dst: ", &te->sys_send.dst, fp);
int socktype = te->sys_send.socktype;
fprintf(fp, " socktype: %d (%s)\n", socktype, ((socktype == SOCK_STREAM)? "SOCK_STREAM" : (socktype == SOCK_DGRAM)? "SOCK_DGRAM" : "?"));
dns_trace_dump_error(trace, " error: ", te->sys_send.error, fp);
@ -4927,11 +4935,11 @@ dns_error_t dns_trace_dump(struct dns_trace *trace, FILE *fp) {
break;
}
case DNS_TE_SYS_RECV: {
int socktype = te->sys_recv.socktype;
fprintf(fp, "dns_sys_recv:\n");
dns_trace_dump_meta(trace, " ", te, state.elapsed, fp);
dns_trace_dump_addr(trace, " src: ", &te->sys_recv.src, fp);
dns_trace_dump_addr(trace, " dst: ", &te->sys_recv.dst, fp);
int socktype = te->sys_recv.socktype;
fprintf(fp, " socktype: %d (%s)\n", socktype, ((socktype == SOCK_STREAM)? "SOCK_STREAM" : (socktype == SOCK_DGRAM)? "SOCK_DGRAM" : "?"));
dns_trace_dump_error(trace, " error: ", te->sys_recv.error, fp);
@ -7118,8 +7126,11 @@ enum {
DNS_SO_SOCKS_INIT,
DNS_SO_SOCKS_CONN,
DNS_SO_SOCKS_HELLO_SEND,
DNS_SO_SOCKS_HELLO_RECV,
DNS_SO_SOCKS_AUTH_SEND,
DNS_SO_SOCKS_AUTH_RECV,
DNS_SO_SOCKS_REQUEST_PREPARE,
DNS_SO_SOCKS_REQUEST_SEND,
DNS_SO_SOCKS_REQUEST_RECV,
DNS_SO_SOCKS_REQUEST_RECV_V6,
@ -7424,6 +7435,30 @@ static _Bool dns_so_tcp_keep(struct dns_socket *so) {
} /* dns_so_tcp_keep() */
/* Convenience functions for sending non-DNS data. */
/* Set up everything for sending LENGTH octets. Returns the buffer
for the data. */
static unsigned char *dns_so_tcp_send_buffer(struct dns_socket *so, size_t length) {
/* Skip the length octets, we are not doing DNS. */
so->qout = 2;
so->query->end = length;
return so->query->data;
}
/* Set up everything for receiving LENGTH octets. */
static void dns_so_tcp_recv_expect(struct dns_socket *so, size_t length) {
/* Skip the length octets, we are not doing DNS. */
so->apos = 2;
so->alen = length;
}
/* Returns the buffer containing the received data. */
static unsigned char *dns_so_tcp_recv_buffer(struct dns_socket *so) {
return so->answer->data;
}
#if defined __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warray-bounds"
@ -7500,10 +7535,7 @@ static int dns_so_tcp_recv(struct dns_socket *so) {
int dns_so_check(struct dns_socket *so) {
int error;
size_t n;
/* XXX */
unsigned char *buffer;
int method;
retry:
switch (so->state) {
@ -7595,7 +7627,9 @@ retry:
goto error;
so->state++;
case DNS_SO_SOCKS_CONN:
case DNS_SO_SOCKS_CONN: {
unsigned char method;
error = dns_connect(so->tcp, (struct sockaddr *)so->opts.socks_host, dns_sa_len(so->opts.socks_host));
dns_trace_sys_connect(so->trace, so->tcp, SOCK_STREAM, (struct sockaddr *)so->opts.socks_host, error);
if (error && error != DNS_EISCONN)
@ -7609,37 +7643,32 @@ retry:
/* Create a new buffer for the handshake. */
dns_p_grow(&so->query);
/* Skip the two octets length field when
transmitting, send three octets. */
so->qout = 2;
so->query->end = 3;
buffer = so->query->data;
/* Negotiate method. */
buffer = dns_so_tcp_send_buffer(so, 3);
buffer[0] = 5; /* RFC-1928 VER field. */
buffer[1] = 1; /* NMETHODS */
if (0 /* XXX */)
if (so->opts.socks_user)
method = 2; /* Method: username/password authentication. */
else
method = 0; /* Method: No authentication required. */
buffer[2] = method;
so->state++;
case DNS_SO_SOCKS_AUTH_SEND:
}
case DNS_SO_SOCKS_HELLO_SEND:
if ((error = dns_so_tcp_send(so)))
goto error;
/* Skip the two length octets, and receive two octets. */
so->apos = 2;
so->alen = 2;
dns_so_tcp_recv_expect(so, 2);
so->state++;
case DNS_SO_SOCKS_AUTH_RECV:
case DNS_SO_SOCKS_HELLO_RECV: {
unsigned char method;
if ((error = dns_so_tcp_recv(so)))
goto error;
buffer = so->answer->data;
method = 0; /* XXX authentication not yet supported */
buffer = dns_so_tcp_recv_buffer(so);
method = so->opts.socks_user ? 2 : 0;
if (buffer[0] != 5 || buffer[1] != method) {
/* Socks server returned wrong version or does
not support our requested method. */
@ -7647,12 +7676,67 @@ retry:
goto error;
}
/* Skip the two octets length field when
transmitting. */
so->qout = 2;
buffer = so->query->data;
if (method == 0) {
/* No authentication, go ahead and send the
request. */
so->state = DNS_SO_SOCKS_REQUEST_PREPARE;
goto retry;
}
/* Prepare username/password sub-negotiation. */
if (! so->opts.socks_password) {
error = EINVAL; /* No password given. */
goto error;
} else {
size_t buflen, ulen, plen;
ulen = strlen(so->opts.socks_user);
plen = strlen(so->opts.socks_password);
if (!ulen || ulen > 255 || !plen || plen > 255) {
error = EINVAL; /* Credentials too long or too short. */
goto error;
}
buffer = dns_so_tcp_send_buffer(so, 3 + ulen + plen);
buffer[0] = 1; /* VER of the sub-negotiation. */
buffer[1] = (unsigned char) ulen;
buflen = 2;
memcpy (buffer+buflen, so->opts.socks_user, ulen);
buflen += ulen;
buffer[buflen++] = (unsigned char) plen;
memcpy (buffer+buflen, so->opts.socks_password, plen);
}
so->state++;
}
case DNS_SO_SOCKS_AUTH_SEND:
if ((error = dns_so_tcp_send(so)))
goto error;
/* Skip the two length octets, and receive two octets. */
dns_so_tcp_recv_expect(so, 2);
so->state++;
case DNS_SO_SOCKS_AUTH_RECV:
if ((error = dns_so_tcp_recv(so)))
goto error;
buffer = dns_so_tcp_recv_buffer(so);
if (buffer[0] != 1) {
/* SOCKS server returned wrong version. */
error = EPROTO;
goto error;
}
if (buffer[1]) {
/* SOCKS server denied access. */
error = EACCES;
goto error;
}
so->state++;
case DNS_SO_SOCKS_REQUEST_PREPARE:
/* Send request details (rfc-1928, 4). */
buffer = dns_so_tcp_send_buffer(so, so->remote.ss_family == AF_INET6 ? 22 : 10);
buffer[0] = 5; /* VER */
buffer[1] = 1; /* CMD = CONNECT */
buffer[2] = 0; /* RSV */
@ -7662,14 +7746,12 @@ retry:
buffer[3] = 4; /* ATYP = IPv6 */
memcpy (buffer+ 4, &addr_in6->sin6_addr.s6_addr, 16); /* DST.ADDR */
memcpy (buffer+20, &addr_in6->sin6_port, 2); /* DST.PORT */
so->query->end = 22;
} else {
struct sockaddr_in *addr_in = (struct sockaddr_in *)&so->remote;
buffer[3] = 1; /* ATYP = IPv4 */
memcpy (buffer+4, &addr_in->sin_addr.s_addr, 4); /* DST.ADDR */
memcpy (buffer+8, &addr_in->sin_port, 2); /* DST.PORT */
so->query->end = 10;
}
so->state++;
@ -7677,19 +7759,16 @@ retry:
if ((error = dns_so_tcp_send(so)))
goto error;
/* Skip the two length octets, and receive ten octets.
* This is the length of the response assuming a IPv4
* address is used. */
so->apos = 2;
so->alen = 10;
/* Expect ten octets. This is the length of the
* response assuming a IPv4 address is used. */
dns_so_tcp_recv_expect(so, 10);
so->state++;
case DNS_SO_SOCKS_REQUEST_RECV:
if ((error = dns_so_tcp_recv(so)))
goto error;
buffer = so->answer->data;
if (buffer[0] != 5 || buffer[2] != 0 ) {
buffer = dns_so_tcp_recv_buffer(so);
if (buffer[0] != 5 || buffer[2] != 0) {
/* Socks server returned wrong version or the
reserved field is not zero. */
error = EPROTO;
@ -7737,13 +7816,10 @@ retry:
goto error;
}
/* ATYP indicates a v6 address. Skip the two length
* octets, and receive twelve octets. This accounts
* for the remaining bytes assuming an IPv6 address is
/* Expect receive twelve octets. This accounts for
* the remaining bytes assuming an IPv6 address is
* used. */
so->apos = 2;
so->alen = 12;
dns_so_tcp_recv_expect(so, 12);
so->state++;
case DNS_SO_SOCKS_REQUEST_RECV_V6:
if ((error = dns_so_tcp_recv(so)))
@ -9997,6 +10073,8 @@ struct {
} memo;
struct sockaddr_storage socks_host;
const char *socks_user;
const char *socks_password;
} MAIN = {
.sort = &dns_rr_i_packet,
};
@ -10679,7 +10757,9 @@ static int resolve_query(int argc DNS_NOTUSED, char *argv[]) {
resconf()->options.recurse = recurse;
if (!(R = dns_res_open(resconf(), hosts(), dns_hints_mortal(hints(resconf(), &error)), cache(),
dns_opts(.socks_host=&MAIN.socks_host), &error)))
dns_opts(.socks_host=&MAIN.socks_host,
.socks_user=MAIN.socks_user,
.socks_password=MAIN.socks_password), &error)))
panic("%s: %s", MAIN.qname, dns_strerror(error));
dns_res_settrace(R, trace("w+b"));
@ -10966,6 +11046,7 @@ static void print_usage(const char *progname, FILE *fp) {
" -s HOW Sort records\n"
" -S ADDR Address of SOCKS server to use\n"
" -P PORT Port of SOCKS server to use\n"
" -A USER:PASSWORD Credentials for the SOCKS server\n"
" -f PATH Path to trace file\n"
" -v Be more verbose (-vv show packets; -vvv hexdump packets)\n"
" -V Print version info\n"
@ -11022,7 +11103,7 @@ int main(int argc, char **argv) {
atexit(&main_exit);
while (-1 != (ch = getopt(argc, argv, "q:t:c:n:l:z:s:S:P:f:vVh"))) {
while (-1 != (ch = getopt(argc, argv, "q:t:c:n:l:z:s:S:P:A:f:vVh"))) {
switch (ch) {
case 'c':
assert(MAIN.resconf.count < lengthof(MAIN.resconf.path));
@ -11102,6 +11183,18 @@ int main(int argc, char **argv) {
*dns_sa_port(MAIN.socks_host.ss_family, &MAIN.socks_host) = htons(atoi(optarg));
break;
case 'A': {
char *password;
if (! MAIN.socks_host.ss_family)
panic("-A without prior -S");
if (! (password = strchr(optarg, ':')))
panic("Usage: -A USER:PASSWORD");
*password = 0;
password += 1;
MAIN.socks_user = optarg;
MAIN.socks_password = password;
break;
}
case 'f':
MAIN.trace = optarg;

8
dirmngr/dns.h
View File

@ -533,7 +533,7 @@ struct dns_rr_i {
int follow;
int (*sort)();
int (*sort)(struct dns_rr *, struct dns_rr *, struct dns_rr_i *, struct dns_packet *);
unsigned args[2];
struct {
@ -1076,7 +1076,11 @@ struct dns_options {
} events;
/* Use this SOCKS server. */
struct sockaddr_storage *socks_host;
const struct sockaddr_storage *socks_host;
/* Credentials for the SOCKS server (optional). */
const char *socks_user;
const char *socks_password;
}; /* struct dns_options */