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sd-dhcp6-client: modernize dhcp6_option_parse()

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- merge dhcp6_option_parse() with option_parse_hdr().
- do not assign/update any values on error.
- use assert() instead of assert_return(), as the assertions cannot
  be triggered by a library user.
This commit is contained in:
Yu Watanabe 2021-09-23 14:58:28 +09:00
parent dc95e21d33
commit b89a3758e9
4 changed files with 77 additions and 82 deletions
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10
src/libsystemd-network/dhcp6-internal.h
View File

@ -101,8 +101,14 @@ int dhcp6_option_append_fqdn(uint8_t **buf, size_t *buflen, const char *fqdn);
int dhcp6_option_append_user_class(uint8_t **buf, size_t *buflen, char * const *user_class);
int dhcp6_option_append_vendor_class(uint8_t **buf, size_t *buflen, char * const *user_class);
int dhcp6_option_append_vendor_option(uint8_t **buf, size_t *buflen, OrderedHashmap *vendor_options);
int dhcp6_option_parse(uint8_t **buf, size_t *buflen, uint16_t *optcode,
size_t *optlen, uint8_t **optvalue);
int dhcp6_option_parse(
const uint8_t *buf,
size_t buflen,
size_t *offset,
uint16_t *ret_option_code,
size_t *ret_option_data_len,
const uint8_t **ret_option_data);
int dhcp6_option_parse_status(DHCP6Option *option, size_t len);
int dhcp6_option_parse_ia(sd_dhcp6_client *client, DHCP6Option *iaoption, be32_t iaid, DHCP6IA *ia, uint16_t *ret_status_code);
int dhcp6_option_parse_ip6addrs(const uint8_t *optval, uint16_t optlen,

62
src/libsystemd-network/dhcp6-option.c
View File

@ -370,47 +370,39 @@ int dhcp6_option_append_vendor_class(uint8_t **buf, size_t *buflen, char * const
return dhcp6_option_append(buf, buflen, SD_DHCP6_OPTION_VENDOR_CLASS, total, p);
}
static int option_parse_hdr(uint8_t **buf, size_t *buflen, uint16_t *optcode, size_t *optlen) {
DHCP6Option *option = (DHCP6Option*) *buf;
uint16_t len;
int dhcp6_option_parse(
const uint8_t *buf,
size_t buflen,
size_t *offset,
uint16_t *ret_option_code,
size_t *ret_option_data_len,
const uint8_t **ret_option_data) {
assert_return(buf, -EINVAL);
assert_return(optcode, -EINVAL);
assert_return(optlen, -EINVAL);
const DHCP6Option *option;
size_t len;
if (*buflen < offsetof(DHCP6Option, data))
return -ENOMSG;
assert(buf);
assert(offset);
assert(ret_option_code);
assert(ret_option_data_len);
assert(ret_option_data);
if (buflen < offsetof(DHCP6Option, data))
return -EBADMSG;
if (*offset >= buflen - offsetof(DHCP6Option, data))
return -EBADMSG;
option = (const DHCP6Option*) (buf + *offset);
len = be16toh(option->len);
if (len > *buflen)
return -ENOMSG;
if (len > buflen - offsetof(DHCP6Option, data) - *offset)
return -EBADMSG;
*optcode = be16toh(option->code);
*optlen = len;
*buf += 4;
*buflen -= 4;
return 0;
}
int dhcp6_option_parse(uint8_t **buf, size_t *buflen, uint16_t *optcode,
size_t *optlen, uint8_t **optvalue) {
int r;
assert_return(buf && buflen && optcode && optlen && optvalue, -EINVAL);
r = option_parse_hdr(buf, buflen, optcode, optlen);
if (r < 0)
return r;
if (*optlen > *buflen)
return -ENOBUFS;
*optvalue = *buf;
*buflen -= *optlen;
*buf += *optlen;
*offset += offsetof(DHCP6Option, data) + len;
*ret_option_code = be16toh(option->code);
*ret_option_data_len = len;
*ret_option_data = option->data;
return 0;
}

37
src/libsystemd-network/sd-dhcp6-lease.c
View File

@ -259,9 +259,6 @@ int sd_dhcp6_lease_get_domains(sd_dhcp6_lease *lease, char ***domains) {
int dhcp6_lease_set_ntp(sd_dhcp6_lease *lease, uint8_t *optval, size_t optlen) {
int r;
uint16_t subopt;
size_t sublen;
uint8_t *subval;
assert_return(lease, -EINVAL);
assert_return(optval, -EINVAL);
@ -269,10 +266,14 @@ int dhcp6_lease_set_ntp(sd_dhcp6_lease *lease, uint8_t *optval, size_t optlen) {
lease->ntp = mfree(lease->ntp);
lease->ntp_count = 0;
while ((r = dhcp6_option_parse(&optval, &optlen, &subopt, &sublen,
&subval)) >= 0) {
int s;
char **servers;
for (size_t offset = 0; offset < optlen;) {
const uint8_t *subval;
size_t sublen;
uint16_t subopt;
r = dhcp6_option_parse(optval, optlen, &offset, &subopt, &sublen, &subval);
if (r < 0)
return r;
switch(subopt) {
case DHCP6_NTP_SUBOPTION_SRV_ADDR:
@ -280,19 +281,18 @@ int dhcp6_lease_set_ntp(sd_dhcp6_lease *lease, uint8_t *optval, size_t optlen) {
if (sublen != 16)
return 0;
s = dhcp6_option_parse_ip6addrs(subval, sublen,
&lease->ntp,
lease->ntp_count);
if (s < 0)
return s;
r = dhcp6_option_parse_ip6addrs(subval, sublen, &lease->ntp, lease->ntp_count);
if (r < 0)
return r;
lease->ntp_count = s;
lease->ntp_count = r;
break;
case DHCP6_NTP_SUBOPTION_SRV_FQDN:
r = dhcp6_option_parse_domainname_list(subval, sublen,
&servers);
case DHCP6_NTP_SUBOPTION_SRV_FQDN: {
char **servers;
r = dhcp6_option_parse_domainname_list(subval, sublen, &servers);
if (r < 0)
return 0;
@ -300,11 +300,8 @@ int dhcp6_lease_set_ntp(sd_dhcp6_lease *lease, uint8_t *optval, size_t optlen) {
lease->ntp_fqdn_count = r;
break;
}}
}
}
if (r != -ENOMSG)
return r;
return 0;
}

50
src/libsystemd-network/test-dhcp6-client.c
View File

@ -170,47 +170,47 @@ static int test_option(sd_event *e) {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
'B', 'A', 'R',
};
size_t offset, pos, optlen, outlen = sizeof(result);
const uint8_t *optval;
uint16_t optcode;
size_t optlen;
uint8_t *optval, *buf, *out;
size_t zero = 0, pos = 3;
size_t buflen = sizeof(packet), outlen = sizeof(result);
uint8_t *out;
log_debug("/* %s */", __func__);
assert_se(buflen == outlen);
assert_se(sizeof(packet) == sizeof(result));
assert_se(dhcp6_option_parse(&buf, &zero, &optcode, &optlen,
&optval) == -ENOMSG);
offset = 0;
assert_se(dhcp6_option_parse(packet, 0, &offset, &optcode, &optlen, &optval) == -EBADMSG);
buflen -= 3;
buf = &packet[3];
offset = 3;
assert_se(dhcp6_option_parse(packet, 0, &offset, &optcode, &optlen, &optval) == -EBADMSG);
offset = 3;
assert_se(dhcp6_option_parse(packet, sizeof(packet), &offset, &optcode, &optlen, &optval) >= 0);
assert_se(optcode == SD_DHCP6_OPTION_ORO);
assert_se(optlen == 7);
assert_se(optval == packet + 7);
pos = 3;
outlen -= 3;
out = &result[3];
assert_se(dhcp6_option_parse(&buf, &buflen, &optcode, &optlen,
&optval) >= 0);
pos += 4 + optlen;
assert_se(buf == &packet[pos]);
assert_se(optcode == SD_DHCP6_OPTION_ORO);
assert_se(optlen == 7);
assert_se(buflen + pos == sizeof(packet));
assert_se(dhcp6_option_append(&out, &outlen, optcode, optlen, optval) >= 0);
assert_se(dhcp6_option_append(&out, &outlen, optcode, optlen,
optval) >= 0);
pos += 4 + optlen;
assert_se(out == &result[pos]);
assert_se(*out == 0x00);
assert_se(dhcp6_option_parse(&buf, &buflen, &optcode, &optlen,
&optval) >= 0);
pos += 4 + optlen;
assert_se(buf == &packet[pos]);
assert_se(dhcp6_option_parse(packet, sizeof(packet), &offset, &optcode, &optlen, &optval) >= 0);
assert_se(optcode == SD_DHCP6_OPTION_VENDOR_CLASS);
assert_se(optlen == 9);
assert_se(buflen + pos == sizeof(packet));
assert_se(optval == packet + 18);
assert_se(dhcp6_option_append(&out, &outlen, optcode, optlen,
optval) >= 0);
assert_se(dhcp6_option_append(&out, &outlen, optcode, optlen, optval) >= 0);
pos += 4 + optlen;
assert_se(out == &result[pos]);
assert_se(*out == 'B');