static
int route_adddel(struct main_server_st* s, proc_st *proc,
const char* pattern, const char* route, const char* dev)
{
int ret;
char *cmd = NULL;
if (pattern == 0) {
mslog(s, NULL, LOG_WARNING, "route-add-cmd or route-del-cmd are not set.");
return 0;
}
ret = replace_cmd(s, proc, &cmd, pattern, route, dev);
if (ret < 0)
return ret;
ret = call_script(s, proc, cmd);
if (ret < 0) {
int e = errno;
mslog(s, NULL, LOG_INFO, "failed to spawn cmd: %s: %s", cmd, strerror(e));
ret = ERR_EXEC;
goto fail;
}
ret = 0;
fail:
talloc_free(cmd);
return ret;
}
int get_ip_leases(main_server_st* s, struct proc_st* proc)
{
int ret;
char buf[128];
if (proc->ipv4 == NULL) {
ret = get_ipv4_lease(s, proc);
if (ret < 0)
return ret;
if (proc->ipv4) {
if (htable_add(&s->ip_leases.ht, rehash(proc->ipv4, NULL), proc->ipv4) == 0) {
mslog(s, proc, LOG_ERR, "could not add IPv4 lease to hash table.");
return -1;
}
}
}
if (proc->ipv6 == NULL) {
ret = get_ipv6_lease(s, proc);
if (ret < 0)
return ret;
if (proc->ipv6) {
if (htable_add(&s->ip_leases.ht, rehash(proc->ipv6, NULL), proc->ipv6) == 0) {
mslog(s, proc, LOG_ERR, "could not add IPv6 lease to hash table.");
return -1;
}
}
}
if (proc->ipv4 == 0 && proc->ipv6 == 0) {
mslog(s, proc, LOG_ERR, "no IPv4 or IPv6 addresses are configured. Cannot obtain lease.");
return -1;
}
if (proc->ipv4)
mslog(s, proc, LOG_INFO, "assigned IPv4 to '%s': %s", proc->username,
human_addr((void*)&proc->ipv4->rip, proc->ipv4->rip_len, buf, sizeof(buf)));
if (proc->ipv6)
mslog(s, proc, LOG_INFO, "assigned IPv6 to '%s': %s", proc->username,
human_addr((void*)&proc->ipv6->rip, proc->ipv6->rip_len, buf, sizeof(buf)));
return 0;
}
int handle_resume_store_req(main_server_st * s, struct proc_st *proc,
const SessionResumeStoreReqMsg * req)
{
tls_cache_st *cache;
size_t key;
unsigned int max;
if (req->session_id.len > GNUTLS_MAX_SESSION_ID)
return -1;
if (req->session_data.len > MAX_SESSION_DATA_SIZE)
return -1;
max = MAX(2 * s->config->max_clients, DEFAULT_MAX_CACHED_TLS_SESSIONS);
if (s->tls_db.entries >= max) {
mslog(s, NULL, LOG_INFO,
"maximum number of stored TLS sessions reached (%u)",
max);
need_maintenance = 1;
return -1;
}
key = hash_any(req->session_id.data, req->session_id.len, 0);
cache = talloc(s->tls_db.ht, tls_cache_st);
if (cache == NULL)
return -1;
cache->session_id_size = req->session_id.len;
cache->session_data_size = req->session_data.len;
cache->remote_addr_len = proc->remote_addr_len;
memcpy(cache->session_id, req->session_id.data, req->session_id.len);
memcpy(cache->session_data, req->session_data.data,
req->session_data.len);
memcpy(&cache->remote_addr, &proc->remote_addr, proc->remote_addr_len);
htable_add(s->tls_db.ht, key, cache);
s->tls_db.entries++;
mslog_hex(s, proc, LOG_DEBUG, "TLS session DB storing",
req->session_id.data,
req->session_id.len, 0);
return 0;
}
static
int call_script(main_server_st *s, proc_st *proc, const char *cmd)
{
pid_t pid;
int ret, status = 0;
if (cmd == NULL)
return 0;
pid = fork();
if (pid == 0) {
sigprocmask(SIG_SETMASK, &sig_default_set, NULL);
mslog(s, proc, LOG_DEBUG, "executing route script %s", cmd);
ret = execl("/bin/sh", "sh", "-c", cmd, NULL);
if (ret == -1) {
mslog(s, proc, LOG_ERR, "Could not execute route script %s", cmd);
exit(1);
}
exit(77);
} else if (pid == -1) {
mslog(s, proc, LOG_ERR, "Could not fork()");
return ERR_EXEC;
}
ret = waitpid(pid, &status, 0);
if (ret == -1) {
mslog(s, proc, LOG_ERR, "Could not waitpid()");
return ERR_EXEC;
}
if (!WIFEXITED(status)) {
mslog(s, proc, LOG_INFO, "cmd: %s: exited abnormally", cmd);
return ERR_EXEC;
}
if (WEXITSTATUS(status)) {
mslog(s, proc, LOG_INFO, "cmd: %s: exited with error %d", cmd, WEXITSTATUS(ret));
return ERR_EXEC;
}
return 0;
}
static
int call_script(main_server_st *s, struct proc_st* proc, unsigned up)
{
pid_t pid;
int ret;
const char* script;
if (up != 0)
script = s->config->connect_script;
else
script = s->config->disconnect_script;
if (script == NULL)
return 0;
pid = fork();
if (pid == 0) {
char real[64];
char local[64];
char remote[64];
if (proc->ipv4 == NULL && proc->ipv6 == NULL)
exit(1);
if (getnameinfo((void*)&proc->remote_addr, proc->remote_addr_len, real, sizeof(real), NULL, 0, NI_NUMERICHOST) != 0)
exit(1);
if (proc->ipv4 && proc->ipv4->lip_len > 0) {
if (getnameinfo((void*)&proc->ipv4->lip, proc->ipv4->lip_len, local, sizeof(local), NULL, 0, NI_NUMERICHOST) != 0)
exit(1);
} else {
if (getnameinfo((void*)&proc->ipv6->lip, proc->ipv6->lip_len, local, sizeof(local), NULL, 0, NI_NUMERICHOST) != 0)
exit(1);
}
if (proc->ipv4 && proc->ipv4->rip_len > 0) {
if (getnameinfo((void*)&proc->ipv4->rip, proc->ipv4->rip_len, remote, sizeof(remote), NULL, 0, NI_NUMERICHOST) != 0)
exit(1);
} else {
if (getnameinfo((void*)&proc->ipv6->rip, proc->ipv6->rip_len, remote, sizeof(remote), NULL, 0, NI_NUMERICHOST) != 0)
exit(1);
}
setenv("USERNAME", proc->username, 1);
setenv("GROUPNAME", proc->groupname, 1);
setenv("HOSTNAME", proc->hostname, 1);
setenv("DEVICE", proc->tun_lease.name, 1);
setenv("IP_REAL", real, 1);
setenv("IP_LOCAL", local, 1);
setenv("IP_REMOTE", remote, 1);
if (up)
setenv("REASON", "connect", 1);
else
setenv("REASON", "disconnect", 1);
mslog(s, proc, LOG_DEBUG, "executing script %s", script);
ret = execl(script, script, NULL);
if (ret == -1) {
mslog(s, proc, LOG_ERR, "Could not execute script %s", script);
exit(1);
}
exit(77);
} else if (pid == -1) {
mslog(s, proc, LOG_ERR, "Could not fork()");
return -1;
}
if (up) {
add_to_script_list(s, pid, up, proc);
return ERR_WAIT_FOR_SCRIPT;
} else {
return 0;
}
}
static
int get_ipv6_lease(main_server_st* s, struct proc_st* proc)
{
struct sockaddr_storage tmp, mask, network, rnd;
unsigned i, max_loops = MAX_IP_TRIES;
int ret;
const char* c_network, *c_netmask;
char buf[64];
if (proc->config.ipv6_network && proc->config.ipv6_netmask) {
c_network = proc->config.ipv6_network;
c_netmask = proc->config.ipv6_netmask;
} else {
c_network = s->config->network.ipv6;
c_netmask = s->config->network.ipv6_netmask;
}
if (c_network && c_netmask) {
ret =
inet_pton(AF_INET6, c_network, SA_IN6_P(&network));
if (ret != 1) {
mslog(s, NULL, LOG_ERR, "error reading IP: %s", c_network);
return -1;
}
ret =
inet_pton(AF_INET6, c_netmask, SA_IN6_P(&mask));
if (ret != 1) {
mslog(s, NULL, LOG_ERR, "error reading mask: %s", c_netmask);
return -1;
}
proc->ipv6 = calloc(1, sizeof(*proc->ipv6));
if (proc->ipv6 == NULL)
return ERR_MEM;
/* mask the network */
for (i=0;i<sizeof(struct in6_addr);i++)
SA_IN6_U8_P(&network)[i] &= (SA_IN6_U8_P(&mask)[i]);
((struct sockaddr_in6*)&network)->sin6_family = AF_INET6;
((struct sockaddr_in6*)&network)->sin6_port = 0;
memcpy(&tmp, &network, sizeof(tmp));
((struct sockaddr_in6*)&tmp)->sin6_family = AF_INET6;
((struct sockaddr_in6*)&tmp)->sin6_port = AF_INET6;
((struct sockaddr_in6*)&rnd)->sin6_family = AF_INET6;
((struct sockaddr_in6*)&rnd)->sin6_port = AF_INET6;
do {
if (max_loops == 0) {
mslog(s, NULL, LOG_ERR, "could not figure out a valid IPv6 IP.");
ret = ERR_NO_IP;
goto fail;
}
if (max_loops == MAX_IP_TRIES) {
uint32_t t = hash_any(proc->username, strlen(proc->username), 0);
memset(SA_IN6_U8_P(&rnd), 0, sizeof(struct in6_addr));
memcpy(SA_IN6_U8_P(&rnd)+sizeof(struct in6_addr)-5, &t, 4);
} else
gnutls_rnd(GNUTLS_RND_NONCE, SA_IN6_U8_P(&rnd), sizeof(struct in6_addr));
max_loops--;
/* Mask the random number with the netmask */
for (i=0;i<sizeof(struct in6_addr);i++)
SA_IN6_U8_P(&rnd)[i] &= ~(SA_IN6_U8_P(&mask)[i]);
SA_IN6_U8_P(&rnd)[sizeof(struct in6_addr)-1] &= 0xFE;
/* Now add the network to the masked random number */
for (i=0;i<sizeof(struct in6_addr);i++)
SA_IN6_U8_P(&rnd)[i] |= (SA_IN6_U8_P(&network)[i]);
/* check if it exists in the hash table */
if (ip_lease_exists(s, &rnd, sizeof(struct sockaddr_in6)) != 0) {
mslog(s, proc, LOG_DEBUG, "cannot assign local IP %s to '%s'; it is in use.",
human_addr((void*)&rnd, sizeof(struct sockaddr_in6), buf, sizeof(buf)),
proc->username);
continue;
}
proc->ipv6->lip_len = sizeof(struct sockaddr_in6);
memcpy(&proc->ipv6->lip, &rnd, proc->ipv6->lip_len);
/* RIP = LIP + 1 */
memcpy(&tmp, &proc->ipv6->lip, proc->ipv6->rip_len);
bignum_add(SA_IN6_U8_P(&tmp), sizeof(struct in6_addr), 1);
/* check if it exists in the hash table */
if (ip_lease_exists(s, &tmp, sizeof(struct sockaddr_in6)) != 0) {
mslog(s, proc, LOG_DEBUG, "cannot assign remote IP %s to '%s'; it is in use.",
human_addr((void*)&tmp, sizeof(struct sockaddr_in6), buf, sizeof(buf)),
proc->username);
continue;
}
proc->ipv6->rip_len = sizeof(struct sockaddr_in6);
memcpy(&proc->ipv6->rip, &tmp, proc->ipv6->rip_len);
/* mask the last IP with the netmask */
for (i=0;i<sizeof(struct in6_addr);i++)
SA_IN6_U8_P(&tmp)[i] &= (SA_IN6_U8_P(&mask)[i]);
/* the result should match the network */
if (memcmp(SA_IN6_U8_P(&network), SA_IN6_U8_P(&tmp), sizeof(struct in6_addr)) != 0) {
continue;
}
mslog(s, proc, LOG_DEBUG, "selected IP for '%s': %s", proc->username,
human_addr((void*)&proc->ipv6->lip, proc->ipv6->lip_len, buf, sizeof(buf)));
if (icmp_ping6(s, (void*)&proc->ipv6->lip, (void*)&proc->ipv6->rip) == 0)
break;
} while(1);
}
return 0;
fail:
free(proc->ipv6);
proc->ipv6 = NULL;
return ret;
}
static
int get_ipv4_lease(main_server_st* s, struct proc_st* proc)
{
struct sockaddr_storage tmp, mask, network, rnd;
unsigned i;
unsigned max_loops = MAX_IP_TRIES;
int ret;
const char* c_network, *c_netmask;
char buf[64];
/* Our IP accounting */
if (proc->config.ipv4_network && proc->config.ipv4_netmask) {
c_network = proc->config.ipv4_network;
c_netmask = proc->config.ipv4_netmask;
} else {
c_network = s->config->network.ipv4;
c_netmask = s->config->network.ipv4_netmask;
}
if (c_network == NULL || c_netmask == NULL) {
mslog(s, NULL, LOG_DEBUG, "there is no IPv4 network assigned");
return 0;
}
ret =
inet_pton(AF_INET, c_network, SA_IN_P(&network));
if (ret != 1) {
mslog(s, NULL, LOG_ERR, "error reading IP: %s", c_network);
return -1;
}
ret =
inet_pton(AF_INET, c_netmask, SA_IN_P(&mask));
if (ret != 1) {
mslog(s, NULL, LOG_ERR, "error reading mask: %s", c_netmask);
return -1;
}
/* mask the network (just in case it is wrong) */
for (i=0;i<sizeof(struct in_addr);i++)
SA_IN_U8_P(&network)[i] &= (SA_IN_U8_P(&mask)[i]);
((struct sockaddr_in*)&network)->sin_family = AF_INET;
((struct sockaddr_in*)&network)->sin_port = 0;
if (proc->config.explicit_ipv4) {
/* if an explicit IP is given for that client, then
* do implicit IP accounting. Require the address
* to be odd, so we use the next even address as PtP. */
ret =
inet_pton(AF_INET, proc->config.explicit_ipv4, SA_IN_P(&tmp));
if (ret != 1) {
mslog(s, NULL, LOG_ERR, "error reading explicit IP: %s", proc->config.explicit_ipv4);
return -1;
}
proc->ipv4 = talloc_zero(proc, struct ip_lease_st);
if (proc->ipv4 == NULL)
return ERR_MEM;
((struct sockaddr_in*)&tmp)->sin_family = AF_INET;
((struct sockaddr_in*)&tmp)->sin_port = 0;
memcpy(&proc->ipv4->rip, &tmp, sizeof(struct sockaddr_in));
proc->ipv4->rip_len = sizeof(struct sockaddr_in);
if (is_ipv4_ok(s, &proc->ipv4->rip, &network, &mask) == 0) {
mslog(s, proc, LOG_DEBUG, "cannot assign explicit IP %s; it is in use or invalid",
human_addr((void*)&tmp, sizeof(struct sockaddr_in), buf, sizeof(buf)));
ret = ERR_NO_IP;
goto fail;
}
/* LIP = network address + 1 */
memcpy(&proc->ipv4->lip, &network, sizeof(struct sockaddr_in));
proc->ipv4->lip_len = sizeof(struct sockaddr_in);
SA_IN_U8_P(&proc->ipv4->lip)[3] |= 1;
if (ip_cmp(&proc->ipv4->lip, &proc->ipv4->rip) == 0) {
mslog(s, NULL, LOG_ERR, "cannot assign explicit IP %s; network: %s", proc->config.explicit_ipv4, c_network);
ret = ERR_NO_IP;
goto fail;
}
return 0;
}
