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authorDimitri Staessens <dimitri.staessens@intec.ugent.be>2016-04-27 22:46:42 +0200
committerDimitri Staessens <dimitri.staessens@intec.ugent.be>2016-04-27 22:46:42 +0200
commitde8f2015cbd015b1cced366cb12c054be62c23b1 (patch)
treea9d675152417928ebfae8c034a43d0f81e750dd4 /src/ipcpd/shim-udp/main.c
parentd697babdbe0671b5d9a4cf4e0e46234f5045faef (diff)
parentc01a4c47d2ac21f54ad86a618eec30921f2bc73d (diff)
downloadouroboros-de8f2015cbd015b1cced366cb12c054be62c23b1.tar.gz
ouroboros-de8f2015cbd015b1cced366cb12c054be62c23b1.zip
Merged in sandervrijders/ouroboros/be (pull request #64)
ipcpd: Add registration to DNS server
Diffstat (limited to 'src/ipcpd/shim-udp/main.c')
-rw-r--r--src/ipcpd/shim-udp/main.c103
1 files changed, 97 insertions, 6 deletions
diff --git a/src/ipcpd/shim-udp/main.c b/src/ipcpd/shim-udp/main.c
index 71c414ef..460fe9e3 100644
--- a/src/ipcpd/shim-udp/main.c
+++ b/src/ipcpd/shim-udp/main.c
@@ -44,11 +44,13 @@
#include <signal.h>
#include <stdlib.h>
#include <pthread.h>
+#include <sys/wait.h>
#define THIS_TYPE IPCP_SHIM_UDP
#define LISTEN_PORT htons(0x0D1F)
#define SHIM_UDP_BUF_SIZE 256
#define SHIM_UDP_MAX_SDU_SIZE 8980
+#define DNS_TTL 86400
#define shim_data(type) ((struct ipcp_udp_data *) type->data)
@@ -340,35 +342,124 @@ int ipcp_udp_bootstrap(struct dif_config * conf)
return 0;
}
+/* FIXME: Dependency on nsupdate to be removed in the end */
+static int ddns_send(char * cmd)
+{
+ pid_t pid = 0;
+ int wstatus;
+ int pipe_fd[2];
+ char * argv[] = {NSUPDATE_EXEC, 0};
+ char * envp[] = {0};
+
+ if (pipe(pipe_fd)) {
+ LOG_ERR("Failed to create pipe.");
+ return -1;
+ }
+
+ pid = fork();
+ if (pid == -1) {
+ LOG_ERR("Failed to fork.");
+ return -1;
+ }
+
+ if (pid == 0) {
+ close(pipe_fd[1]);
+ dup2(pipe_fd[0], 0);
+ execve(argv[0], &argv[0], envp);
+ }
+
+ close(pipe_fd[0]);
+
+ if (write(pipe_fd[1], cmd, strlen(cmd)) == -1) {
+ LOG_ERR("Failed to register with DNS server.");
+ close(pipe_fd[1]);
+ return -1;
+ }
+
+ waitpid(pid, &wstatus, 0);
+ if (WIFEXITED(wstatus) == true &&
+ WEXITSTATUS(wstatus) == 0)
+ LOG_DBGF("Succesfully communicated with DNS server.");
+ else
+ LOG_ERR("Failed to register with DNS server.");
+
+ close(pipe_fd[1]);
+ return 0;
+}
+
int ipcp_udp_name_reg(char * name)
{
+ char ipstr[INET_ADDRSTRLEN];
+ char dnsstr[INET_ADDRSTRLEN];
+ /* max DNS name length + max IP length + command length */
+ char cmd[100];
+ uint32_t dns_addr;
+ uint32_t ip_addr;
+
if (_ipcp->state != IPCP_ENROLLED) {
LOG_DBGF("Won't register with non-enrolled IPCP.");
return -1;
}
+ if (strlen(name) > 24) {
+ LOG_ERR("DNS names cannot be longer than 24 chars.");
+ return -1;
+ }
+
if (ipcp_data_add_reg_entry(_ipcp->data, name)) {
LOG_ERR("Failed to add %s to local registry.", name);
return -1;
}
- LOG_DBG("Registered %s", name);
+ /* register application with DNS server */
+
+ dns_addr = shim_data(_ipcp)->dns_addr;
+ if (dns_addr != 0) {
+ ip_addr = shim_data(_ipcp)->ip_addr;
- /* FIXME: register application with DNS server */
- LOG_MISSING;
+ inet_ntop(AF_INET, &ip_addr, ipstr, INET_ADDRSTRLEN);
+ inet_ntop(AF_INET, &dns_addr, dnsstr, INET_ADDRSTRLEN);
+ sprintf(cmd, "server %s\nupdate add %s %d A %s\nsend\nquit\n",
+ dnsstr, name, DNS_TTL, ipstr);
+
+ if (ddns_send(cmd)) {
+ ipcp_data_del_reg_entry(_ipcp->data, name);
+ return -1;
+ }
+ }
+
+ LOG_DBG("Registered %s.", name);
return 0;
}
int ipcp_udp_name_unreg(char * name)
{
+ char dnsstr[INET_ADDRSTRLEN];
+ /* max DNS name length + max IP length + max command length */
+ char cmd[100];
+ uint32_t dns_addr;
+
+ if (strlen(name) > 24) {
+ LOG_ERR("DNS names cannot be longer than 24 chars.");
+ return -1;
+ }
+
+ /* unregister application with DNS server */
+
+ dns_addr = shim_data(_ipcp)->dns_addr;
+ if (dns_addr != 0) {
+ inet_ntop(AF_INET, &dns_addr, dnsstr, INET_ADDRSTRLEN);
+ sprintf(cmd, "server %s\nupdate delete %s A\nsend\nquit\n",
+ dnsstr, name);
+
+ ddns_send(cmd);
+ }
+
ipcp_data_del_reg_entry(_ipcp->data, name);
LOG_DBG("Unregistered %s.", name);
- /* FIXME: unregister application from DNS server */
- LOG_MISSING;
-
return 0;
}