1 /* dnsmasq is Copyright (c) 2000-2009 Simon Kelley
59     if (pipe(pipefd) == -1 || !fix_fd(pipefd[1]) || (pid = fork()) == -1) {  in create_helper()
77     if (!(daemon->options & OPT_DEBUG) && uid != 0) {  in create_helper()
79         if (setgroups(0, &unused) == -1 || setgid(gid) == -1 || setuid(uid) == -1) {  in create_helper()
80             if (daemon->options & OPT_NO_FORK) /* send error to daemon process if no-fork */  in create_helper()
83                 /* kill daemon */  in create_helper()
94     for (max_fd--; max_fd >= 0; max_fd--)  in create_helper()
103         unsigned char* buf = (unsigned char*) daemon->namebuff;  in create_helper()
119         p = daemon->dhcp_buff;  in create_helper()
121             p += sprintf(p, "%.2x-", data.hwaddr_type);  in create_helper()
124             if (i != data.hwaddr_len - 1) p += sprintf(p, ":");  in create_helper()
129         for (p = daemon->packet, i = 0; i < data.clid_len; i++) {  in create_helper()
131             if (i != data.clid_len - 1) p += sprintf(p, ":");  in create_helper()
136         sprintf(daemon->dhcp_buff2, "%u ", data.length);  in create_helper()
138         sprintf(daemon->dhcp_buff2, "%lu ", (unsigned long) data.expires);  in create_helper()
146         while ((pid = fork()) == -1 && (errno == EAGAIN || errno == ENOMEM)) sleep(2);  in create_helper()
148         if (pid == -1) continue;  in create_helper()
166                 if (rc == -1 && errno != EINTR) break;  in create_helper()
172         if (data.clid_len != 0) my_setenv("DNSMASQ_CLIENT_ID", daemon->packet, &err);  in create_helper()
177         my_setenv("DNSMASQ_LEASE_LENGTH", daemon->dhcp_buff2, &err);  in create_helper()
179         my_setenv("DNSMASQ_LEASE_EXPIRES", daemon->dhcp_buff2, &err);  in create_helper()
183             buf[data.vclass_len - 1] = 0; /* don't trust zero-term */  in create_helper()
184             /* cannot have = chars in env - truncate if found . */  in create_helper()
192             buf[data.uclass_len - 1] = 0; /* don't trust zero-term */  in create_helper()
198                     sprintf(daemon->dhcp_buff2, "DNSMASQ_USER_CLASS%i", i++);  in create_helper()
199                     my_setenv(daemon->dhcp_buff2, (char*) buf, &err);  in create_helper()
206             buf[data.shost_len - 1] = 0; /* don't trust zero-term */  in create_helper()
207             /* cannot have = chars in env - truncate if found . */  in create_helper()
216         sprintf(daemon->dhcp_buff2, "%u ", data.remaining_time);  in create_helper()
217         my_setenv("DNSMASQ_TIME_REMAINING", daemon->dhcp_buff2, &err);  in create_helper()
222             hostname[data.hostname_len - 1] = 0;  in create_helper()
237         if ((i = fcntl(event_fd, F_GETFD)) != -1) fcntl(event_fd, F_SETFD, i | FD_CLOEXEC);  in create_helper()
240         p = strrchr(daemon->lease_change_command, '/');  in create_helper()
242             execl(daemon->lease_change_command, p ? p + 1 : daemon->lease_change_command,  in create_helper()
243                   action_str, daemon->dhcp_buff, inet_ntoa(data.addr), hostname, (char*) NULL);  in create_helper()
264     if (daemon->helperfd == -1) return;  in queue_script()
266     if (lease->vendorclass) vclass_len = lease->vendorclass_len;  in queue_script()
267     if (lease->userclass) uclass_len = lease->userclass_len;  in queue_script()
268     if (lease->supplied_hostname) shost_len = lease->supplied_hostname_len;  in queue_script()
269     if (lease->clid) clid_len = lease->clid_len;  in queue_script()
287     buf->action = action;  in queue_script()
288     buf->hwaddr_len = lease->hwaddr_len;  in queue_script()
289     buf->hwaddr_type = lease->hwaddr_type;  in queue_script()
290     buf->clid_len = clid_len;  in queue_script()
291     buf->vclass_len = vclass_len;  in queue_script()
292     buf->uclass_len = uclass_len;  in queue_script()
293     buf->shost_len = shost_len;  in queue_script()
294     buf->hostname_len = hostname_len;  in queue_script()
295     buf->addr = lease->addr;  in queue_script()
296     buf->giaddr = lease->giaddr;  in queue_script()
297     memcpy(buf->hwaddr, lease->hwaddr, lease->hwaddr_len);  in queue_script()
298     buf->interface[0] = 0;  in queue_script()
300     if (lease->last_interface != 0) {  in queue_script()
302         ifr.ifr_ifindex = lease->last_interface;  in queue_script()
303         if (ioctl(daemon->dhcpfd, SIOCGIFNAME, &ifr) != -1)  in queue_script()
304             strncpy(buf->interface, ifr.ifr_name, IF_NAMESIZE);  in queue_script()
307     if (lease->last_interface != 0) if_indextoname(lease->last_interface, buf->interface);  in queue_script()
311     buf->length = lease->length;  in queue_script()
313     buf->expires = lease->expires;  in queue_script()
315     buf->remaining_time = (unsigned int) difftime(lease->expires, now);  in queue_script()
319         memcpy(p, lease->clid, clid_len);  in queue_script()
323         memcpy(p, lease->vendorclass, vclass_len);  in queue_script()
327         memcpy(p, lease->userclass, uclass_len);  in queue_script()
331         memcpy(p, lease->supplied_hostname, shost_len);  in queue_script()
339     bytes_in_buf = p - (unsigned char*) buf;  in queue_script()
351     if ((rc = write(daemon->helperfd, buf, bytes_in_buf)) != -1) {  in helper_write()
352         if (bytes_in_buf != (size_t) rc) memmove(buf, buf + rc, bytes_in_buf - rc);  in helper_write()
353         bytes_in_buf -= rc;  in helper_write()