X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=Usermode%2FApplications%2Fdhcpclient_src%2Fmain.c;h=d6f4cda0565ecaa2a1cbe04f30282162024bb990;hb=545c440973f9676efe7cb01edf9ec47b61023513;hp=5b122d8d0369853fa018b6e2e2496ad8f2dbaa85;hpb=52fad670ab81459de0ff1bd0fa99a3396a6999e3;p=tpg%2Facess2.git diff --git a/Usermode/Applications/dhcpclient_src/main.c b/Usermode/Applications/dhcpclient_src/main.c index 5b122d8d..d6f4cda0 100644 --- a/Usermode/Applications/dhcpclient_src/main.c +++ b/Usermode/Applications/dhcpclient_src/main.c @@ -2,13 +2,20 @@ * * http://www.ietf.org/rfc/rfc2131.txt */ -#include #include #include #include #include #include #include +#include + +enum { + UDP_IOCTL_GETSETLPORT = 4, + UDP_IOCTL_GETSETRPORT, + UDP_IOCTL_GETSETRMASK, + UDP_IOCTL_SETRADDR, +}; #define FILENAME_MAX 255 // --- Translation functions --- @@ -34,7 +41,7 @@ enum eStates STATE_PREINIT, STATE_DISCOVER_SENT, STATE_REQUEST_SENT, - STATE_COMPLETE + STATE_COMPLETE, }; // === STRUCTURES === @@ -70,8 +77,10 @@ typedef struct sInterface uint32_t TransactionID; char HWAddr[6]; - + + int64_t StartTime; int64_t Timeout; + int nTimeouts; } tInterface; // === PROTOTYPES === @@ -80,17 +89,16 @@ void Scan_Dir(tInterface **IfaceList, const char *Directory); int Start_Interface(tInterface *Iface); void Send_DHCPDISCOVER(tInterface *Iface); void Send_DHCPREQUEST(tInterface *Iface, void *OfferBuffer, int TypeOffset); -int Handle_Packet(tInterface *Iface); -void Handle_Timeout(tInterface *Iface); + int Handle_Packet(tInterface *Iface); + int Handle_Timeout(tInterface *Iface); void Update_State(tInterface *Iface, int newState); void SetAddress(tInterface *Iface, void *Addr, void *Mask, void *Router); // === CODE === int main(int argc, char *argv[]) { - tInterface *ifaces = NULL, *i; + tInterface *ifaces = NULL; - // TODO: Scan /Devices and search for network adapters if( argc > 2 ) { fprintf(stderr, "Usage: %s \n", argv[0]); return -1; @@ -105,12 +113,13 @@ int main(int argc, char *argv[]) Scan_Dir( &ifaces, "/Devices/ip/adapters" ); } - for( i = ifaces; i; i = i->Next ) + for( tInterface *i = ifaces; i; i = i->Next ) { if( Start_Interface(i) < 0 ) { return -1; } i->State = STATE_PREINIT; + i->StartTime = _SysTimestamp(); // Send request Send_DHCPDISCOVER(i); @@ -120,44 +129,48 @@ int main(int argc, char *argv[]) { int maxfd; fd_set fds; - tInterface *p; int64_t timeout = 1000; maxfd = 0; FD_ZERO(&fds); - for( i = ifaces; i; i = i->Next ) + for( tInterface *i = ifaces; i; i = i->Next ) { FD_SET(i->SocketFD, &fds); if(maxfd < i->SocketFD) maxfd = i->SocketFD; } - if( select(maxfd+1, &fds, NULL, NULL, &timeout) < 0 ) + if( _SysSelect(maxfd+1, &fds, NULL, NULL, &timeout, 0) < 0 ) { - // TODO: Check error result + perror("_SysSelect returned error"); return -1; } _SysDebug("select() returned"); // Check for changes (with magic to allow inline deletion) - for( p = (void*)&ifaces, i = ifaces; i; p=i,i = i->Next ) + for( tInterface *p = (void*)&ifaces, *i = ifaces; i; p=i,i = i->Next ) { if( FD_ISSET(i->SocketFD, &fds) ) { if( Handle_Packet( i ) ) - { - _SysClose(i->SocketFD); - _SysClose(i->IfaceFD); - p->Next = i->Next; - free(i); - i = p; - } + goto _remove; } if( _SysTimestamp() > i->Timeout ) { - Handle_Timeout(i); + if( Handle_Timeout(i) ) + { + fprintf(stderr, "DHCP on %s timed out\n", i->Adapter); + goto _remove; + } } + continue ; + _remove: + _SysClose(i->SocketFD); + _SysClose(i->IfaceFD); + p->Next = i->Next; + free(i); + i = p; } } return 0; @@ -202,11 +215,14 @@ int Start_Interface(tInterface *Iface) sprintf(path, "/Devices/ip/adapters/%s", Iface->Adapter); fd = _SysOpen(path, 0); if(fd == -1) { + perror("Opening adapter"); _SysDebug("Unable to open adapter %s", path); return -1; } - _SysIOCtl(fd, 4, Iface->HWAddr); - // TODO: Check if ioctl() failed + if( _SysIOCtl(fd, 4, Iface->HWAddr) ) { + perror("Getting MAC address"); + return -1; + } _SysClose(fd); } @@ -216,7 +232,15 @@ int Start_Interface(tInterface *Iface) fprintf(stderr, "ERROR: Unable to open '/Devices/ip'\n"); return -1; } - Iface->Num = _SysIOCtl(fd, 4, (void*)Iface->Adapter); // Create interface + struct { + const char *Device; + const char *Name; + int Type; + } ifinfo; + ifinfo.Device = Iface->Adapter; + ifinfo.Name = ""; + ifinfo.Type = 4; + Iface->Num = _SysIOCtl(fd, 4, &ifinfo); // Create interface if( Iface->Num == -1 ) { fprintf(stderr, "ERROR: Unable to create new interface\n"); return -1; @@ -230,22 +254,21 @@ int Start_Interface(tInterface *Iface) fprintf(stderr, "ERROR: Unable to open '%s'\n", path); return -1; } - tmp = 4; _SysIOCtl(fd, 4, &tmp); // Set to IPv4 _SysIOCtl(fd, 6, addr); // Set address to 0.0.0.0 tmp = 0; _SysIOCtl(fd, 7, &tmp); // Set subnet mask to 0 // Open UDP Client snprintf(path, sizeof(path), "/Devices/ip/%i/udp", Iface->Num); - Iface->SocketFD = fd = _SysOpen(path, O_RDWR); + Iface->SocketFD = fd = _SysOpen(path, OPENFLAG_READ|OPENFLAG_WRITE); if( fd == -1 ) { fprintf(stderr, "ERROR: Unable to open '%s'\n", path); return -1; } - tmp = 68; _SysIOCtl(fd, 4, &tmp); // Local port - tmp = 67; _SysIOCtl(fd, 5, &tmp); // Remote port - tmp = 0; _SysIOCtl(fd, 7, &tmp); // Remote addr mask bits - we don't care where the reply comes from + tmp = 68; _SysIOCtl(fd, UDP_IOCTL_GETSETLPORT, &tmp); // Local port + tmp = 67; _SysIOCtl(fd, UDP_IOCTL_GETSETRPORT, &tmp); // Remote port + tmp = 0; _SysIOCtl(fd, UDP_IOCTL_GETSETRMASK, &tmp); // Remote addr mask bits - don't care source addr[0] = addr[1] = addr[2] = addr[3] = 255; // 255.255.255.255 - _SysIOCtl(fd, 8, addr); // Remote address + _SysIOCtl(fd, UDP_IOCTL_SETRADDR, addr); // Remote address return 0; } @@ -278,6 +301,7 @@ void Send_DHCPDISCOVER(tInterface *Iface) msg->siaddr = htonl(0); // siaddr - Zero? maybe -1 msg->giaddr = htonl(0); // giaddr - Zero? memcpy(msg->chaddr, Iface->HWAddr, 6); + memset(msg->chaddr+6, 0, sizeof(msg->chaddr)-6); memset(msg->sname, 0, sizeof(msg->sname)); // Nuke the rest memset(msg->file, 0, sizeof(msg->file)); // Nuke the rest @@ -287,14 +311,19 @@ void Send_DHCPDISCOVER(tInterface *Iface) msg->options[i++] = 53; // DHCP Message Type msg->options[i++] = 1; msg->options[i++] = 1; // - DHCPDISCOVER - msg->options[i++] = 255; // End of list + msg->options[i ] = 255; // End of list + // UDP Header data[0] = 67; data[1] = 0; // Port data[2] = 4; data[3] = 0; // AddrType data[4] = 255; data[5] = 255; data[6] = 255; data[7] = 255; - _SysWrite(Iface->SocketFD, data, sizeof(data)); + i = _SysWrite(Iface->SocketFD, data, sizeof(data)); + if( i != sizeof(data) ) { + _SysDebug("_SysWrite failed (%i != %i): %s", i, sizeof(data), + strerror(errno)); + } Update_State(Iface, STATE_DISCOVER_SENT); } @@ -304,14 +333,19 @@ void Send_DHCPREQUEST(tInterface *Iface, void *OfferPacket, int TypeOffset) int i; msg = (void*) ((char*)OfferPacket) + 8; + if( msg->xid != htonl(Iface->TransactionID) ) { + _SysDebug("DHCPREQUEST: Transaction ID mismatch"); + return ; + } + // Reuses old data :) - msg->op = 1; - msg->htype = 1; - msg->hlen = 6; - msg->hops = 0; - msg->xid = msg->xid; - msg->secs = htons(0); // TODO: Maintain times - msg->flags = htons(0); + msg->op = htonb(1); + msg->htype = htonb(1); + msg->hlen = htonb(6); + msg->hops = htonb(0); + msg->xid = htonl(Iface->TransactionID); + msg->secs = htons( (_SysTimestamp()-Iface->StartTime+499)/1000 ); // TODO: Maintain times + msg->flags = htons(0x0000); memcpy(msg->chaddr, Iface->HWAddr, 6); memset(msg->sname, 0, sizeof(msg->sname)); // Nuke the rest memset(msg->file, 0, sizeof(msg->file)); // Nuke the rest @@ -354,7 +388,7 @@ int Handle_Packet(tInterface *Iface) void *router = NULL; void *subnet_mask = NULL; - _SysDebug("Doing read on %i", Iface->SocketFD); + _SysDebug("Doing read on %s %i", Iface->Adapter, Iface->SocketFD); len = _SysRead(Iface->SocketFD, data, sizeof(data)); _SysDebug("len = %i", len); @@ -439,17 +473,24 @@ int Handle_Packet(tInterface *Iface) return 0; } -void Handle_Timeout(tInterface *Iface) +int Handle_Timeout(tInterface *Iface) { + if( Iface->nTimeouts == 3 ) + return 1; switch(Iface->State) { case STATE_DISCOVER_SENT: + fprintf(stderr, "DHCPDISCOVER timeout on %s, trying again\n", Iface->Adapter); Send_DHCPDISCOVER(Iface); break; + case STATE_REQUEST_SENT: + fprintf(stderr, "DHCPREQUEST timeout on %s\n", Iface->Adapter); + return 1; default: - _SysDebug("Timeout with state = %i", Iface->State); - break; + _SysDebug("Timeout with state = %i (%s)", Iface->State, Iface->Adapter); + return 1; } + return 0; } void Update_State(tInterface *Iface, int newState) @@ -458,12 +499,16 @@ void Update_State(tInterface *Iface, int newState) { Iface->Timeout = _SysTimestamp() + 500; Iface->State = newState; + Iface->nTimeouts = 0; } else { // TODO: Exponential backoff Iface->Timeout = _SysTimestamp() + 3000; - _SysDebug("State %i repeated, timeout is 3000ms now", newState); + Iface->nTimeouts ++; + _SysDebug("%s: State %i repeated, timeout is 3000ms now", + Iface->Adapter, + newState); } } @@ -515,7 +560,7 @@ void SetAddress(tInterface *Iface, void *Addr, void *Mask, void *Router) _SysIOCtl(Iface->IfaceFD, 6, Addr); _SysIOCtl(Iface->IfaceFD, 7, &mask_bits); - if( Router ); + if( Router ) { uint8_t *addr = Router; _SysDebug("Router %i.%i.%i.%i", addr[0], addr[1], addr[2], addr[3]);