diff options
Diffstat (limited to 'daemon/rfcnb/session.c')
| -rw-r--r-- | daemon/rfcnb/session.c | 364 |
1 files changed, 364 insertions, 0 deletions
diff --git a/daemon/rfcnb/session.c b/daemon/rfcnb/session.c new file mode 100644 index 0000000..981fda8 --- /dev/null +++ b/daemon/rfcnb/session.c @@ -0,0 +1,364 @@ +/* UNIX RFCNB (RFC1001/RFC1002) NetBIOS implementation + + Version 1.0 + Session Routines ... + + Copyright (C) Richard Sharpe 1996 + +*/ + +/* + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +int RFCNB_errno = 0; +int RFCNB_saved_errno = 0; +#define RFCNB_ERRNO + +#include "std-includes.h" +#include <netinet/tcp.h> +#include "rfcnb-priv.h" +#include "rfcnb-util.h" + +int RFCNB_Stats[RFCNB_MAX_STATS]; + +void (*Prot_Print_Routine)() = NULL; /* Pointer to print routine */ + +/* Set up a session with a remote name. We are passed Called_Name as a + string which we convert to a NetBIOS name, ie space terminated, up to + 16 characters only if we need to. If Called_Address is not empty, then + we use it to connect to the remote end, but put in Called_Name ... Called + Address can be a DNS based name, or a TCP/IP address ... +*/ + +void *RFCNB_Call(char *Called_Name, char *Calling_Name, char *Called_Address, + int port) + +{ struct RFCNB_Con *con; + struct in_addr Dest_IP; + int Client; + BOOL redirect; struct redirect_addr *redir_addr; + char *Service_Address; + + /* Now, we really should look up the port in /etc/services ... */ + + if (port == 0) port = RFCNB_Default_Port; + + /* Create a connection structure first */ + + if ((con = (struct RFCNB_Con *)malloc(sizeof(struct RFCNB_Con))) == NULL) { /* Error in size */ + + RFCNB_errno = RFCNBE_NoSpace; + RFCNB_saved_errno = errno; + return(NULL); + + } + + con -> fd = -0; /* no descriptor yet */ + con -> err = 0; /* no error yet */ + con -> timeout = 0; /* no timeout */ + con -> redirects = 0; + + /* Resolve that name into an IP address */ + + Service_Address = Called_Name; + if (strcmp(Called_Address, "") != 0) { /* If the Called Address = "" */ + Service_Address = Called_Address; + } + + if ((errno = RFCNB_Name_To_IP(Service_Address, &Dest_IP)) < 0) { /* Error */ + + /* No need to modify RFCNB_errno as it was done by RFCNB_Name_To_IP */ + + return(NULL); + + } + + /* Now connect to the remote end */ + + redirect = TRUE; /* Fudge this one so we go once through */ + + while (redirect) { /* Connect and get session info etc */ + + redirect = FALSE; /* Assume all OK */ + + /* Build the redirect info. First one is first addr called */ + /* And tack it onto the list of addresses we called */ + + if ((redir_addr = (struct redirect_addr *)malloc(sizeof(struct redirect_addr))) == NULL) { /* Could not get space */ + + RFCNB_errno = RFCNBE_NoSpace; + RFCNB_saved_errno = errno; + return(NULL); + + } + + memcpy((char *)&(redir_addr -> ip_addr), (char *)&Dest_IP, sizeof(Dest_IP)); + redir_addr -> port = port; + redir_addr -> next = NULL; + + if (con -> redirect_list == NULL) { /* Stick on head */ + + con -> redirect_list = con -> last_addr = redir_addr; + + } else { + + con -> last_addr -> next = redir_addr; + con -> last_addr = redir_addr; + + } + + /* Now, make that connection */ + + if ((Client = RFCNB_IP_Connect(Dest_IP, port)) < 0) { /* Error */ + + /* No need to modify RFCNB_errno as it was done by RFCNB_IP_Connect */ + + return(NULL); + + } + + con -> fd = Client; + + /* Now send and handle the RFCNB session request */ + /* If we get a redirect, we will comeback with redirect true + and a new IP address in DEST_IP */ + + if ((errno = RFCNB_Session_Req(con, + Called_Name, + Calling_Name, + &redirect, &Dest_IP, &port)) < 0) { + + /* No need to modify RFCNB_errno as it was done by RFCNB_Session.. */ + + return(NULL); + + } + + if (redirect) { + + /* We have to close the connection, and then try again */ + + (con -> redirects)++; + + RFCNB_Close(con -> fd); /* Close it */ + + } + } + + return(con); + +} + +/* We send a packet to the other end ... for the moment, we treat the + data as a series of pointers to blocks of data ... we should check the + length ... */ + +int RFCNB_Send(struct RFCNB_Con *Con_Handle, struct RFCNB_Pkt *udata, int Length) + +{ struct RFCNB_Pkt *pkt; char *hdr; + int len; + + /* Plug in the header and send the data */ + + pkt = RFCNB_Alloc_Pkt(RFCNB_Pkt_Hdr_Len); + + if (pkt == NULL) { + + RFCNB_errno = RFCNBE_NoSpace; + RFCNB_saved_errno = errno; + return(RFCNBE_Bad); + + } + + pkt -> next = udata; /* The user data we want to send */ + + hdr = pkt -> data; + + /* Following crap is for portability across multiple UNIX machines */ + + *(hdr + RFCNB_Pkt_Type_Offset) = RFCNB_SESSION_MESSAGE; + RFCNB_Put_Pkt_Len(hdr, Length); + +#ifdef RFCNB_DEBUG + + fprintf(stderr, "Sending packet: "); + +#endif + + if ((len = RFCNB_Put_Pkt(Con_Handle, pkt, Length + RFCNB_Pkt_Hdr_Len)) < 0) { + + /* No need to change RFCNB_errno as it was done by put_pkt ... */ + + return(RFCNBE_Bad); /* Should be able to write that lot ... */ + + } + + /* Now we have sent that lot, let's get rid of the RFCNB Header and return */ + + pkt -> next = NULL; + + RFCNB_Free_Pkt(pkt); + + return(len); + +} + +/* We pick up a message from the internet ... We have to worry about + non-message packets ... */ + +int RFCNB_Recv(void *con_Handle, struct RFCNB_Pkt *Data, int Length) + +{ struct RFCNB_Pkt *pkt; struct RFCNB_Hdr *hdr; + int ret_len; + + if (con_Handle == NULL){ + + RFCNB_errno = RFCNBE_BadHandle; + RFCNB_saved_errno = errno; + return(RFCNBE_Bad); + + } + + /* Now get a packet from below. We allocate a header first */ + + /* Plug in the header and send the data */ + + pkt = RFCNB_Alloc_Pkt(RFCNB_Pkt_Hdr_Len); + + if (pkt == NULL) { + + RFCNB_errno = RFCNBE_NoSpace; + RFCNB_saved_errno = errno; + return(RFCNBE_Bad); + + } + + pkt -> next = Data; /* Plug in the data portion */ + + if ((ret_len = RFCNB_Get_Pkt(con_Handle, pkt, Length + RFCNB_Pkt_Hdr_Len)) < 0) { + +#ifdef RFCNB_DEBUG + fprintf(stderr, "Bad packet return in RFCNB_Recv... \n"); +#endif + + return(RFCNBE_Bad); + + } + + /* We should check that we go a message and not a keep alive */ + + pkt -> next = NULL; + + RFCNB_Free_Pkt(pkt); + + return(ret_len); + +} + +/* We just disconnect from the other end, as there is nothing in the RFCNB */ +/* protocol that specifies any exchange as far as I can see */ + +int RFCNB_Hangup(struct RFCNB_Con *con_Handle) + +{ + + if (con_Handle != NULL) { + RFCNB_Close(con_Handle -> fd); /* Could this fail? */ + free(con_Handle); + } + + return 0; + + +} + +/* Set TCP_NODELAY on the socket */ + +int RFCNB_Set_Sock_NoDelay(struct RFCNB_Con *con_Handle, BOOL yn) + +{ + + return(setsockopt(con_Handle -> fd, IPPROTO_TCP, TCP_NODELAY, + (char *)&yn, sizeof(yn))); + +} + + +/* Listen for a connection on a port???, when */ +/* the connection comes in, we return with the connection */ + +void *RFCNB_Listen() + +{ + +} + +/* Pick up the last error response as a string, hmmm, this routine should */ +/* have been different ... */ + +void RFCNB_Get_Error(char *buffer, int buf_len) + +{ + + if (RFCNB_saved_errno <= 0) { + sprintf(buffer, "%s", RFCNB_Error_Strings[RFCNB_errno]); + } + else { + sprintf(buffer, "%s\n\terrno:%s", RFCNB_Error_Strings[RFCNB_errno], + strerror(RFCNB_saved_errno)); + } + +} + +/* Pick up the last error response and returns as a code */ + +int RFCNB_Get_Last_Error() + +{ + + return(RFCNB_errno); + +} + +/* Pick up saved errno as well */ + +int RFCNB_Get_Last_Errno() + +{ + + return(RFCNB_saved_errno); + +} + +/* Pick up the last error response and return in string ... */ + +int RFCNB_Get_Error_Msg(int code, char *msg_buf, int len) + +{ + + strncpy(msg_buf, RFCNB_Error_Strings[abs(code)], len); + +} + +/* Register a higher level protocol print routine */ + +void RFCNB_Register_Print_Routine(void (*fn)()) + +{ + + Prot_Print_Routine = fn; + +} |