115 lines
5.1 KiB
C
115 lines
5.1 KiB
C
#include <stdio.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <sys/stat.h>
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#include <arpa/inet.h>
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#include <sys/time.h>
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#include <fcntl.h>
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#include <signal.h>
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/****************************************************************************
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* UBUF is the structure of message exchanged between server and clients.
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*
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* The 'buf' part of the buffer is variable lenght up to max of 1024.
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* The 'key' field is used by the server for sequence identification.
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* The 'seq' field is used by the client for sequence identification.
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*
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* Client's message to server contain a key value that is the same as the
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* key value of the previous message received from the server. Similarly,
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* the server's message to client contains a seq value that is the same
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* as the seq value of the previous message from the client.
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*
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* The buf field is logically partitioned into two parts by the len field.
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* The len field indicate the size of the first part of the buffer starting
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* at buf[0]. The rest of the buffer is the second field. In some cases
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* both fields can contain information.
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*
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****************************************************************************/
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#define UBUF_HSIZE 12 /* 12 bytes for the header */
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#define UBUF_SPACE 1024 /* maximum payload. */
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typedef struct UBUF { char cmd; /* message code. */
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unsigned char sum; /* message checksum. */
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unsigned short key; /* message key. */
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unsigned short seq; /* message sequence number. */
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unsigned short len; /* number of bytes in buf 1. */
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unsigned long pos; /* location in the file. */
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char buf[UBUF_SPACE];
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} UBUF;
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/* definition of cmd */
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#define CC_VERSION 0x10 /* return server's version string. */
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#define CC_ERR 0x40 /* error response from server. */
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#define CC_GET_DIR 0x41 /* get a directory listing. */
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#define CC_GET_FILE 0x42 /* get a file. */
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#define CC_UP_LOAD 0x43 /* open a file for writing. */
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#define CC_INSTALL 0x44 /* close a file opened for writing. */
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#define CC_DEL_FILE 0x45 /* delete a file. */
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#define CC_DEL_DIR 0x46 /* delete a directory. */
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#define CC_GET_PRO 0x47 /* get directory protection. */
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#define CC_SET_PRO 0x48 /* set directory protection. */
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#define CC_MAKE_DIR 0x49 /* create a directory. */
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#define CC_BYE 0x4A /* finish a session. */
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/****************************************************************************
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* RDIRENT is the structure of a directory entry contained in a .FSP_CONTENT
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* file. Each entry contains a 4 bytes quantity 'time', a 4 bytes quentity
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* 'size', and 1 byte of 'type'. Then followed by x number of bytes of
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* 'name'. 'name' is null terminated. Then followed by enough number of
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* padding to fill to an 4-byte boundary. At this point, if the next entry
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* to follow will spread across 1k boundary, then two possible things will
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* happen. 1) if the header fits between this entry and the 1k boundary,
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* a complete header will be filled in with a 'type' set to RDTYPE_SKIP.
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* And then enough bytes to padd to 1k boundary. 2) if the header does
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* not fit, then simply pad to the 1k boundary. This will make sure that
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* messages carrying directory information carry only complete directory
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* entries and no fragmented entries. The last entry is type RDTYPE_END.
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****************************************************************************/
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#define RDHSIZE (2*sizeof(unsigned long)+sizeof(unsigned char))
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typedef struct RDIRENT { unsigned long time;
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unsigned long size;
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unsigned char type;
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char name[1]; } RDIRENT;
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#define RDTYPE_END 0x00
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#define RDTYPE_FILE 0x01
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#define RDTYPE_DIR 0x02
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#define RDTYPE_SKIP 0x2A
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#define NULLP ((void *) 0)
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/****************************************************************************
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* These structures are used to implement a opendir/readdir mechanism similar
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* to that of the normal opendir/reader mechanism in unix.
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****************************************************************************/
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typedef struct DDLIST { struct DDLIST *next;
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char *path;
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RDIRENT **dep_root;
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int ref_cnt; } DDLIST;
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typedef struct RDIR { DDLIST *ddp;
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RDIRENT **dep; } RDIR;
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typedef struct rdirent { unsigned long d_fileno;
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unsigned short d_reclen;
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unsigned short d_namlen;
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char *d_name; } rdirent;
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UBUF *client_interact(unsigned cmd, unsigned long pos, unsigned l1, unsigned char *p1,unsigned l2, unsigned char *p2);
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void client_intr(int);
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void init_client(char *host,int port,int myport);
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int _x_select(fd_set *rf, long tt);
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int _x_udp(int *port);
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int _x_adr(char *host,int port,struct sockaddr_in *his);
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