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#include "EXTERN.h" |
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#include "perl.h" |
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#include "XSUB.h" |
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|
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#include <inttypes.h> |
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#include <unistd.h> |
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#include <endian.h> |
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|
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#include <sys/ioctl.h> |
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#include <netinet/in.h> |
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#include <byteswap.h> |
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|
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typedef uint32_t u32; |
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typedef uint64_t u64; |
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#include "nbd.h" |
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|
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#if __BYTE_ORDER == __BIG_ENDIAN |
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#define ntohll(netlong) (netlong) |
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#elif __BYTE_ORDER == __LITTLE_ENDIAN |
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#define ntohll(netlong) __bswap_64(netlong) |
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#else |
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error, you should not exist |
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#endif |
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|
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struct rstate { |
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struct nbd_request req; |
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u32 req_read; /* how many octets of req are valid */ |
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u32 data_read; /* how many octets of the data sv are valid */ |
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}; |
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|
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MODULE = Linux::NBD PACKAGE = Linux::NBD::Client |
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|
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PROTOTYPES: DISABLE |
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|
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void |
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_set_sock (int dev, int fd) |
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CODE: |
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ioctl (dev, NBD_SET_SOCK, (unsigned long)fd); |
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|
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void |
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_doit (int dev, int server = 0) |
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CODE: |
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if (server) |
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for (server = 0; server < 4095; server++) |
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if (server != dev) |
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close (server); |
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|
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ioctl (dev, NBD_DO_IT); |
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|
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if (server) |
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_exit (0); |
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|
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void |
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_disconnect (int dev) |
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CODE: |
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ioctl (dev, NBD_DISCONNECT); |
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|
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void |
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_clear_sock (int dev) |
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ALIAS: |
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_clear_sock = NBD_CLEAR_SOCK |
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_clear_que = NBD_CLEAR_QUE |
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CODE: |
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ioctl (dev, ix); |
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|
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void |
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_set_blksize (int dev, unsigned long arg) |
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ALIAS: |
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_set_blksize = NBD_SET_BLKSIZE |
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_set_size = NBD_SET_SIZE |
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_set_size_blocks = NBD_SET_SIZE_BLOCKS |
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_set_timeout = NBD_SET_TIMEOUT |
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_set_flags = NBD_SET_FLAGS |
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CODE: |
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ioctl (dev, ix, arg); |
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|
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void |
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_print_debug (int dev) |
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CODE: |
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ioctl (dev, NBD_PRINT_DEBUG, 0); |
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|
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MODULE = Linux::NBD PACKAGE = Linux::NBD::Server |
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|
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void |
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_one_request (SV *obj, int fd) |
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CODE: |
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{ |
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struct rstate *s; |
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u64 from; |
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u32 len; |
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char *method; |
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MAGIC *mg = mg_find (SvRV (obj), PERL_MAGIC_ext); |
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|
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if (!mg) |
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{ |
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mg = sv_magicext (SvRV (obj), 0, PERL_MAGIC_ext, 0, 0, 0); |
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mg->mg_len = sizeof (struct rstate); |
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New (0, mg->mg_ptr, mg->mg_len, char); |
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|
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((struct rstate *)mg->mg_ptr)->req_read = 0; /* initialise the state machine */ |
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} |
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|
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s = (struct rstate *)mg->mg_ptr; |
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|
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if (s->req_read < sizeof (struct nbd_request)) |
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{ |
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int res = read (fd, s->req_read + (char *)&s->req, sizeof (struct nbd_request) - s->req_read); |
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|
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if (res > 0) |
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s->req_read += res; |
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else if (res == 0) |
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XSRETURN_UNDEF; /* should req->eof */ |
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else if (errno != EAGAIN && errno != EWOULDBLOCK) |
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XSRETURN_UNDEF; /* should req->error */ |
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|
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s->data_read = 0; |
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|
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if (s->req_read < sizeof (struct nbd_request)) |
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XSRETURN_NO; |
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} |
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|
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/* now we have a full request, so check for data */ |
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if (s->req.magic != htonl (NBD_REQUEST_MAGIC)) |
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croak ("Linux::NBD::Server received illegal request magic %08lx - protocol error.\n", ntohl (s->req.magic)); |
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|
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from = ntohll (s->req.from); |
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len = ntohl (s->req.len); |
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|
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switch (ntohl (s->req.type)) |
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{ |
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case NBD_CMD_WRITE: |
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if (!mg->mg_obj) |
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{ |
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mg->mg_flags |= MGf_REFCOUNTED; |
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mg->mg_obj = NEWSV (0, len); |
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SvPOK_only (mg->mg_obj); |
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SvCUR_set (mg->mg_obj, len); |
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} |
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|
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if (s->data_read < len) |
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{ |
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int res = read (fd, s->data_read + SvPVX (mg->mg_obj), len - s->data_read); |
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|
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if (res > 0) |
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s->data_read += res; |
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else if (res == 0) |
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XSRETURN_UNDEF; /* should req->eof */ |
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else if (errno != EAGAIN && errno != EWOULDBLOCK) |
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XSRETURN_UNDEF; /* should req->error */ |
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|
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if (s->data_read < len) |
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XSRETURN_NO; |
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} |
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|
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/* fallthrough */ |
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case NBD_CMD_READ: |
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case NBD_CMD_FLUSH: |
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case NBD_CMD_TRIM: |
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case NBD_CMD_WRITE_ZEROES: |
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s->req_read = 0; |
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|
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PUSHMARK (SP); |
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EXTEND (SP, 4); |
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PUSHs (obj); |
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PUSHs (sv_2mortal (newSVpvn (s->req.handle, sizeof (s->req.handle)))); |
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PUSHs (sv_2mortal (sizeof (UV) < 8 && from > 0xffffffffUL |
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? newSVnv (from) |
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: newSVuv (from))); |
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|
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if (mg->mg_obj) |
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{ |
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PUSHs (sv_2mortal (mg->mg_obj)); |
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mg->mg_obj = 0; |
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method = "req_write"; |
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} |
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else |
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{ |
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PUSHs (sv_2mortal (newSVuv (len))); |
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method = s->req.type == NBD_CMD_READ ? "req_read" |
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: s->req.type == NBD_CMD_FLUSH ? "req_flush" |
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: s->req.type == NBD_CMD_TRIM ? "req_trim" |
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: s->req.type == NBD_CMD_WRITE_ZEROES ? "req_write_zeroes" |
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: (abort (), ""); |
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} |
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|
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break; |
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|
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case NBD_CMD_DISC: |
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s->req_read = 0; |
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|
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method = "req_disc"; |
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|
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PUSHMARK (SP); |
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XPUSHs (obj); |
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|
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break; |
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|
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default: |
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croak ("Linux::NBD::Server received unsupported request type %d.\n", ntohl (s->req.type)); |
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} |
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|
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PUTBACK; |
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call_method (method, G_DISCARD); |
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SPAGAIN; |
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|
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XSRETURN_YES; |
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} |
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|
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SV * |
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format_reply (SV *unused, SV *handle, unsigned int error = 0, SV *data = 0) |
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CODE: |
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{ |
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struct nbd_reply rep; |
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STRLEN len; |
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char *h = SvPV (handle, len); |
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|
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if (len != sizeof (rep.handle)) |
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croak ("format_reply: illegal handle (length %d, should be %d)", len, sizeof (rep.handle)); |
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|
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rep.magic = htonl (NBD_REPLY_MAGIC); |
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rep.error = htonl (error); |
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memcpy (rep.handle, h, sizeof (rep.handle)); |
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|
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RETVAL = newSVpvn ((char *)&rep, sizeof (rep)); |
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|
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if (data && !error) |
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sv_catsv (RETVAL, data); |
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} |
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OUTPUT: |
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RETVAL |
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|
