Factor out the bulk of client_serve_request, and add convenience converters in src/nbdtypes.c
This commit is contained in:
Alex Young
57
src/nbdtypes.c
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57
src/nbdtypes.c
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@@ -0,0 +1,57 @@
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#include "nbdtypes.h"
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#include <string.h>
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#include <endian.h>
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/**
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* We intentionally ignore the reserved 128 bytes at the end of the
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* request, since there's nothing we can do with them.
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*/
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void nbd_r2h_init( struct nbd_init_raw * from, struct nbd_init * to )
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{
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memcpy( to->passwd, from->passwd, 8 );
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to->magic = be64toh( from->magic );
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to->size = be64toh( from->size );
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}
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void nbd_h2r_init( struct nbd_init * from, struct nbd_init_raw * to)
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{
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memcpy( to->passwd, from->passwd, 8 );
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to->magic = htobe64( from->magic );
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to->size = htobe64( from->size );
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}
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void nbd_r2h_request( struct nbd_request_raw *from, struct nbd_request * to )
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{
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to->magic = htobe32( from->magic );
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to->type = htobe32( from->type );
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memcpy( to->handle, from->handle, 8 );
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to->from = htobe64( from->from );
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to->len = htobe32( from->len );
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}
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void nbd_h2r_request( struct nbd_request * from, struct nbd_request_raw * to )
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{
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to->magic = be32toh( from->magic );
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to->type = be32toh( from->type );
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memcpy( to->handle, from->handle, 8 );
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to->from = be64toh( from->from );
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to->len = be32toh( from->len );
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}
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void nbd_r2h_reply( struct nbd_reply_raw * from, struct nbd_reply * to )
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{
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to->magic = htobe32( from->magic );
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to->error = htobe32( from->error );
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memcpy( to->handle, from->handle, 8 );
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}
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void nbd_h2r_reply( struct nbd_reply * from, struct nbd_reply_raw * to )
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{
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to->magic = be32toh( from->magic );
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to->error = be32toh( from->error );
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memcpy( to->handle, from->handle, 8 );
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}
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@@ -1,6 +1,7 @@
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#ifndef __NBDTYPES_H
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#define __NBDTYPES_H
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/* http://linux.derkeiler.com/Mailing-Lists/Kernel/2003-09/2332.html */
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#define INIT_PASSWD "NBDMAGIC"
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#define INIT_MAGIC 0x0000420281861253
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@@ -10,15 +11,26 @@
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#define REQUEST_WRITE 1
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#define REQUEST_DISCONNECT 2
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#ifndef _LARGEFILE64_SOURCE
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# define _LARGEFILE64_SOURCE
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#endif
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#include <linux/types.h>
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struct nbd_init {
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#include <inttypes.h>
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/* The _raw types are the types as they appear on the wire. Non-_raw
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* types are in host-format.
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* Conversion functions are _r2h_ for converting raw to host, and _h2r_
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* for converting host to raw.
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*/
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struct nbd_init_raw {
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char passwd[8];
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__be64 magic;
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__be64 size;
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char reserved[128];
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};
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struct nbd_request {
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struct nbd_request_raw {
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__be32 magic;
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__be32 type; /* == READ || == WRITE */
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char handle[8];
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@@ -26,11 +38,43 @@ struct nbd_request {
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__be32 len;
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} __attribute__((packed));
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struct nbd_reply {
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struct nbd_reply_raw {
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__be32 magic;
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__be32 error; /* 0 = ok, else error */
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char handle[8]; /* handle you got from request */
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};
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struct nbd_init {
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char passwd[8];
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uint64_t magic;
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uint64_t size;
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char reserved[128];
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};
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struct nbd_request {
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uint32_t magic;
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uint32_t type; /* == READ || == WRITE */
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char handle[8];
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uint64_t from;
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uint32_t len;
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} __attribute__((packed));
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struct nbd_reply {
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uint32_t magic;
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uint32_t error; /* 0 = ok, else error */
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char handle[8]; /* handle you got from request */
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};
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void nbd_r2h_init( struct nbd_init_raw * from, struct nbd_init * to );
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void nbd_r2h_request( struct nbd_request_raw *from, struct nbd_request * to );
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void nbd_r2h_reply( struct nbd_reply_raw * from, struct nbd_reply * to );
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void nbd_h2r_init( struct nbd_init * from, struct nbd_init_raw * to);
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void nbd_h2r_request( struct nbd_request * from, struct nbd_request_raw * to );
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void nbd_h2r_reply( struct nbd_reply * from, struct nbd_reply_raw * to );
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#endif
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@@ -2,7 +2,10 @@
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#define __PARAMS_H
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#define _GNU_SOURCE
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#ifndef _LARGEFILE64_SOURCE
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# define _LARGEFILE64_SOURCE
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#endif
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#include "parse.h"
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198
src/serve.c
198
src/serve.c
@@ -132,11 +132,12 @@ void write_not_zeroes(struct client_params* client, off64_t from, int len)
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}
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}
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int client_serve_request(struct client_params* client)
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/* Returns 1 if *request was filled with a valid request which we should
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* try to honour. 0 otherwise. */
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int client_read_request( struct client_params * client , struct nbd_request *out_request )
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{
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off64_t offset;
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struct nbd_request request;
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struct nbd_reply reply;
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struct nbd_request_raw request_raw;
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fd_set fds;
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FD_ZERO(&fds);
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@@ -146,53 +147,135 @@ int client_serve_request(struct client_params* client)
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"select() failed");
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if (FD_ISSET(client->serve->close_signal[0], &fds))
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return 1;
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return 0;
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if (readloop(client->socket, &request, sizeof(request)) == -1) {
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if (readloop(client->socket, &request_raw, sizeof(request_raw)) == -1) {
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if (errno == 0) {
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debug("EOF reading request");
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return 1; /* neat point to close the socket */
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return 0; /* neat point to close the socket */
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}
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else {
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CLIENT_ERROR_ON_FAILURE(-1, "Error reading request");
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}
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}
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reply.magic = htobe32(REPLY_MAGIC);
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reply.error = htobe32(0);
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memcpy(reply.handle, request.handle, 8);
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nbd_r2h_request( &request_raw, out_request );
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debug("request type %d", be32toh(request.type));
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return 1;
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}
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if (be32toh(request.magic) != REQUEST_MAGIC)
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CLIENT_ERROR("Bad magic %08x", be32toh(request.magic));
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switch (be32toh(request.type))
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int client_write_reply( struct client_params * client, struct nbd_request *request, int error )
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{
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struct nbd_reply reply;
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struct nbd_reply_raw reply_raw;
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reply.magic = REPLY_MAGIC;
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reply.error = error;
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memcpy( reply.handle, &request->handle, 8 );
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nbd_h2r_reply( &reply, &reply_raw );
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write( client->socket, &reply_raw, sizeof( reply_raw ) );
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return 1;
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}
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int client_request_needs_reply( struct client_params * client, struct nbd_request request, int *request_err )
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{
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debug("request type %d", request.type);
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if (request.magic != REQUEST_MAGIC)
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CLIENT_ERROR("Bad magic %08x", request.magic);
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switch (request.type)
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{
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case REQUEST_READ:
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break;
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case REQUEST_WRITE:
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/* check it's not out of range */
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if (be64toh(request.from) < 0 ||
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be64toh(request.from)+be32toh(request.len) > client->serve->size) {
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if (request.from < 0 ||
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request.from+request.len > client->serve->size) {
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debug("request read %ld+%d out of range",
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be64toh(request.from),
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be32toh(request.len)
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request.from,
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request.len
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);
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reply.error = htobe32(1);
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write(client->socket, &reply, sizeof(reply));
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client_write_reply( client, &request, 1 );
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*request_err = 0;
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return 0;
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}
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break;
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case REQUEST_DISCONNECT:
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debug("request disconnect");
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return 1;
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*request_err = 1;
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return 0;
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default:
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CLIENT_ERROR("Unknown request %08x", be32toh(request.type));
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CLIENT_ERROR("Unknown request %08x", request.type);
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}
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return 1;
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}
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void client_reply_to_read( struct client_params* client, struct nbd_request request )
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{
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off64_t offset;
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debug("request read %ld+%d", request.from, request.len);
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client_write_reply( client, &request, 0);
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offset = request.from;
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CLIENT_ERROR_ON_FAILURE(
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sendfileloop(
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client->socket,
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client->fileno,
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&offset,
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request.len),
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"sendfile failed from=%ld, len=%d",
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offset,
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request.len);
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}
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void client_reply_to_write( struct client_params* client, struct nbd_request request )
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{
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debug("request write %ld+%d", request.from, request.len);
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if (client->serve->block_allocation_map) {
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write_not_zeroes( client, request.from, request.len );
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}
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else {
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CLIENT_ERROR_ON_FAILURE(
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readloop(
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client->socket,
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client->mapped + request.from,
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request.len),
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"read failed from=%ld, len=%d",
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request.from,
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request.len );
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dirty(client->serve, request.from, request.len);
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}
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client_write_reply( client, &request, 0);
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}
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void client_reply( struct client_params* client, struct nbd_request request )
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{
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switch (request.type) {
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case REQUEST_READ:
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client_reply_to_read( client, request );
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break;
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case REQUEST_WRITE:
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client_reply_to_write( client, request );
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break;
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}
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}
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int client_lock_io( struct client_params * client )
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{
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CLIENT_ERROR_ON_FAILURE(
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pthread_mutex_lock(&client->serve->l_io),
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"Problem with I/O lock"
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@@ -203,64 +286,43 @@ int client_serve_request(struct client_params* client)
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pthread_mutex_unlock(&client->serve->l_io),
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"Problem with I/O unlock"
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);
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return 0;
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}
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return 1;
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}
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switch (be32toh(request.type))
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void client_unlock_io( struct client_params * client )
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{
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case REQUEST_READ:
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debug("request read %ld+%d", be64toh(request.from), be32toh(request.len));
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write(client->socket, &reply, sizeof(reply));
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offset = be64toh(request.from);
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CLIENT_ERROR_ON_FAILURE(
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sendfileloop(
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client->socket,
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client->fileno,
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&offset,
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be32toh(request.len)
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),
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"sendfile failed from=%ld, len=%d",
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offset,
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be32toh(request.len)
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);
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break;
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case REQUEST_WRITE:
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debug("request write %ld+%d", be64toh(request.from), be32toh(request.len));
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if (client->serve->block_allocation_map) {
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write_not_zeroes(
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client,
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be64toh(request.from),
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be32toh(request.len)
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);
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}
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else {
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CLIENT_ERROR_ON_FAILURE(
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readloop(
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client->socket,
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client->mapped + be64toh(request.from),
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be32toh(request.len)
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),
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"read failed from=%ld, len=%d",
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be64toh(request.from),
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be32toh(request.len)
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);
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dirty(client->serve, be64toh(request.from), be32toh(request.len));
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}
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write(client->socket, &reply, sizeof(reply));
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break;
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}
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CLIENT_ERROR_ON_FAILURE(
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pthread_mutex_unlock(&client->serve->l_io),
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"Problem with I/O unlock"
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);
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}
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int client_serve_request(struct client_params* client)
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{
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struct nbd_request request;
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int request_err;
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if ( !client_read_request( client, &request ) ) { return 1; }
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if ( !client_request_needs_reply( client, request, &request_err ) ) {
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return request_err;
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}
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if ( client_lock_io( client ) ){
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client_reply( client, request );
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client_unlock_io( client );
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} else {
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return 1;
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}
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return 0;
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}
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void client_send_hello(struct client_params* client)
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{
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struct nbd_init init;
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223
tests/check_nbdtypes.c
Normal file
223
tests/check_nbdtypes.c
Normal file
@@ -0,0 +1,223 @@
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#include <check.h>
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#include "nbdtypes.h"
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START_TEST(test_init_passwd)
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{
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struct nbd_init_raw init_raw;
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struct nbd_init init;
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memcpy( init_raw.passwd, INIT_PASSWD, 8 );
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nbd_r2h_init( &init_raw, &init );
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memset( init_raw.passwd, 0, 8 );
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nbd_h2r_init( &init, &init_raw );
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fail_unless( memcmp( init.passwd, INIT_PASSWD, 8 ) == 0, "The password was not copied." );
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fail_unless( memcmp( init_raw.passwd, INIT_PASSWD, 8 ) == 0, "The password was not copied back." );
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}
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END_TEST
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START_TEST(test_init_magic)
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{
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struct nbd_init_raw init_raw;
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struct nbd_init init;
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init_raw.magic = 12345;
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nbd_r2h_init( &init_raw, &init );
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fail_unless( be64toh( 12345 ) == init.magic, "Magic was not converted." );
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init.magic = 67890;
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nbd_h2r_init( &init, &init_raw );
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fail_unless( htobe64( 67890 ) == init_raw.magic, "Magic was not converted back." );
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}
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END_TEST
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START_TEST(test_init_size)
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{
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struct nbd_init_raw init_raw;
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struct nbd_init init;
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init_raw.size = 12345;
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nbd_r2h_init( &init_raw, &init );
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fail_unless( be64toh( 12345 ) == init.size, "Size was not converted." );
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init.size = 67890;
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nbd_h2r_init( &init, &init_raw );
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fail_unless( htobe64( 67890 ) == init_raw.size, "Size was not converted back." );
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}
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END_TEST
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START_TEST(test_request_magic )
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{
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struct nbd_request_raw request_raw;
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struct nbd_request request;
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request_raw.magic = 12345;
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nbd_r2h_request( &request_raw, &request );
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fail_unless( be32toh( 12345 ) == request.magic, "Magic was not converted." );
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request.magic = 67890;
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nbd_h2r_request( &request, &request_raw );
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fail_unless( htobe32( 67890 ) == request_raw.magic, "Magic was not converted back." );
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}
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END_TEST
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START_TEST(test_request_type )
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{
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struct nbd_request_raw request_raw;
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struct nbd_request request;
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request_raw.type = 12345;
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nbd_r2h_request( &request_raw, &request );
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fail_unless( be32toh( 12345 ) == request.type, "Type was not converted." );
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request.type = 67890;
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nbd_h2r_request( &request, &request_raw );
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fail_unless( htobe32( 67890 ) == request_raw.type, "Type was not converted back." );
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}
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END_TEST
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|
||||
|
||||
START_TEST(test_request_handle)
|
||||
{
|
||||
struct nbd_request_raw request_raw;
|
||||
struct nbd_request request;
|
||||
|
||||
memcpy( request_raw.handle, "MYHANDLE", 8 );
|
||||
|
||||
nbd_r2h_request( &request_raw, &request );
|
||||
memset( request_raw.handle, 0, 8 );
|
||||
nbd_h2r_request( &request, &request_raw );
|
||||
|
||||
fail_unless( memcmp( request.handle, "MYHANDLE", 8 ) == 0, "The handle was not copied." );
|
||||
fail_unless( memcmp( request_raw.handle, "MYHANDLE", 8 ) == 0, "The handle was not copied back." );
|
||||
}
|
||||
END_TEST
|
||||
|
||||
|
||||
|
||||
START_TEST(test_request_from )
|
||||
{
|
||||
struct nbd_request_raw request_raw;
|
||||
struct nbd_request request;
|
||||
|
||||
request_raw.from = 12345;
|
||||
nbd_r2h_request( &request_raw, &request );
|
||||
fail_unless( be64toh( 12345 ) == request.from, "From was not converted." );
|
||||
|
||||
request.from = 67890;
|
||||
nbd_h2r_request( &request, &request_raw );
|
||||
fail_unless( htobe64( 67890 ) == request_raw.from, "From was not converted back." );
|
||||
}
|
||||
END_TEST
|
||||
|
||||
|
||||
|
||||
START_TEST(test_request_len )
|
||||
{
|
||||
struct nbd_request_raw request_raw;
|
||||
struct nbd_request request;
|
||||
|
||||
request_raw.len = 12345;
|
||||
nbd_r2h_request( &request_raw, &request );
|
||||
fail_unless( be32toh( 12345 ) == request.len, "Type was not converted." );
|
||||
|
||||
request.len = 67890;
|
||||
nbd_h2r_request( &request, &request_raw );
|
||||
fail_unless( htobe32( 67890 ) == request_raw.len, "Type was not converted back." );
|
||||
}
|
||||
END_TEST
|
||||
|
||||
|
||||
START_TEST(test_reply_magic )
|
||||
{
|
||||
struct nbd_reply_raw reply_raw;
|
||||
struct nbd_reply reply;
|
||||
|
||||
reply_raw.magic = 12345;
|
||||
nbd_r2h_reply( &reply_raw, &reply );
|
||||
fail_unless( be32toh( 12345 ) == reply.magic, "Magic was not converted." );
|
||||
|
||||
reply.magic = 67890;
|
||||
nbd_h2r_reply( &reply, &reply_raw );
|
||||
fail_unless( htobe32( 67890 ) == reply_raw.magic, "Magic was not converted back." );
|
||||
}
|
||||
END_TEST
|
||||
|
||||
|
||||
START_TEST(test_reply_error )
|
||||
{
|
||||
struct nbd_reply_raw reply_raw;
|
||||
struct nbd_reply reply;
|
||||
|
||||
reply_raw.error = 12345;
|
||||
nbd_r2h_reply( &reply_raw, &reply );
|
||||
fail_unless( be32toh( 12345 ) == reply.error, "Error was not converted." );
|
||||
|
||||
reply.error = 67890;
|
||||
nbd_h2r_reply( &reply, &reply_raw );
|
||||
fail_unless( htobe32( 67890 ) == reply_raw.error, "Error was not converted back." );
|
||||
}
|
||||
END_TEST
|
||||
|
||||
START_TEST(test_reply_handle)
|
||||
{
|
||||
struct nbd_reply_raw reply_raw;
|
||||
struct nbd_reply reply;
|
||||
|
||||
memcpy( reply_raw.handle, "MYHANDLE", 8 );
|
||||
|
||||
nbd_r2h_reply( &reply_raw, &reply );
|
||||
memset( reply_raw.handle, 0, 8 );
|
||||
nbd_h2r_reply( &reply, &reply_raw );
|
||||
|
||||
fail_unless( memcmp( reply.handle, "MYHANDLE", 8 ) == 0, "The handle was not copied." );
|
||||
fail_unless( memcmp( reply_raw.handle, "MYHANDLE", 8 ) == 0, "The handle was not copied back." );
|
||||
}
|
||||
END_TEST
|
||||
|
||||
|
||||
Suite *nbdtypes_suite()
|
||||
{
|
||||
Suite *s = suite_create( "nbdtypes" );
|
||||
TCase *tc_init = tcase_create( "nbd_init" );
|
||||
TCase *tc_request = tcase_create( "nbd_request" );
|
||||
TCase *tc_reply = tcase_create( "nbd_reply" );
|
||||
|
||||
tcase_add_test( tc_init, test_init_passwd );
|
||||
tcase_add_test( tc_init, test_init_magic );
|
||||
tcase_add_test( tc_init, test_init_size );
|
||||
tcase_add_test( tc_request, test_request_magic );
|
||||
tcase_add_test( tc_request, test_request_type );
|
||||
tcase_add_test( tc_request, test_request_handle );
|
||||
tcase_add_test( tc_request, test_request_from );
|
||||
tcase_add_test( tc_request, test_request_len );
|
||||
tcase_add_test( tc_reply, test_reply_magic );
|
||||
tcase_add_test( tc_reply, test_reply_error );
|
||||
tcase_add_test( tc_reply, test_reply_handle );
|
||||
|
||||
suite_add_tcase( s, tc_init );
|
||||
suite_add_tcase( s, tc_request );
|
||||
suite_add_tcase( s, tc_reply );
|
||||
|
||||
|
||||
return s;
|
||||
}
|
||||
|
||||
|
||||
int main(void)
|
||||
{
|
||||
int number_failed;
|
||||
Suite *s = nbdtypes_suite();
|
||||
SRunner *sr = srunner_create(s);
|
||||
srunner_run_all(sr, CK_NORMAL);
|
||||
number_failed = srunner_ntests_failed(sr);
|
||||
srunner_free(sr);
|
||||
return (number_failed == 0) ? 0 : 1;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user