#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
+#include <sys/select.h> /* select */
#include <sys/wait.h> /* wait */
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#include <dirent.h>
#include <unistd.h>
#include <getopt.h>
+#include <pwd.h>
+#include <grp.h>
#include <glib.h>
/** Where our config file actually is */
gchar* config_file_pos;
-/** how much space for child PIDs we have by default. Dynamically
- allocated, and will be realloc()ed if out of space, so this should
- probably be fair for most situations. */
-#define DEFAULT_CHILD_ARRAY 256
+/** What user we're running as */
+gchar* runuser=NULL;
+/** What group we're running as */
+gchar* rungroup=NULL;
/** Logging macros, now nothing goes to syslog unless you say ISSERVER */
#ifdef ISSERVER
#define DEBUG( a ) printf( a )
#define DEBUG2( a,b ) printf( a,b )
#define DEBUG3( a,b,c ) printf( a,b,c )
+#define DEBUG4( a,b,c,d ) printf( a,b,c,d )
#else
#define DEBUG( a )
#define DEBUG2( a,b )
#define DEBUG3( a,b,c )
+#define DEBUG4( a,b,c,d )
#endif
#ifndef PACKAGE_VERSION
#define PACKAGE_VERSION ""
#endif
/**
- * The highest value a variable of type off_t can reach.
+ * The highest value a variable of type off_t can reach. This is a signed
+ * integer, so set all bits except for the leftmost one.
**/
-/* This is starting to get ugly. If someone knows a better way to find
- * the maximum value of a signed type *without* relying on overflow
- * (doing so breaks on 64bit architectures), that would be nice.
- *
- * Actually, do we need this at all? Can't we just say '0 is autodetect', and
- * live with it? Or better yet, use an extra flag, or so?
- * Answer: yes, we need it, as the hunksize is defined to this when the
- * multiple file thingy isn't used.
- */
-#define OFFT_MAX (((((off_t)1)<<((sizeof(off_t)-1)*8))-1)<<7)+127
+#define OFFT_MAX ~((off_t)1<<(sizeof(off_t)*8-1))
#define LINELEN 256 /**< Size of static buffer used to read the
authorization file (yuck) */
#define BUFSIZE (1024*1024) /**< Size of buffer that can hold requests */
-#define GIGA (1*1024*1024*1024) /**< 1 Gigabyte. Used as hunksize when doing
- the multiple file thingy. @todo: make this a
- configuration option. */
#define DIFFPAGESIZE 4096 /**< diff file uses those chunks */
#define F_READONLY 1 /**< flag to tell us a file is readonly */
#define F_MULTIFILE 2 /**< flag to tell us a file is exported using -m */
#define F_COPYONWRITE 4 /**< flag to tell us a file is exported using
copyonwrite */
#define F_AUTOREADONLY 8 /**< flag to tell us a file is set to autoreadonly */
+#define F_SPARSE 16
GHashTable *children;
char pidfname[256]; /**< name of our PID file */
-char default_authname[] = "/etc/nbd_server.allow"; /**< default name of allow file */
+char pidftemplate[256]; /**< template to be used for the filename of the PID file */
+char default_authname[] = SYSCONFDIR "/nbd-server/allow"; /**< default name of allow file */
+
+/**
+ * Types of virtuatlization
+ **/
+typedef enum {
+ VIRT_NONE=0, /**< No virtualization */
+ VIRT_IPLIT, /**< Literal IP address as part of the filename */
+ VIRT_IPHASH, /**< Replacing all dots in an ip address by a / before
+ doing the same as in IPLIT */
+ VIRT_CIDR, /**< Every subnet in its own directory */
+} VIRT_STYLE;
/**
* Variables associated with a server.
**/
typedef struct {
gchar* exportname; /**< (unprocessed) filename of the file we're exporting */
- off_t hunksize; /**< size of a hunk of an exported file */
off_t expected_size; /**< size of the exported file as it was told to
us through configuration */
unsigned int port; /**< port we're exporting this file at */
unsigned int timeout;/**< how long a connection may be idle
(0=forever) */
int socket; /**< The socket of this server. */
+ VIRT_STYLE virtstyle;/**< The style of virtualization, if any */
+ uint8_t cidrlen; /**< The length of the mask when we use
+ CIDR-style virtualization */
} SERVER;
/**
* Variables associated with a client socket.
**/
typedef struct {
+ int fhandle; /**< file descriptor */
+ off_t startoff; /**< starting offset of this file */
+} FILE_INFO;
+
+typedef struct {
off_t exportsize; /**< size of the file we're exporting */
char *clientname; /**< peer */
char *exportname; /**< (processed) filename of the file we're exporting */
- GArray *export; /**< array of filedescriptors of exported files;
- only the first is actually used unless we're
+ GArray *export; /**< array of FILE_INFO of exported files;
+ array size is always 1 unless we're
doing the multiple file option */
int net; /**< The actual client socket */
SERVER *server; /**< The server this client is getting data from */
PARAM_STRING, /**< This parameter is a string */
PARAM_BOOL, /**< This parameter is a boolean */
} PARAM_TYPE;
+
/**
* Configuration file values
**/
* @return 0 - authorization refused, 1 - OK
**/
int authorized_client(CLIENT *opts) {
+ const char *ERRMSG="Invalid entry '%s' in authfile '%s', so, refusing all connections.";
FILE *f ;
-
char line[LINELEN];
+ char *tmp;
+ struct in_addr addr;
+ struct in_addr client;
+ struct in_addr cltemp;
+ int len;
if ((f=fopen(opts->server->authname,"r"))==NULL) {
msg4(LOG_INFO,"Can't open authorization file %s (%s).",
return 1 ;
}
+ inet_aton(opts->clientname, &client);
while (fgets(line,LINELEN,f)!=NULL) {
+ if((tmp=index(line, '/'))) {
+ if(strlen(line)<=tmp-line) {
+ msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
+ return 0;
+ }
+ *(tmp++)=0;
+ if(inet_aton(line,&addr)) {
+ msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
+ return 0;
+ }
+ len=strtol(tmp, NULL, 0);
+ addr.s_addr>>=32-len;
+ addr.s_addr<<=32-len;
+ memcpy(&cltemp,&client,sizeof(client));
+ cltemp.s_addr>>=32-len;
+ cltemp.s_addr<<=32-len;
+ if(addr.s_addr == cltemp.s_addr) {
+ return 1;
+ }
+ }
if (strncmp(line,opts->clientname,strlen(opts->clientname))==0) {
fclose(f);
return 1;
}
}
- fclose(f) ;
- return 0 ;
+ fclose(f);
+ return 0;
}
/**
**/
inline void readit(int f, void *buf, size_t len) {
ssize_t res;
+ gboolean tried = FALSE;
+
while (len > 0) {
DEBUG("*");
- if ((res = read(f, buf, len)) <= 0)
- err("Read failed: %m");
- len -= res;
- buf += res;
+ if ((res = read(f, buf, len)) <= 0) {
+ if(!tried && errno==EAGAIN) {
+ /* Assume the connection will work some time in
+ * the future, but don't run away with CPU time
+ * in case it doesn't */
+ fd_set set;
+ struct timeval tv;
+
+ DEBUG("Read failed, trying again");
+ tried=TRUE;
+ FD_ZERO(&set);
+ FD_SET(f, &set);
+ tv.tv_sec=30;
+ tv.tv_usec=0;
+ select(f+1, &set, NULL, NULL, &tv);
+ } else {
+ err("Read failed: %m");
+ }
+ } else {
+ len -= res;
+ buf += res;
+ tried=FALSE;
+ }
}
}
**/
inline void writeit(int f, void *buf, size_t len) {
ssize_t res;
+ gboolean tried=FALSE;
+
while (len > 0) {
DEBUG("+");
- if ((res = write(f, buf, len)) <= 0)
- err("Send failed: %m");
- len -= res;
- buf += res;
+ if ((res = write(f, buf, len)) <= 0) {
+ if(!tried && errno==EAGAIN) {
+ /* Assume the connection will work some time in
+ * the future, but don't run away with CPU time
+ * in case it doesn't */
+ fd_set set;
+ struct timeval tv;
+
+ DEBUG("Write failed, trying again");
+ tried=TRUE;
+ FD_ZERO(&set);
+ FD_SET(f, &set);
+ tv.tv_sec=30;
+ tv.tv_usec=0;
+ select(f+1, NULL, &set, NULL, &tv);
+ } else {
+ err("Send failed: %m");
+ }
+ } else {
+ len -= res;
+ buf += res;
+ tried=FALSE;
+ }
}
}
*/
void usage() {
printf("This is nbd-server version " VERSION "\n");
- printf("Usage: port file_to_export [size][kKmM] [-l authorize_file] [-r] [-m] [-c] [-a timeout_sec] [-C configuration file]\n"
+ printf("Usage: port file_to_export [size][kKmM] [-l authorize_file] [-r] [-m] [-c] [-a timeout_sec] [-C configuration file] [-p PID file name]\n"
"\t-r|--read-only\t\tread only\n"
"\t-m|--multi-file\t\tmultiple file\n"
"\t-c|--copy-on-write\tcopy on write\n"
- "\t-C|--config-file\tspecify an alternat configuration file\n"
+ "\t-C|--config-file\tspecify an alternate configuration file\n"
"\t-l|--authorize-file\tfile with list of hosts that are allowed to\n\t\t\t\tconnect.\n"
- "\t-a|--idle-time\t\tmaximum idle seconds; server terminates when\n\t\t\t\tidle time exceeded\n\n"
+ "\t-a|--idle-time\t\tmaximum idle seconds; server terminates when\n\t\t\t\tidle time exceeded\n"
+ "\t-p|--pid-file\t\tspecify a filename to write our PID to\n\n"
"\tif port is set to 0, stdin is used (for running from inetd)\n"
"\tif file_to_export contains '%%s', it is substituted with the IP\n"
"\t\taddress of the machine trying to connect\n" );
{"authorize-file", required_argument, NULL, 'l'},
{"idle-time", required_argument, NULL, 'a'},
{"config-file", required_argument, NULL, 'C'},
+ {"pid-file", required_argument, NULL, 'p'},
{0,0,0,0}
};
SERVER *serve;
return NULL;
}
serve=g_new0(SERVER, 1);
- serve->hunksize=OFFT_MAX;
serve->authname = g_strdup(default_authname);
- while((c=getopt_long(argc, argv, "-a:C:cl:mr", long_options, &i))>=0) {
+ while((c=getopt_long(argc, argv, "-a:C:cl:mrp:", long_options, &i))>=0) {
switch (c) {
case 1:
/* non-option argument */
break;
case 'm':
serve->flags |= F_MULTIFILE;
- serve->hunksize = 1*GIGA;
+ break;
+ case 'p':
+ strncpy(pidftemplate, optarg, 256);
break;
case 'c':
serve->flags |=F_COPYONWRITE;
* @param f the name of the config file
* @param e a GError. @see CFILE_ERRORS for what error values this function can
* return.
- * @return a GHashTable of SERVER* pointers, with the port number as the hash
- * key. If the config file is empty or does not exist, returns an empty
- * GHashTable; if the config file contains an error, returns NULL, and
- * e is set appropriately
+ * @return a Array of SERVER* pointers, If the config file is empty or does not
+ * exist, returns an empty GHashTable; if the config file contains an
+ * error, returns NULL, and e is set appropriately
**/
GArray* parse_cfile(gchar* f, GError** e) {
+ const char* DEFAULT_ERROR = "Could not parse %s in group %s: %s";
+ const char* MISSING_REQUIRED_ERROR = "Could not find required value %s in group %s: %s";
SERVER s;
- PARAM p[] = {
+ gchar *virtstyle=NULL;
+ PARAM lp[] = {
{ "exportname", TRUE, PARAM_STRING, NULL, 0 },
{ "port", TRUE, PARAM_INT, NULL, 0 },
{ "authfile", FALSE, PARAM_STRING, NULL, 0 },
{ "timeout", FALSE, PARAM_INT, NULL, 0 },
{ "filesize", FALSE, PARAM_INT, NULL, 0 },
+ { "virtstyle", FALSE, PARAM_STRING, NULL, 0 },
{ "readonly", FALSE, PARAM_BOOL, NULL, F_READONLY },
{ "multifile", FALSE, PARAM_BOOL, NULL, F_MULTIFILE },
{ "copyonwrite", FALSE, PARAM_BOOL, NULL, F_COPYONWRITE },
+ { "autoreadonly", FALSE, PARAM_BOOL, NULL, F_AUTOREADONLY },
+ { "sparse_cow", FALSE, PARAM_BOOL, NULL, F_SPARSE },
};
- const int p_size=8;
+ const int lp_size=11;
+ PARAM gp[] = {
+ { "user", FALSE, PARAM_STRING, &runuser, 0 },
+ { "group", FALSE, PARAM_STRING, &rungroup, 0 },
+ };
+ PARAM* p=gp;
+ int p_size=2;
GKeyFile *cfile;
GError *err = NULL;
+ const char *err_msg=NULL;
GQuark errdomain;
GArray *retval=NULL;
gchar **groups;
gboolean value;
- gint i,j;
+ gint i;
+ gint j;
- memset(&s, '\0', sizeof(SERVER));
errdomain = g_quark_from_string("parse_cfile");
cfile = g_key_file_new();
retval = g_array_new(FALSE, TRUE, sizeof(SERVER));
return NULL;
}
groups = g_key_file_get_groups(cfile, NULL);
- for(i=1;groups[i];i++) {
- p[0].target=&(s.exportname);
- p[1].target=&(s.port);
- p[2].target=&(s.authname);
- p[3].target=&(s.timeout);
- p[4].target=&(s.expected_size);
- p[5].target=p[6].target=p[7].target=p[8].target=&(s.flags);
+ for(i=0;groups[i];i++) {
+ memset(&s, '\0', sizeof(SERVER));
+ lp[0].target=&(s.exportname);
+ lp[1].target=&(s.port);
+ lp[2].target=&(s.authname);
+ lp[3].target=&(s.timeout);
+ lp[4].target=&(s.expected_size);
+ lp[5].target=&(virtstyle);
+ lp[6].target=lp[7].target=lp[8].target=
+ lp[9].target=lp[10].target=&(s.flags);
+ /* After the [generic] group, start parsing exports */
+ if(i==1) {
+ p=lp;
+ p_size=lp_size;
+ }
for(j=0;j<p_size;j++) {
g_assert(p[j].target != NULL);
g_assert(p[j].ptype==PARAM_INT||p[j].ptype==PARAM_STRING||p[j].ptype==PARAM_BOOL);
groups[i],
p[j].paramname, &err);
if(!err) {
- *((gint*)p[j].target) |= value;
+ if(value) {
+ *((gint*)p[j].target) |= p[j].flagval;
+ } else {
+ *((gint*)p[j].target) &= ~(p[j].flagval);
+ }
}
break;
}
if(err) {
if(err->code == G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
- if(p[j].required) {
- g_set_error(e, errdomain, CFILE_KEY_MISSING, "Could not find required value %s in group %s: %s", p[j].paramname, groups[i], err->message);
- g_array_free(retval, TRUE);
- g_error_free(err);
- g_key_file_free(cfile);
- return NULL;
- } else {
+ if(!p[j].required) {
+ /* Ignore not-found error for optional values */
g_clear_error(&err);
continue;
+ } else {
+ err_msg = MISSING_REQUIRED_ERROR;
}
- g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Could not parse %s in group %s: %s", p[j].paramname, groups[i], err->message);
+ } else {
+ err_msg = DEFAULT_ERROR;
+ }
+ g_set_error(e, errdomain, CFILE_VALUE_INVALID, err_msg, p[j].paramname, groups[i], err->message);
+ g_array_free(retval, TRUE);
+ g_error_free(err);
+ g_key_file_free(cfile);
+ return NULL;
+ }
+ }
+ if(virtstyle) {
+ if(!strncmp(virtstyle, "none", 4)) {
+ s.virtstyle=VIRT_NONE;
+ } else if(!strncmp(virtstyle, "ipliteral", 9)) {
+ s.virtstyle=VIRT_IPLIT;
+ } else if(!strncmp(virtstyle, "iphash", 6)) {
+ s.virtstyle=VIRT_IPHASH;
+ } else if(!strncmp(virtstyle, "cidrhash", 8)) {
+ s.virtstyle=VIRT_CIDR;
+ if(strlen(virtstyle)<10) {
+ g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s: missing length", virtstyle, groups[i]);
g_array_free(retval, TRUE);
- g_error_free(err);
g_key_file_free(cfile);
return NULL;
}
+ s.cidrlen=strtol(virtstyle+8, NULL, 0);
+ } else {
+ g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s", virtstyle, groups[i]);
+ g_array_free(retval, TRUE);
+ g_key_file_free(cfile);
+ return NULL;
}
+ } else {
+ s.virtstyle=VIRT_IPLIT;
+ }
+ /* Don't need to free this, it's not our string */
+ virtstyle=NULL;
+ /* Don't append values for the [generic] group */
+ if(i>0) {
+ g_array_append_val(retval, s);
}
- g_array_append_val(retval, s);
}
return retval;
}
* is severely wrong)
**/
void sigchld_handler(int s) {
- int* status=NULL;
+ int status;
int* i;
pid_t pid;
- while((pid=wait(status)) > 0) {
- if(WIFEXITED(status)) {
+ while((pid=waitpid(-1, &status, WNOHANG)) > 0) {
+ if(WIFEXITED(&status)) {
msg3(LOG_INFO, "Child exited with %d", WEXITSTATUS(status));
}
i=g_hash_table_lookup(children, &pid);
/**
* Detect the size of a file.
*
- * @param export An open filedescriptor
+ * @param fhandle An open filedescriptor
* @return the size of the file, or OFFT_MAX if detection was
* impossible.
**/
-off_t size_autodetect(int export) {
+off_t size_autodetect(int fhandle) {
off_t es;
u32 es32;
struct stat stat_buf;
#ifdef HAVE_SYS_MOUNT_H
#ifdef HAVE_SYS_IOCTL_H
#ifdef BLKGETSIZE
- DEBUG("looking for export size with ioctl BLKGETSIZE\n");
- if (!ioctl(export, BLKGETSIZE, &es32) && es32) {
+ DEBUG("looking for fhandle size with ioctl BLKGETSIZE\n");
+ if (!ioctl(fhandle, BLKGETSIZE, &es32) && es32) {
es = (off_t)es32 * (off_t)512;
return es;
}
#endif /* HAVE_SYS_IOCTL_H */
#endif /* HAVE_SYS_MOUNT_H */
- DEBUG("looking for export size with fstat\n");
+ DEBUG("looking for fhandle size with fstat\n");
stat_buf.st_size = 0;
- error = fstat(export, &stat_buf);
+ error = fstat(fhandle, &stat_buf);
if (!error) {
if(stat_buf.st_size > 0)
return (off_t)stat_buf.st_size;
err("fstat failed: %m");
}
- DEBUG("looking for export size with lseek SEEK_END\n");
- es = lseek(export, (off_t)0, SEEK_END);
+ DEBUG("looking for fhandle size with lseek SEEK_END\n");
+ es = lseek(fhandle, (off_t)0, SEEK_END);
if (es > ((off_t)0)) {
return es;
} else {
}
/**
+ * Get the file handle and offset, given an export offset.
+ *
+ * @param export An array of export files
+ * @param a The offset to get corresponding file/offset for
+ * @param fhandle [out] File descriptor
+ * @param foffset [out] Offset into fhandle
+ * @param maxbytes [out] Tells how many bytes can be read/written
+ * from fhandle starting at foffset (0 if there is no limit)
+ * @return 0 on success, -1 on failure
+ **/
+int get_filepos(GArray* export, off_t a, int* fhandle, off_t* foffset, size_t* maxbytes ) {
+ /* Negative offset not allowed */
+ if(a < 0)
+ return -1;
+
+ /* Binary search for last file with starting offset <= a */
+ FILE_INFO fi;
+ int start = 0;
+ int end = export->len - 1;
+ while( start <= end ) {
+ int mid = (start + end) / 2;
+ fi = g_array_index(export, FILE_INFO, mid);
+ if( fi.startoff < a ) {
+ start = mid + 1;
+ } else if( fi.startoff > a ) {
+ end = mid - 1;
+ } else {
+ start = end = mid;
+ break;
+ }
+ }
+
+ /* end should never go negative, since first startoff is 0 and a >= 0 */
+ g_assert(end >= 0);
+
+ fi = g_array_index(export, FILE_INFO, end);
+ *fhandle = fi.fhandle;
+ *foffset = a - fi.startoff;
+ *maxbytes = 0;
+ if( end+1 < export->len ) {
+ FILE_INFO fi_next = g_array_index(export, FILE_INFO, end+1);
+ *maxbytes = fi_next.startoff - a;
+ }
+
+ return 0;
+}
+
+/**
* seek to a position in a file, with error handling.
* @param handle a filedescriptor
* @param a position to seek to
* @param client The client we're serving for
* @return The number of bytes actually written, or -1 in case of an error
**/
-int rawexpwrite(off_t a, char *buf, size_t len, CLIENT *client) {
- ssize_t res;
+ssize_t rawexpwrite(off_t a, char *buf, size_t len, CLIENT *client) {
+ int fhandle;
+ off_t foffset;
+ size_t maxbytes;
+
+ if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
+ return -1;
+ if(maxbytes && len > maxbytes)
+ len = maxbytes;
+
+ DEBUG4("(WRITE to fd %d offset %Lu len %u), ", fhandle, foffset, len);
- myseek(g_array_index(client->export, int, (int)(a/client->server->hunksize)), a%client->server->hunksize);
- ;
- res = write(g_array_index(client->export, int, (int)((off_t)a/(off_t)(client->server->hunksize))), buf, len);
- return (res < 0 || (size_t)res != len);
+ myseek(fhandle, foffset);
+ return write(fhandle, buf, len);
+}
+
+/**
+ * Call rawexpwrite repeatedly until all data has been written.
+ * @return 0 on success, nonzero on failure
+ **/
+int rawexpwrite_fully(off_t a, char *buf, size_t len, CLIENT *client) {
+ ssize_t ret;
+
+ while(len > 0 && (ret=rawexpwrite(a, buf, len, client)) > 0 ) {
+ a += ret;
+ buf += ret;
+ len -= ret;
+ }
+ return (ret < 0 || len != 0);
}
/**
* @return The number of bytes actually read, or -1 in case of an
* error.
**/
-int rawexpread(off_t a, char *buf, size_t len, CLIENT *client) {
- ssize_t res;
+ssize_t rawexpread(off_t a, char *buf, size_t len, CLIENT *client) {
+ int fhandle;
+ off_t foffset;
+ size_t maxbytes;
+
+ if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
+ return -1;
+ if(maxbytes && len > maxbytes)
+ len = maxbytes;
+
+ DEBUG4("(READ from fd %d offset %Lu len %u), ", fhandle, foffset, len);
+
+ myseek(fhandle, foffset);
+ return read(fhandle, buf, len);
+}
+
+/**
+ * Call rawexpread repeatedly until all data has been read.
+ * @return 0 on success, nonzero on failure
+ **/
+int rawexpread_fully(off_t a, char *buf, size_t len, CLIENT *client) {
+ ssize_t ret;
- myseek(g_array_index(client->export,int,(int)a/client->server->hunksize),
- a%client->server->hunksize);
- res = read(g_array_index(client->export,int,(int)a/client->server->hunksize), buf, len);
- return (res < 0 || (size_t)res != len);
+ while(len > 0 && (ret=rawexpread(a, buf, len, client)) > 0 ) {
+ a += ret;
+ buf += ret;
+ len -= ret;
+ }
+ return (ret < 0 || len != 0);
}
/**
* @param buf A buffer to read into
* @param len The size of buf
* @param client The client we're going to read for
- * @return The number of bytes actually read, or -1 in case of an error
+ * @return 0 on success, nonzero on failure
**/
int expread(off_t a, char *buf, size_t len, CLIENT *client) {
off_t rdlen, offset;
off_t mapcnt, mapl, maph, pagestart;
if (!(client->server->flags & F_COPYONWRITE))
- return rawexpread(a, buf, len, client);
+ return(rawexpread_fully(a, buf, len, client));
DEBUG3("Asked to read %d bytes at %Lu.\n", len, (unsigned long long)a);
mapl=a/DIFFPAGESIZE; maph=(a+len-1)/DIFFPAGESIZE;
} else { /* the block is not there */
DEBUG2("Page %Lu is not here, we read the original one\n",
(unsigned long long)mapcnt);
- if(rawexpread(a, buf, rdlen, client)) return -1;
+ if(rawexpread_fully(a, buf, rdlen, client)) return -1;
}
len-=rdlen; a+=rdlen; buf+=rdlen;
}
* @param buf The buffer to write from
* @param len The length of buf
* @param client The client we're going to write for.
- * @return The number of bytes actually written, or -1 in case of an error
+ * @return 0 on success, nonzero on failure
**/
int expwrite(off_t a, char *buf, size_t len, CLIENT *client) {
char pagebuf[DIFFPAGESIZE];
off_t offset;
if (!(client->server->flags & F_COPYONWRITE))
- return(rawexpwrite(a,buf,len, client));
+ return(rawexpwrite_fully(a, buf, len, client));
DEBUG3("Asked to write %d bytes at %Lu.\n", len, (unsigned long long)a);
mapl=a/DIFFPAGESIZE ; maph=(a+len-1)/DIFFPAGESIZE ;
if (write(client->difffile, buf, wrlen) != wrlen) return -1 ;
} else { /* the block is not there */
myseek(client->difffile,client->difffilelen*DIFFPAGESIZE) ;
- client->difmap[mapcnt]=client->difffilelen++ ;
+ client->difmap[mapcnt]=(client->server->flags&F_SPARSE)?mapcnt:client->difffilelen++;
DEBUG3("Page %Lu is not here, we put it at %lu\n",
(unsigned long long)mapcnt,
(unsigned long)(client->difmap[mapcnt]));
rdlen=DIFFPAGESIZE ;
- if (rdlen+pagestart%(client->server->hunksize) >
- (client->server->hunksize))
- rdlen=client->server->hunksize -
- (pagestart%client->server->hunksize);
- if (rawexpread(pagestart, pagebuf, rdlen, client))
+ if (rawexpread_fully(pagestart, pagebuf, rdlen, client))
return -1;
memcpy(pagebuf+offset,buf,wrlen) ;
if (write(client->difffile, pagebuf, DIFFPAGESIZE) !=
char zeros[300];
u64 size_host;
- memset(zeros, 0, 290);
+ memset(zeros, '\0', 290);
if (write(client->net, INIT_PASSWD, 8) < 0)
err("Negotiation failed: %m");
cliserv_magic = htonll(cliserv_magic);
if (request.type==NBD_CMD_DISC) {
msg2(LOG_INFO, "Disconnect request received.");
- if (client->difmap) g_free(client->difmap) ;
- if (client->difffile>=0) {
+ if (client->server->flags & F_COPYONWRITE) {
+ if (client->difmap) g_free(client->difmap) ;
close(client->difffile);
unlink(client->difffilename);
free(client->difffilename);
continue;
}
- if (((ssize_t)((off_t)request.from + len) > client->exportsize) ||
- ((client->server->flags & F_READONLY) && request.type)) {
+ if (((ssize_t)((off_t)request.from + len) > client->exportsize)) {
DEBUG("[RANGE!]");
ERROR(client, reply);
continue;
DEBUG("wr: net->buf, ");
readit(client->net, buf, len);
DEBUG("buf->exp, ");
- if ((client->server->flags & F_AUTOREADONLY) ||
- expwrite(request.from, buf, len,
- client)) {
+ if ((client->server->flags & F_READONLY) ||
+ (client->server->flags & F_AUTOREADONLY)) {
+ DEBUG("[WRITE to READONLY!]");
+ ERROR(client, reply);
+ continue;
+ }
+ if (expwrite(request.from, buf, len, client)) {
DEBUG("Write failed: %m" );
ERROR(client, reply);
continue;
}
/**
- * Split a single exportfile into multiple ones, if that was asked.
- * @return 0 on success, -1 on failure
- * @param client information on the client which we want to split
+ * Set up client export array, which is an array of FILE_INFO.
+ * Also, split a single exportfile into multiple ones, if that was asked.
+ * @param client information on the client which we want to setup export for
**/
-int splitexport(CLIENT* client) {
- off_t i;
- int fhandle;
+void setupexport(CLIENT* client) {
+ int i;
+ off_t laststartoff = 0, lastsize = 0;
+ int multifile = (client->server->flags & F_MULTIFILE);
+
+ client->export = g_array_new(TRUE, TRUE, sizeof(FILE_INFO));
- client->export = g_array_new(TRUE, TRUE, sizeof(int));
- for (i=0; i<client->exportsize; i+=client->server->hunksize) {
+ /* If multi-file, open as many files as we can.
+ * If not, open exactly one file.
+ * Calculate file sizes as we go to get total size. */
+ for(i=0; ; i++) {
+ FILE_INFO fi;
gchar *tmpname;
+ mode_t mode = (client->server->flags & F_READONLY) ? O_RDONLY : O_RDWR;
- if(client->server->flags & F_MULTIFILE) {
- tmpname=g_strdup_printf("%s.%d", client->exportname,
- (int)(i/client->server->hunksize));
+ if(multifile) {
+ tmpname=g_strdup_printf("%s.%d", client->exportname, i);
} else {
tmpname=g_strdup(client->exportname);
}
DEBUG2( "Opening %s\n", tmpname );
- if((fhandle = open(tmpname, (client->server->flags & F_READONLY) ? O_RDONLY : O_RDWR)) == -1) {
- /* Read WRITE ACCESS was requested by media is only read only */
- client->server->flags |= F_AUTOREADONLY;
- client->server->flags |= F_READONLY;
- if((fhandle = open(tmpname, O_RDONLY)) == -1)
- err("Could not open exported file: %m");
+ fi.fhandle = open(tmpname, mode);
+ if(fi.fhandle == -1 && mode == O_RDWR) {
+ /* Try again because maybe media was read-only */
+ fi.fhandle = open(tmpname, O_RDONLY);
+ if(fi.fhandle != -1) {
+ client->server->flags |= F_AUTOREADONLY;
+ client->server->flags |= F_READONLY;
+ }
}
- g_array_insert_val(client->export,i/client->server->hunksize,fhandle);
+ if(fi.fhandle == -1) {
+ if(multifile && i>0)
+ break;
+ err("Could not open exported file: %m");
+ }
+ fi.startoff = laststartoff + lastsize;
+ g_array_append_val(client->export, fi);
g_free(tmpname);
+
+ /* Starting offset and size of this file will be used to
+ * calculate starting offset of next file */
+ laststartoff = fi.startoff;
+ lastsize = size_autodetect(fi.fhandle);
+
+ if(!multifile)
+ break;
+ }
+
+ /* Set export size to total calculated size */
+ client->exportsize = laststartoff + lastsize;
+
+ /* Export size may be overridden */
+ if(client->server->expected_size) {
+ /* desired size must be <= total calculated size */
+ if(client->server->expected_size > client->exportsize) {
+ err("Size of exported file is too big\n");
+ }
+
+ client->exportsize = client->server->expected_size;
+ }
+
+ msg3(LOG_INFO, "Size of exported file/device is %Lu", (unsigned long long)client->exportsize);
+ if(multifile) {
+ msg3(LOG_INFO, "Total number of files: %d", i);
}
- return 0;
}
int copyonwrite_prepare(CLIENT* client) {
* @param client a connected client
**/
void serveconnection(CLIENT *client) {
- splitexport(client);
-
- if (!client->server->expected_size) {
- client->exportsize = size_autodetect(g_array_index(client->export,int,0));
- } else {
- /* Perhaps we should check first. Not now. */
- client->exportsize = client->server->expected_size;
- }
- if (client->exportsize > OFFT_MAX) {
- /* uhm, well... In a parallel universe, this *might* be
- * possible... */
- err("Size of exported file is too big\n");
- }
- else {
- msg3(LOG_INFO, "size of exported file/device is %Lu", (unsigned long long)client->exportsize);
- }
+ setupexport(client);
if (client->server->flags & F_COPYONWRITE) {
copyonwrite_prepare(client);
/**
* Find the name of the file we have to serve. This will use g_strdup_printf
* to put the IP address of the client inside a filename containing
- * "%s". That name is then written to client->exportname.
+ * "%s" (in the form as specified by the "virtstyle" option). That name
+ * is then written to client->exportname.
*
* @param net A socket connected to an nbd client
* @param client information about the client. The IP address in human-readable
**/
void set_peername(int net, CLIENT *client) {
struct sockaddr_in addrin;
- int addrinlen = sizeof( addrin );
- char *peername ;
+ struct sockaddr_in netaddr;
+ size_t addrinlen = sizeof( addrin );
+ char *peername;
+ char *netname;
+ char *tmp;
+ int i;
if (getpeername(net, (struct sockaddr *) &addrin, (socklen_t *)&addrinlen) < 0)
err("getsockname failed: %m");
- peername = inet_ntoa(addrin.sin_addr);
- client->exportname=g_strdup_printf(client->server->exportname, peername);
+ peername = g_strdup(inet_ntoa(addrin.sin_addr));
+ switch(client->server->virtstyle) {
+ case VIRT_NONE:
+ client->exportname=g_strdup(client->server->exportname);
+ break;
+ case VIRT_IPHASH:
+ for(i=0;i<strlen(peername);i++) {
+ if(peername[i]=='.') {
+ peername[i]='/';
+ }
+ }
+ case VIRT_IPLIT:
+ client->exportname=g_strdup_printf(client->server->exportname, peername);
+ break;
+ case VIRT_CIDR:
+ memcpy(&netaddr, &addrin, addrinlen);
+ netaddr.sin_addr.s_addr>>=32-(client->server->cidrlen);
+ netaddr.sin_addr.s_addr<<=32-(client->server->cidrlen);
+ netname = inet_ntoa(netaddr.sin_addr);
+ tmp=g_strdup_printf("%s/%s", netname, peername);
+ client->exportname=g_strdup_printf(client->server->exportname, tmp);
+ break;
+ }
+ g_free(peername);
msg4(LOG_INFO, "connect from %s, assigned file is %s",
peername, client->exportname);
client->clientname=g_strdup(peername);
if(daemon(0,0)<0) {
err("daemon");
}
- if(serve) {
- snprintf(pidfname, sizeof(char)*255, "/var/run/nbd-server.%d.pid", serve->port);
- } else {
- strncpy(pidfname, "/var/run/nbd-server.pid", sizeof(char)*255);
+ if(!*pidftemplate) {
+ if(serve) {
+ strncpy(pidftemplate, "/var/run/server.%d.pid", 255);
+ } else {
+ strncpy(pidftemplate, "/var/run/server.pid", 255);
+ }
}
+ snprintf(pidfname, 255, pidftemplate, serve ? serve->port : 0);
pidf=fopen(pidfname, "w");
if(pidf) {
fprintf(pidf,"%d\n", (int)getpid());
struct sockaddr_in addrin;
struct sigaction sa;
int addrinlen = sizeof(addrin);
+ int sock_flags;
#ifndef sun
int yes=1;
#else
err("setsockopt SO_KEEPALIVE");
}
+ /* make the listening socket non-blocking */
+ if ((sock_flags = fcntl(serve->socket, F_GETFL, 0)) == -1) {
+ err("fcntl F_GETFL");
+ }
+ if (fcntl(serve->socket, F_SETFL, sock_flags | O_NONBLOCK) == -1) {
+ err("fcntl F_SETFL O_NONBLOCK on server socket");
+ }
+
DEBUG("Waiting for connections... bind, ");
addrin.sin_family = AF_INET;
addrin.sin_port = htons(serve->port);
sa.sa_flags = SA_RESTART;
if(sigaction(SIGTERM, &sa, NULL) == -1)
err("sigaction: %m");
- children=g_hash_table_new_full(g_int_hash, g_int_equal, NULL, destroy_pid_t);
}
/**
for(i=0;i<servers->len;i++) {
setup_serve(&(g_array_index(servers, SERVER, i)));
}
+ children=g_hash_table_new_full(g_int_hash, g_int_equal, NULL, destroy_pid_t);
}
/**
struct sockaddr_in addrin;
socklen_t addrinlen=sizeof(addrin);
SERVER *serve;
- int i, max, sock;
- fd_set mset, rset;
+ int i;
+ int max;
+ int sock;
+ fd_set mset;
+ fd_set rset;
struct timeval tv;
/*
for(i=0;i<servers->len;i++) {
serve=&(g_array_index(servers, SERVER, i));
if(FD_ISSET(serve->socket, &rset)) {
+ int sock_flags;
+
if ((net=accept(serve->socket, (struct sockaddr *) &addrin, &addrinlen)) < 0)
err("accept: %m");
client = g_malloc(sizeof(CLIENT));
client->server=serve;
client->exportsize=OFFT_MAX;
+ if ((sock_flags = fcntl(serve->socket, F_GETFL, 0)) == -1) {
+ err("fcntl F_GETFL");
+ }
+ if (fcntl(net, F_SETFL, sock_flags | O_NONBLOCK) == -1) {
+ err("fcntl F_SETFL O_NONBLOCK on client socket");
+ }
client->net=net;
set_peername(net, client);
if (!authorized_client(client)) {
}
/**
+ * Set up user-ID and/or group-ID
+ **/
+void dousers(void) {
+ struct passwd *pw;
+ struct group *gr;
+ if(runuser) {
+ pw=getpwnam(runuser);
+ if(setuid(pw->pw_uid)<0)
+ msg3(LOG_DEBUG, "Could not set UID: %s", strerror(errno));
+ }
+ if(rungroup) {
+ gr=getgrnam(rungroup);
+ if(setgid(gr->gr_gid)<0)
+ msg3(LOG_DEBUG, "Could not set GID: %s", strerror(errno));
+ }
+}
+
+/**
* Main entry point...
**/
int main(int argc, char *argv[]) {
exit(-1) ;
}
+ memset(pidftemplate, '\0', 256);
+
logging();
config_file_pos = g_strdup(CFILE);
serve=cmdline(argc, argv);
}
daemonize(serve);
setup_servers(servers);
+ dousers();
serveloop(servers);
return 0 ;
}
projects / nbd.git / blobdiff