* _FILE_OFFSET_BITS=64 and _LARGEFILE_SOURCE if you used to be
* using FS_32BIT. This will allow you to use files >2GB instead of
* having to use the -m option. Wouter Verhelst <wouter@debian.org>
+ * Version 2.4 - Added code to keep track of children, so that we can
+ * properly kill them from initscripts. Add a call to daemon(),
+ * so that processes don't think they have to wait for us, which is
+ * interesting for initscripts as well. Wouter Verhelst
+ * <wouter@debian.org>
+ * Version 2.5 - Bugfix release: forgot to reset child_arraysize to
+ * zero after fork()ing, resulting in nbd-server going berserk
+ * when it receives a signal with at least one child open. Wouter
+ * Verhelst <wouter@debian.org>
+ * 10/10/2003 - Added socket option SO_KEEPALIVE (sf.net bug 819235);
+ * rectified type of mainloop::size_host (sf.net bugs 814435 and
+ * 817385); close the PID file after writing to it, so that the
+ * daemon can actually be found. Wouter Verhelst
+ * <wouter@debian.org>
*/
-#define VERSION "2.3"
+#define VERSION PACKAGE_VERSION
#define GIGA (1*1024*1024*1024)
#include <sys/types.h>
// #define ISSERVER
#define MY_NAME "nbd_server"
-/* Authorization file should contain lines with IP addresses of
- clients authorized to use the server. If it does not exist,
- access is permitted. */
-#define AUTH_FILE "nbd_server.allow"
+/* 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
#include "cliserv.h"
//#undef _IO
/* Deep magic: ioctl.h defines _IO macro (at least on linux) */
-
/* Debugging macros, now nothing goes to syslog unless you say ISSERVER */
#ifdef ISSERVER
#define msg2(a,b) syslog(a,b)
#define msg4(a,b,c,d) do { fprintf(stderr,b,c,d); fputs("\n",stderr) ; } while(0)
#endif
-
#include <sys/ioctl.h>
#include <sys/mount.h> /* For BLKGETSIZE */
char difffilename[256];
unsigned int timeout = 0;
int autoreadonly = 0;
+char *auth_file="nbd_server.allow";
int authorized_client(char *name)
/* 0 - authorization refused, 1 - OK
authorization file contains one line per machine, no wildcards
*/
-{ FILE *f ;
+{
+ FILE *f ;
- char line[LINELEN] ;
+ char line[LINELEN] ;
- if ((f=fopen(AUTH_FILE,"r"))==NULL)
- { msg4(LOG_INFO,"Can't open authorization file %s (%s).",
- AUTH_FILE,strerror(errno)) ;
- return 1 ;
- }
+ if ((f=fopen(auth_file,"r"))==NULL) {
+ msg4(LOG_INFO,"Can't open authorization file %s (%s).",
+ auth_file,strerror(errno)) ;
+ return 1 ;
+ }
- while (fgets(line,LINELEN,f)!=NULL) {
- if (strncmp(line,name,strlen(name))==0) { fclose(f) ; return 1 ; }
- }
- fclose(f) ;
- return 0 ;
+ while (fgets(line,LINELEN,f)!=NULL) {
+ if (strncmp(line,name,strlen(name))==0) {
+ fclose(f);
+ return 1;
+ }
+ }
+ fclose(f) ;
+ return 0 ;
}
-
inline void readit(int f, void *buf, int len)
{
int res;
}
}
-#define OFFT_MAX (((off_t)1)<<(sizeof(off_t)*8))-1
+/* 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.
+ */
+#define OFFT_MAX (((((off_t)1)<<((sizeof(off_t)-1)*8))-1)<<7)+127
int port; /* Port I'm listening at */
char *exportname; /* File I'm exporting */
off_t exportsize = OFFT_MAX; /* ...and its length */
u32 difffilelen=0 ; /* number of pages in difffile */
u32 *difmap=NULL ;
char clientname[256] ;
-
+int child_arraysize=DEFAULT_CHILD_ARRAY;
+pid_t *children;
+char pidfname[256];
#define DIFFPAGESIZE 4096 /* diff file uses those chunks */
" -r read only\n"
" -m multiple file\n"
" -c copy on write\n"
+ " -l file with list of hosts that are allowed to connect.\n"
" -a maximum idle seconds, terminates when idle time exceeded\n"
" if port is set to 0, stdin is used (for running from inetd)\n"
" if file_to_export contains '%%s', it is substituted with IP\n"
break;
case 'c': flags |=F_COPYONWRITE;
break;
+ case 'l':
+ free(auth_file);
+ if (i+1<argc) {
+ auth_file=argv[++i];
+ } else {
+ fprintf(stderr, "host list file requires an argument");
+ }
+ break;
case 'a':
if (i+1<argc) {
timeout = atoi(argv[i+1]);
void sigchld_handler(int s)
{
- while(wait(NULL) > 0);
+ int* status=NULL;
+ int i;
+ pid_t pid;
+
+ while((pid=wait(status)) > 0) {
+ if(WIFEXITED(status)) {
+ msg3(LOG_INFO, "Child exited with %d", WEXITSTATUS(status));
+ }
+ for(i=0;children[i]!=pid&&i<child_arraysize;i++);
+ if(i>=child_arraysize) {
+ msg3(LOG_INFO, "SIGCHLD received for an unknown child with PID %ld",(long) pid);
+ } else {
+ children[i]=(pid_t)0;
+ DEBUG2("Removing %d from the list of children", pid);
+ }
+ }
+}
+
+/* If we are terminated, make sure our children are, too. */
+void sigterm_handler(int s) {
+ int i;
+ int parent=0;
+
+ for(i=0;i<child_arraysize;i++) {
+ if(children[i]) {
+ kill(children[i], s);
+ parent=1;
+ }
+ }
+
+ if(parent) {
+ unlink(pidfname);
+ }
+
+ exit(0);
}
void connectme(int port)
struct sockaddr_in addrin;
struct sigaction sa;
int addrinlen = sizeof(addrin);
- int net, sock, newpid;
+ int net, sock, newpid, i;
#ifndef sun
int yes=1;
#else
char yes='1';
-#endif
+#endif /* sun */
+#ifndef NODAEMON
+#ifndef NOFORK
+ FILE*pidf;
+
+ if(port) {
+ if(daemon(0,0)<0) {
+ err("daemon");
+ }
+ snprintf(pidfname, sizeof(char)*255, "/var/run/nbd-server.%d.pid", port);
+ pidf=fopen(pidfname, "w");
+ if(pidf) {
+ fprintf(pidf,"%d", (int)getpid());
+ fclose(pidf);
+ } else {
+ perror("fopen");
+ fprintf(stderr, "Not fatal; continuing");
+ }
+ }
+#endif /* NOFORK */
+#endif /* NODAEMON */
if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
err("socket: %m");
/* lose the pesky "Address already in use" error message */
if (setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
- err("setsockopt");
+ err("setsockopt SO_REUSEADDR");
+ }
+ if (setsockopt(sock,SOL_SOCKET,SO_KEEPALIVE,&yes,sizeof(int)) == -1) {
+ err("setsockopt SO_KEEPALIVE");
}
DEBUG("Waiting for connections... bind, ");
sa.sa_flags = SA_RESTART;
if(sigaction(SIGCHLD, &sa, NULL) == -1)
err("sigaction: %m");
+ sa.sa_handler = sigterm_handler;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = SA_RESTART;
+ if(sigaction(SIGTERM, &sa, NULL) == -1)
+ err("sigaction: %m");
+ children=malloc(sizeof(pid_t)*child_arraysize);
+ memset(children, 0, sizeof(pid_t)*DEFAULT_CHILD_ARRAY);
for(;;) { /* infinite loop */
- if ((net = accept(sock, (struct sockaddr *) &addrin, &addrinlen)) < 0)
- err("accept: %m");
-
- set_peername(net,clientname) ;
- if (!authorized_client(clientname)) {
- msg2(LOG_INFO,"Unauthorized client") ;
- close(net) ;
- continue ;
- }
- msg2(LOG_INFO,"Authorized client") ;
- if ((newpid=fork())<0) {
- msg3(LOG_INFO,"Could not fork (%s)",strerror(errno)) ;
- close(net) ;
- continue ;
- }
- if (newpid>0) { /* parent */
- close(net) ; continue ; }
- /* child */
- close(sock) ;
- msg2(LOG_INFO,"Starting to serve") ;
- serveconnection(net) ;
+ if ((net = accept(sock, (struct sockaddr *) &addrin, &addrinlen)) < 0)
+ err("accept: %m");
+
+ set_peername(net,clientname) ;
+ if (!authorized_client(clientname)) {
+ msg2(LOG_INFO,"Unauthorized client") ;
+ close(net) ;
+ continue ;
+ }
+ msg2(LOG_INFO,"Authorized client") ;
+ for(i=0;children[i]&&i<child_arraysize;i++);
+ if(i>=child_arraysize) {
+ realloc(children, sizeof(pid_t)*child_arraysize);
+ memset(children+child_arraysize, 0, sizeof(pid_t)*DEFAULT_CHILD_ARRAY);
+ i=child_arraysize+1;
+ child_arraysize+=DEFAULT_CHILD_ARRAY;
+ }
+#ifndef NOFORK
+ if ((children[i]=fork())<0) {
+ msg3(LOG_INFO,"Could not fork (%s)",strerror(errno)) ;
+ close(net) ;
+ continue ;
+ }
+ if (children[i]>0) { /* parent */
+ close(net) ; continue ; }
+ /* child */
+ realloc(children,0);
+ child_arraysize=0;
+ close(sock) ;
+#endif // NOFORK
+ msg2(LOG_INFO,"Starting to serve") ;
+ serveconnection(net) ;
}
}
int rawexpread(off_t a, char *buf, int len)
{
- maybeseek(export[a/hunksize], a%hunksize);
- return (read(export[a/hunksize], buf, len) != len);
+ maybeseek(export[a/hunksize], a%hunksize);
+ return (read(export[a/hunksize], buf, len) != len);
}
int expread(off_t a, char *buf, int len)
struct nbd_reply reply;
char zeros[300];
int i = 0;
- off_t size_host;
+ u64 size_host;
memset(zeros, 0, 290);
if (write(net, INIT_PASSWD, 8) < 0)
cliserv_magic = htonll(cliserv_magic);
if (write(net, &cliserv_magic, sizeof(cliserv_magic)) < 0)
err("Negotiation failed: %m");
- size_host = htonll(exportsize);
+ size_host = htonll((u64)exportsize);
if (write(net, &size_host, 8) < 0)
err("Negotiation failed: %m");
if (write(net, zeros, 128) < 0)
#define BUFSIZE (1024*1024)
char buf[BUFSIZE];
int len;
-
#ifdef DODBG
i++;
printf("%d: ", i);
u32 es32;
struct stat stat_buf;
int error;
-
+
DEBUG("looking for export size with lseek SEEK_END\n");
es = lseek(export, (off_t)0, SEEK_END);
- if (es > ((off_t)0))
+ if (es > ((off_t)0)) {
return es;
-
+ } else {
+ DEBUG2("lseek failed: %d", errno==EBADF?1:(errno==ESPIPE?2:(errno==EINVAL?3:4)));
+ }
+
DEBUG("looking for export size with fstat\n");
stat_buf.st_size = 0;
error = fstat(export, &stat_buf);
- if (!error && stat_buf.st_size > 0)
+ if (!error && stat_buf.st_size > 0) {
return (off_t)stat_buf.st_size;
-
+ } else {
+ err("fstat failed: %m");
+ }
+
#ifdef BLKGETSIZE
DEBUG("looking for export size with ioctl BLKGETSIZE\n");
if (!ioctl(export, BLKGETSIZE, &es32) && es32) {
}
#endif
err("Could not find size of exported block device: %m");
- return (off_t)-1;
+ return OFFT_MAX;
}
int main(int argc, char *argv[])
void serveconnection(int net)
{
- off_t i ;
-
- for (i=0; i<exportsize; i+=hunksize) {
- char exportname3[1024];
-
- sprintf(exportname3, exportname2, i/hunksize);
- printf( "Opening %s\n", exportname3 );
- if ((export[i/hunksize] = open(exportname3, (flags & F_READONLY) ? O_RDONLY : O_RDWR)) == -1) {
- /* Read WRITE ACCESS was requested by media is only read only */
- autoreadonly = 1;
- flags |= F_READONLY;
- if ((export[i/hunksize] = open(exportname3, O_RDONLY)) == -1)
- err("Could not open exported file: %m");
+ off_t i ;
+
+ for (i=0; i<exportsize; i+=hunksize) {
+ char exportname3[1024];
+
+ sprintf(exportname3, exportname2, i/hunksize);
+ printf( "Opening %s\n", exportname3 );
+ if ((export[i/hunksize] = open(exportname3, (flags & F_READONLY) ? O_RDONLY : O_RDWR)) == -1) {
+ /* Read WRITE ACCESS was requested by media is only read only */
+ autoreadonly = 1;
+ flags |= F_READONLY;
+ if ((export[i/hunksize] = open(exportname3, O_RDONLY)) == -1)
+ err("Could not open exported file: %m");
+ }
}
- }
-
- if (exportsize == (off_t)OFFT_MAX) {
- exportsize = size_autodetect(export[0]);
- }
- if (exportsize > (off_t)OFFT_MAX) {
- err("Size of exported file is too big\n");
- }
- else
- msg3(LOG_INFO, "size of exported file/device is %Lu",
- (unsigned long long)exportsize);
-
- if (flags & F_COPYONWRITE) {
- sprintf(difffilename,"%s-%s-%d.diff",exportname2,clientname,
- (int)getpid()) ;
- msg3(LOG_INFO,"About to create map and diff file %s",difffilename) ;
- difffile=open(difffilename,O_RDWR | O_CREAT | O_TRUNC,0600) ;
- if (difffile<0) err("Could not create diff file (%m)") ;
- if ((difmap=calloc(exportsize/DIFFPAGESIZE,sizeof(u32)))==NULL)
- err("Could not allocate memory") ;
- for (i=0;i<exportsize/DIFFPAGESIZE;i++) difmap[i]=(u32)-1 ;
- }
-
- setmysockopt(net);
-
- mainloop(net);
+
+ if (exportsize == (off_t)OFFT_MAX) {
+ exportsize = size_autodetect(export[0]);
+ }
+ if (exportsize > (off_t)OFFT_MAX) {
+ err("Size of exported file is too big\n");
+ }
+ else
+ msg3(LOG_INFO, "size of exported file/device is %Lu",
+ (unsigned long long)exportsize);
+
+ if (flags & F_COPYONWRITE) {
+ sprintf(difffilename,"%s-%s-%d.diff",exportname2,clientname,
+ (int)getpid()) ;
+ msg3(LOG_INFO,"About to create map and diff file %s",difffilename) ;
+ difffile=open(difffilename,O_RDWR | O_CREAT | O_TRUNC,0600) ;
+ if (difffile<0) err("Could not create diff file (%m)") ;
+ if ((difmap=calloc(exportsize/DIFFPAGESIZE,sizeof(u32)))==NULL)
+ err("Could not allocate memory") ;
+ for (i=0;i<exportsize/DIFFPAGESIZE;i++) difmap[i]=(u32)-1 ;
+ }
+
+ setmysockopt(net);
+
+ mainloop(net);
}
projects / nbd.git / blobdiff