/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <bio.h>#include <auth.h>#include <fcall.h> #pragma	varargck	type	"P"	char* int	nsrv;Dir	*srv;Biobuf	stdout; typedef struct Mount Mount; struct Mount{	char	*cmd;	char	*flag;	char	*new;	char	*old;	char	*spec;}; void	xlatemnt(Mount*);char	*quote(char*); int	rflag; voidusage(void){	fprint(2, "usage: ns [-r] [pid]\n");	exits("usage");} voidmain(int argc, char **argv){	Mount *m;	int line, fd, n, pid;	char buf[1024], *av[5]; 	ARGBEGIN{	case 'r':		rflag++;		break;	default:		usage();	}ARGEND 	if(argc > 1)		usage();	if(argc == 1){		pid = atoi(argv[0]);		if(pid == 0)			usage();	}else		pid = getpid(); 	Binit(&stdout, 1, OWRITE); 	sprint(buf, "/proc/%d/ns", pid);	fd = open(buf, OREAD);	if(fd < 0) {		fprint(2, "ns: open %s: %r\n", buf);		exits("open ns");	} 	for(line=1; ; line++) {		n = read(fd, buf, sizeof(buf));		if(n == sizeof(buf)) {			fprint(2, "ns: ns string too long\n");			exits("read ns");		}		if(n < 0) {			fprint(2, "ns: read %r\n");			exits("read ns");		}		if(n == 0)			break;		buf[n] = '\0'; 		m = mallocz(sizeof(Mount), 1);		if(m == nil) {			fprint(2, "ns: no memory: %r\n");			exits("no memory");		} 		n = tokenize(buf, av, 5);		switch(n){		case 2:			if(strcmp(av[0], "cd") == 0){				Bprint(&stdout, "%s %s\n", av[0], av[1]);				continue;			}			/* fall through */		default:			fprint(2, "ns: unrecognized format of ns file: %d elements on line %d\n", n, line);			exits("format");		case 5:			m->cmd = strdup(av[0]);			m->flag = strdup(av[1]);			m->new = strdup(av[2]);			m->old = strdup(av[3]);			m->spec = strdup(av[4]);			break;		case 4:			if(av[1][0] == '-'){				m->cmd = strdup(av[0]);				m->flag = strdup(av[1]);				m->new = strdup(av[2]);				m->old = strdup(av[3]);				m->spec = strdup("");			}else{				m->cmd = strdup(av[0]);				m->flag = strdup("");				m->new = strdup(av[1]);				m->old = strdup(av[2]);				m->spec = strdup(av[3]);			}			break;		case 3:			m->cmd = strdup(av[0]);			m->flag = strdup("");			m->new = strdup(av[1]);			m->old = strdup(av[2]);			m->spec = strdup("");			break;		} 		if(!rflag && strcmp(m->cmd, "mount")==0)			xlatemnt(m); 		Bprint(&stdout, "%s %s %s %s %s\n", m->cmd, m->flag,			quote(m->new), quote(m->old), quote(m->spec)); 		free(m->cmd);		free(m->flag);		free(m->new);		free(m->old);		free(m->spec);		free(m);	} 	exits(nil);} voidxlatemnt(Mount *m){	int n, fd;	char *s, *t, *net, *port;	char buf[256]; 	if(strncmp(m->new, "/net/", 5) != 0)		return; 	s = strdup(m->new);	net = s+5;	for(t=net; *t!='/'; t++)		if(*t == '\0')			goto Return;	*t = '\0';	port = t+1;	for(t=port; *t!='/'; t++)		if(*t == '\0')			goto Return;	*t = '\0';	if(strcmp(t+1, "data") != 0)		goto Return;	snprint(buf, sizeof buf, "/net/%s/%s/remote", net, port);	fd = open(buf, OREAD);	if(fd < 0)		goto Return;	n = read(fd, buf, sizeof buf);	close(fd);	if(n<=1 || n>sizeof buf)		goto Return;	if(buf[n-1] == '\n')		--n;	buf[n] = '\0';	t = malloc(strlen(net)+1+n+1);	if(t == nil)		goto Return;	sprint(t, "%s!%s", net, buf);	free(m->new);	m->new = t; Return:		free(s);} char*quote(char *s){	static char buf[3][1024];	static int i;	char *p, *ep; 	if(strpbrk(s, " '\\\t#$") == nil)		return s;	i = (i+1)%3;	p = &buf[i][0];	ep = &buf[i][1024];	*p++ = '\'';	while(p < ep-5){		switch(*s){		case '\0':			goto out;		case '\'':			*p++ = '\'';			break;		}		*p++ = *s++;	}    out:	*p++ = '\'';	*p = '\0';	return buf[i];}