ref: 52cacba37c6f3a125ef931afa4b9c2cdb7438fef
dir: /sys/src/cmd/ip/httpd/netlib_history.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include "httpd.h"
#include "httpsrv.h"
Hio *HO;
int diffb;
enum{ DAY = 24*60*60 };
void
lastbefore(ulong t, char *f, char *b)
{
Tm *tm;
Dir *dir;
int try;
ulong t0, mtime;
t0 = t;
for(try=0; try<10; try++) {
tm = localtime(t);
t -= DAY;
sprint(b,"%.4d/%.2d%.2d/netlib/pub/%s",tm->year+1900,tm->mon+1,tm->mday,f);
dir = dirstat(b);
if(dir == nil)
continue;
mtime = dir->mtime;
free(dir);
if(mtime > t0)
continue;
return;
}
strcpy(b, "filenotfound");
}
// create explicit file for diff, which otherwise would create a
// mode 0600 file that it couldn't read (because running as none)
void
gunzip(char *f, char *tmp)
{
int fd = open(tmp, OWRITE);
if(fd < 0) // can't happen
return;
switch(fork()){
case 0:
dup(fd, 1);
close(fd);
close(0);
execl("/bin/gunzip", "gunzip", "-c", f, nil);
hprint(HO, "can't exec gunzip: %r\n");
break;
case -1:
hprint(HO, "fork failed: %r\n");
default:
while(waitpid() != -1)
;
break;
}
close(fd);
}
void
netlibhistory(char *file)
{
char buf[500], pair[2][500], tmpf[2][30], *f;
int toggle = 0, started = 0, limit;
Dir *dir;
ulong otime, dt;
int i, fd, tmpcnt;
if(strncmp(file, "../", 3) == 0 || strstr(file, "/../") ||
strlen(file) >= sizeof(buf) - strlen("1997/0204/netlib/pub/0"))
return;
limit = 50;
if(diffb){
limit = 10;
// create two tmp files for gunzip
for(i = 0, tmpcnt = 0; i < 2 && tmpcnt < 20; tmpcnt++){
snprint(tmpf[i], sizeof(tmpf[0]), "/tmp/d%x", tmpcnt);
if(access(buf, AEXIST) == 0)
continue;
fd = create(tmpf[i], OWRITE, 0666);
if(fd < 0)
goto done;
close(fd);
i++;
}
}
otime = time(0);
hprint(HO,"<UL>\n");
while(limit--){
lastbefore(otime, file, buf);
dir = dirstat(buf);
if(dir == nil)
goto done;
dt = DAY/2;
while(otime <= dir->mtime){
lastbefore(otime-dt, file, buf);
free(dir);
dir = dirstat(buf);
if(dir == nil)
goto done;
dt += DAY/2;
}
f = pair[toggle];
strcpy(f, buf);
if(diffb && strcmp(f+strlen(f)-3, ".gz") == 0){
gunzip(f, tmpf[toggle]);
strcpy(f, tmpf[toggle]);
}
if(diffb && started){
hprint(HO, "<PRE>\n");
hflush(HO);
switch(fork()){
case 0:
execl("/bin/diff", "diff", "-nb",
pair[1-toggle], pair[toggle], nil);
hprint(HO, "can't exec diff: %r\n");
break;
case -1:
hprint(HO, "fork failed: %r\n");
break;
default:
while(waitpid() != -1)
;
break;
}
hprint(HO, "</PRE>\n");
}
hprint(HO,"<LI><A HREF=\"/historic/%s\">%s</A> %lld bytes\n",
buf, 4+asctime(gmtime(dir->mtime)), dir->length);
if(diffb)
hprint(HO," <FONT SIZE=-1>(%s)</FONT>\n", pair[toggle]);
toggle = 1-toggle;
started = 1;
otime = dir->mtime;
free(dir);
}
hprint(HO,"<LI>...\n");
done:
hprint(HO,"</UL>\n");
if(diffb){
remove(tmpf[0]);
remove(tmpf[1]);
}
}
int
send(HConnect *c)
{
char *file, *s;
HSPairs *q;
if(strcmp(c->req.meth, "GET") != 0 && strcmp(c->req.meth, "HEAD") != 0)
return hunallowed(c, "GET, HEAD");
if(c->head.expectother || c->head.expectcont)
return hfail(c, HExpectFail, nil);
if(c->req.search == nil || !*c->req.search)
return hfail(c, HNoData, "netlib_history");
s = c->req.search;
while((s = strchr(s, '+')) != nil)
*s++ = ' ';
file = nil;
for(q = hparsequery(c, hstrdup(c, c->req.search)); q; q = q->next){
if(strcmp(q->s, "file") == 0)
file = q->t;
else if(strcmp(q->s, "diff") == 0)
diffb = 1;
}
if(file == nil)
return hfail(c, HNoData, "netlib_history missing file field");
logit(c, "netlib_hist %s%s", file, diffb?" DIFF":"");
if(c->req.vermaj){
hokheaders(c);
hprint(HO, "Content-type: text/html\r\n");
hprint(HO, "\r\n");
}
if(strcmp(c->req.meth, "HEAD") == 0){
writelog(c, "Reply: 200 netlib_history 0\n");
hflush(HO);
exits(nil);
}
hprint(HO, "<HEAD><TITLE>%s history</TITLE></HEAD>\n<BODY>\n",file);
hprint(HO, "<H2>%s history</H2>\n",file);
hprint(HO, "<I>Netlib's copy of %s was changed\n", file);
hprint(HO, "on the dates shown. <BR>Click on the date link\n");
hprint(HO, "to retrieve the corresponding version.</I>\n");
if(diffb){
hprint(HO, "<BR><I>Lines beginning with < are for the\n");
hprint(HO, "newer of the two versions.</I>\n");
}
if(chdir("/usr/web/historic") < 0)
hprint(HO, "chdir failed: %r\n");
netlibhistory(file);
hprint(HO, "<BR><A HREF=\"http://cm.bell-labs.com/who/ehg\">Eric Grosse</A>\n");
hprint(HO, "</BODY></HTML>\n");
hflush(HO);
writelog(c, "Reply: 200 netlib_history %ld %ld\n", HO->seek, HO->seek);
return 1;
}
void
main(int argc, char **argv)
{
HConnect *c;
c = init(argc, argv);
HO = &c->hout;
if(hparseheaders(c, HSTIMEOUT) >= 0)
send(c);
exits(nil);
}