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/* ISC license. */
#include <sys/uio.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <signal.h>
#include <regex.h>
#include <skalibs/posixplz.h>
#include <skalibs/types.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/error.h>
#include <skalibs/strerr.h>
#include <skalibs/buffer.h>
#include <skalibs/stralloc.h>
#include <skalibs/genalloc.h>
#include <skalibs/sig.h>
#include <skalibs/tai.h>
#include <skalibs/djbunix.h>
#include <skalibs/iopause.h>
#include <skalibs/textmessage.h>
#include <skalibs/textclient.h>
#include "ftrig1.h"
#include <s6/ftrigr.h>
#include <skalibs/posixishard.h>
#define FTRIGRD_MAXREADS 32
#define FTRIGRD_BUFSIZE 16
#define dienomem() strerr_diefu1sys(111, "stralloc_catb")
typedef struct ftrigio_s ftrigio, *ftrigio_ref ;
struct ftrigio_s
{
unsigned int xindex ;
ftrig1_t trig ;
buffer b ;
char buf[FTRIGRD_BUFSIZE] ;
regex_t re ;
stralloc sa ;
uint32_t options ;
uint16_t id ; /* given by client */
} ;
#define FTRIGIO_ZERO { .xindex = 0, .trig = FTRIG1_ZERO, .b = BUFFER_INIT(0, -1, 0, 0), .buf = "", .sa = STRALLOC_ZERO, .options = 0, .id = 0 }
static genalloc g = GENALLOC_ZERO ; /* ftrigio */
static void trig (uint16_t id, char what, char info)
{
char pack[4] ;
uint16_pack_big(pack, id) ;
pack[2] = what ; pack[3] = info ;
if (!textmessage_put(textmessage_sender_x, pack, 4))
strerr_diefu1sys(111, "build answer") ;
}
static void answer (unsigned char c)
{
if (!textmessage_put(textmessage_sender_1, (char *)&c, 1))
strerr_diefu1sys(111, "textmessage_put") ;
}
static void ftrigio_deepfree (ftrigio *p)
{
ftrig1_free(&p->trig) ;
stralloc_free(&p->sa) ;
regfree(&p->re) ;
}
static void remove (size_t i)
{
size_t n = genalloc_len(ftrigio, &g) ;
ftrigio *a = genalloc_s(ftrigio, &g) ;
ftrigio_deepfree(a + i) ;
a[i] = a[--n] ;
a[i].b.c.x = a[i].buf ;
genalloc_setlen(ftrigio, &g, n) ;
}
static inline int ftrigio_read (ftrigio *p)
{
unsigned int i = FTRIGRD_MAXREADS ;
while (i--)
{
regmatch_t pmatch ;
size_t blen ;
ssize_t r = sanitize_read(buffer_fill(&p->b)) ;
if (!r) break ;
if (r < 0) return (trig(p->id, 'd', errno), 0) ;
blen = buffer_len(&p->b) ;
if (!stralloc_readyplus(&p->sa, blen+1)) dienomem() ;
buffer_getnofill(&p->b, p->sa.s + p->sa.len, blen) ;
p->sa.len += blen ;
p->sa.s[p->sa.len] = 0 ;
while (!regexec(&p->re, p->sa.s, 1, &pmatch, REG_NOTBOL | REG_NOTEOL))
{
trig(p->id, '!', p->sa.s[pmatch.rm_eo - 1]) ;
if (!(p->options & FTRIGR_REPEAT)) return 0 ;
memmove(p->sa.s, p->sa.s + pmatch.rm_eo, p->sa.len + 1 - pmatch.rm_eo) ;
p->sa.len -= pmatch.rm_eo ;
}
}
return 1 ;
}
static int parse_protocol (struct iovec const *v, void *context)
{
char const *s = v->iov_base ;
uint16_t id ;
if (v->iov_len < 3)
strerr_dief1x(100, "invalid client request") ;
uint16_unpack_big(s, &id) ;
switch (s[2])
{
case 'U' : /* unsubscribe */
{
size_t n = genalloc_len(ftrigio, &g) ;
size_t i = 0 ;
for (; i < n ; i++) if (genalloc_s(ftrigio, &g)[i].id == id) break ;
if (i < n)
{
remove(i) ;
answer(0) ;
}
else answer(EINVAL) ;
break ;
}
case 'L' : /* subscribe to path and match re */
{
size_t n = genalloc_len(ftrigio, &g) ;
ftrigio *p ;
uint32_t options, pathlen, relen ;
int r ;
if (v->iov_len < 19)
{
answer(EPROTO) ;
break ;
}
uint32_unpack_big(s + 3, &options) ;
uint32_unpack_big(s + 7, &pathlen) ;
uint32_unpack_big(s + 11, &relen) ;
if (((pathlen + relen + 17) != v->iov_len) || s[15 + pathlen] || s[v->iov_len - 1])
{
answer(EPROTO) ;
break ;
}
if (!genalloc_readyplus(ftrigio, &g, 1))
{
answer(ENOMEM) ;
break ;
}
p = genalloc_s(ftrigio, &g) + n ;
r = skalibs_regcomp(&p->re, s + 16 + pathlen, REG_EXTENDED) ;
if (r)
{
answer(r == REG_ESPACE ? ENOMEM : EINVAL) ;
break ;
}
if (!ftrig1_make(&p->trig, s + 15))
{
regfree(&p->re) ;
answer(errno) ;
break ;
}
buffer_init(&p->b, &buffer_read, p->trig.fd, p->buf, FTRIGRD_BUFSIZE) ;
p->options = options ;
p->id = id ;
p->sa = stralloc_zero ;
genalloc_setlen(ftrigio, &g, n+1) ;
answer(0) ;
break ;
}
default :
strerr_dief1x(100, "invalid client request") ;
}
(void)context ;
return 1 ;
}
int main (void)
{
PROG = "s6-ftrigrd" ;
if (ndelay_on(0) == -1 || ndelay_on(1) == -1)
strerr_diefu1sys(111, "make fds nonblocking") ;
if (!sig_altignore(SIGPIPE))
strerr_diefu1sys(111, "ignore SIGPIPE") ;
{
tain deadline ;
tain_now_set_stopwatch_g() ;
tain_addsec_g(&deadline, 2) ;
if (!textclient_server_01x_init_g(FTRIGR_BANNER1, FTRIGR_BANNER1_LEN, FTRIGR_BANNER2, FTRIGR_BANNER2_LEN, &deadline))
strerr_diefu1sys(111, "sync with client") ;
}
for (;;)
{
size_t n = genalloc_len(ftrigio, &g) ;
size_t i = 0 ;
iopause_fd x[3 + n] ;
x[0].fd = 0 ; x[0].events = IOPAUSE_EXCEPT | IOPAUSE_READ ;
x[1].fd = 1 ; x[1].events = IOPAUSE_EXCEPT | (textmessage_sender_isempty(textmessage_sender_1) ? 0 : IOPAUSE_WRITE) ;
x[2].fd = textmessage_sender_fd(textmessage_sender_x) ;
x[2].events = IOPAUSE_EXCEPT | (textmessage_sender_isempty(textmessage_sender_x) ? 0 : IOPAUSE_WRITE) ;
for (; i < n ; i++)
{
ftrigio *p = genalloc_s(ftrigio, &g) + i ;
p->xindex = 3+i ;
x[3+i].fd = p->trig.fd ;
x[3+i].events = IOPAUSE_READ ;
}
if (iopause(x, 3 + n, 0, 0) < 0)
strerr_diefu1sys(111, "iopause") ;
/* client closed */
if ((x[0].revents | x[1].revents) & IOPAUSE_EXCEPT) break ;
/* client is reading */
if (x[1].revents & IOPAUSE_WRITE)
if (!textmessage_sender_flush(textmessage_sender_1) && !error_isagain(errno))
strerr_diefu1sys(111, "flush stdout") ;
if (x[2].revents & IOPAUSE_WRITE)
if (!textmessage_sender_flush(textmessage_sender_x) && !error_isagain(errno))
return 1 ;
/* scan listening ftrigs */
for (i = 0 ; i < genalloc_len(ftrigio, &g) ; i++)
{
ftrigio *p = genalloc_s(ftrigio, &g) + i ;
if (x[p->xindex].revents & IOPAUSE_READ)
if (!ftrigio_read(p)) remove(i--) ;
}
/* client is writing */
if (!textmessage_receiver_isempty(textmessage_receiver_0) || x[0].revents & IOPAUSE_READ)
{
if (textmessage_handle(textmessage_receiver_0, &parse_protocol, 0) < 0)
{
if (errno == EPIPE) break ; /* normal exit */
strerr_diefu1sys(111, "handle messages from client") ;
}
}
}
return 0 ;
}
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