NetBSD/dist/bind/lib/irs/irp.c

595 lines
11 KiB
C

/* $NetBSD: irp.c,v 1.4 2002/06/20 11:43:04 itojun Exp $ */
/*
* Copyright (c) 1996, 1998 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
#if !defined(LINT) && !defined(CODECENTER)
static const char rcsid[] = "Id: irp.c,v 8.8 2001/09/25 04:50:29 marka Exp";
#endif
/* Imports */
#include "port_before.h"
#include <syslog.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stdarg.h>
#include <fcntl.h>
#include <syslog.h>
#include <ctype.h>
#include <unistd.h>
#include <isc/memcluster.h>
#include <irs.h>
#include <irp.h>
#include "irs_p.h"
#include "irp_p.h"
#include "port_after.h"
/* Forward. */
static void irp_close(struct irs_acc *);
#define LINEINCR 128
#if !defined(SUN_LEN)
#define SUN_LEN(su) \
(sizeof (*(su)) - sizeof ((su)->sun_path) + strlen((su)->sun_path))
#endif
/* Public */
/* send errors to syslog if true. */
int irp_log_errors = 1;
/*
* This module handles the irp module connection to irpd.
*
* The client expects a synchronous interface to functions like
* getpwnam(3), so we can't use the ctl_* i/o library on this end of
* the wire (it's used in the server).
*/
/*
* irs_acc *irs_irp_acc(const char *options);
*
* Initialize the irp module.
*/
struct irs_acc *
irs_irp_acc(const char *options) {
struct irs_acc *acc;
struct irp_p *irp;
UNUSED(options);
if (!(acc = memget(sizeof *acc))) {
errno = ENOMEM;
return (NULL);
}
memset(acc, 0x5e, sizeof *acc);
if (!(irp = memget(sizeof *irp))) {
errno = ENOMEM;
free(acc);
return (NULL);
}
irp->inlast = 0;
irp->incurr = 0;
irp->fdCxn = -1;
acc->private = irp;
#ifdef WANT_IRS_GR
acc->gr_map = irs_irp_gr;
#else
acc->gr_map = NULL;
#endif
#ifdef WANT_IRS_PW
acc->pw_map = irs_irp_pw;
#else
acc->pw_map = NULL;
#endif
acc->sv_map = irs_irp_sv;
acc->pr_map = irs_irp_pr;
acc->ho_map = irs_irp_ho;
acc->nw_map = irs_irp_nw;
acc->ng_map = irs_irp_ng;
acc->close = irp_close;
return (acc);
}
int
irs_irp_connection_setup(struct irp_p *cxndata, int *warned) {
if (irs_irp_is_connected(cxndata)) {
return (0);
} else if (irs_irp_connect(cxndata) != 0) {
if (warned != NULL && !*warned) {
syslog(LOG_ERR, "irpd connection failed: %m\n");
(*warned)++;
}
return (-1);
}
return (0);
}
/*
* int irs_irp_connect(void);
*
* Sets up the connection to the remote irpd server.
*
* Returns:
*
* 0 on success, -1 on failure.
*
*/
int
irs_irp_connect(struct irp_p *pvt) {
int flags;
struct sockaddr *addr;
struct sockaddr_in iaddr;
#ifndef NO_SOCKADDR_UN
struct sockaddr_un uaddr;
#endif
long ipaddr;
const char *irphost;
int code;
char text[256];
int socklen = 0;
if (pvt->fdCxn != -1) {
perror("fd != 1");
return (-1);
}
#ifndef NO_SOCKADDR_UN
memset(&uaddr, 0, sizeof uaddr);
#endif
memset(&iaddr, 0, sizeof iaddr);
irphost = getenv(IRPD_HOST_ENV);
if (irphost == NULL) {
irphost = "127.0.0.1";
}
#ifndef NO_SOCKADDR_UN
if (irphost[0] == '/') {
addr = (struct sockaddr *)&uaddr;
strncpy(uaddr.sun_path, irphost, sizeof uaddr.sun_path);
uaddr.sun_family = AF_UNIX;
socklen = SUN_LEN(&uaddr);
#ifdef HAVE_SA_LEN
uaddr.sun_len = socklen;
#endif
} else
#endif
{
if (inet_pton(AF_INET, irphost, &ipaddr) != 1) {
errno = EADDRNOTAVAIL;
perror("inet_pton");
return (-1);
}
addr = (struct sockaddr *)&iaddr;
socklen = sizeof iaddr;
#ifdef HAVE_SA_LEN
iaddr.sin_len = socklen;
#endif
iaddr.sin_family = AF_INET;
iaddr.sin_port = htons(IRPD_PORT);
iaddr.sin_addr.s_addr = ipaddr;
}
pvt->fdCxn = socket(addr->sa_family, SOCK_STREAM, PF_UNSPEC);
if (pvt->fdCxn < 0) {
perror("socket");
return (-1);
}
if (connect(pvt->fdCxn, addr, socklen) != 0) {
perror("connect");
return (-1);
}
flags = fcntl(pvt->fdCxn, F_GETFL, 0);
if (flags < 0) {
close(pvt->fdCxn);
perror("close");
return (-1);
}
#if 0
flags |= O_NONBLOCK;
if (fcntl(pvt->fdCxn, F_SETFL, flags) < 0) {
close(pvt->fdCxn);
perror("fcntl");
return (-1);
}
#endif
code = irs_irp_read_response(pvt, text, sizeof text);
if (code != IRPD_WELCOME_CODE) {
if (irp_log_errors) {
syslog(LOG_WARNING, "Connection failed: %s", text);
}
irs_irp_disconnect(pvt);
return (-1);
}
return (0);
}
/*
* int irs_irp_is_connected(struct irp_p *pvt);
*
* Returns:
*
* Non-zero if streams are setup to remote.
*
*/
int
irs_irp_is_connected(struct irp_p *pvt) {
return (pvt->fdCxn >= 0);
}
/*
* void
* irs_irp_disconnect(struct irp_p *pvt);
*
* Closes streams to remote.
*/
void
irs_irp_disconnect(struct irp_p *pvt) {
if (pvt->fdCxn != -1) {
close(pvt->fdCxn);
pvt->fdCxn = -1;
}
}
int
irs_irp_read_line(struct irp_p *pvt, char *buffer, int len) {
char *realstart = &pvt->inbuffer[0];
char *p, *start, *end;
int spare;
int i;
int buffpos = 0;
int left = len - 1;
while (left > 0) {
start = p = &pvt->inbuffer[pvt->incurr];
end = &pvt->inbuffer[pvt->inlast];
while (p != end && *p != '\n')
p++;
if (p == end) {
/* Found no newline so shift data down if necessary
* and append new data to buffer
*/
if (start > realstart) {
memmove(realstart, start, end - start);
pvt->inlast = end - start;
start = realstart;
pvt->incurr = 0;
end = &pvt->inbuffer[pvt->inlast];
}
spare = sizeof (pvt->inbuffer) - pvt->inlast;
p = end;
i = read(pvt->fdCxn, end, spare);
if (i < 0) {
close(pvt->fdCxn);
pvt->fdCxn = -1;
return (buffpos > 0 ? buffpos : -1);
} else if (i == 0) {
return (buffpos);
}
end += i;
pvt->inlast += i;
while (p != end && *p != '\n')
p++;
}
if (p == end) {
/* full buffer and still no newline */
i = sizeof pvt->inbuffer;
} else {
/* include newline */
i = p - start + 1;
}
if (i > left)
i = left;
memcpy(buffer + buffpos, start, i);
pvt->incurr += i;
buffpos += i;
buffer[buffpos] = '\0';
if (p != end) {
left = 0;
} else {
left -= i;
}
}
#if 0
fprintf(stderr, "read line: %s\n", buffer);
#endif
return (buffpos);
}
/*
* int irp_read_response(struct irp_p *pvt);
*
* Returns:
*
* The number found at the beginning of the line read from
* FP. 0 on failure(0 is not a legal response code). The
* rest of the line is discarded.
*
*/
int
irs_irp_read_response(struct irp_p *pvt, char *text, size_t textlen) {
char line[1024];
int code;
char *p;
if (irs_irp_read_line(pvt, line, sizeof line) <= 0) {
return (0);
}
p = strchr(line, '\n');
if (p == NULL) {
return (0);
}
if (sscanf(line, "%d", &code) != 1) {
code = 0;
} else if (text != NULL && textlen > 0) {
p = line;
while (isspace((unsigned char)*p)) p++;
while (isdigit((unsigned char)*p)) p++;
while (isspace((unsigned char)*p)) p++;
strncpy(text, p, textlen - 1);
p[textlen - 1] = '\0';
}
return (code);
}
/*
* char *irp_read_body(struct irp_p *pvt, size_t *size);
*
* Read in the body of a response. Terminated by a line with
* just a dot on it. Lines should be terminated with a CR-LF
* sequence, but we're nt piccky if the CR is missing.
* No leading dot escaping is done as the protcol doesn't
* use leading dots anywhere.
*
* Returns:
*
* Pointer to null-terminated buffer allocated by memget.
* *SIZE is set to the length of the buffer.
*
*/
char *
irs_irp_read_body(struct irp_p *pvt, size_t *size) {
char line[1024];
u_int linelen;
size_t len = LINEINCR;
char *buffer = memget(len);
int idx = 0;
for (;;) {
if (irs_irp_read_line(pvt, line, sizeof line) <= 0 ||
strchr(line, '\n') == NULL)
goto death;
linelen = strlen(line);
if (line[linelen - 1] != '\n')
goto death;
/* We're not strict about missing \r. Should we be?? */
if (linelen > 2 && line[linelen - 2] == '\r') {
line[linelen - 2] = '\n';
line[linelen - 1] = '\0';
linelen--;
}
if (linelen == 2 && line[0] == '.') {
*size = len;
buffer[idx] = '\0';
return (buffer);
}
if (linelen > (len - (idx + 1))) {
char *p = memget(len + LINEINCR);
if (p == NULL)
goto death;
memcpy(p, buffer, len);
memput(buffer, len);
buffer = p;
len += LINEINCR;
}
memcpy(buffer + idx, line, linelen);
idx += linelen;
}
death:
memput(buffer, len);
return (NULL);
}
/*
* int irs_irp_get_full_response(struct irp_p *pvt, int *code,
* char **body, size_t *bodylen);
*
* Gets the response to a command. If the response indicates
* there's a body to follow(code % 10 == 1), then the
* body buffer is allcoated with memget and stored in
* *BODY. The length of the allocated body buffer is stored
* in *BODY. The caller must give the body buffer back to
* memput when done. The results code is stored in *CODE.
*
* Returns:
*
* 0 if a result was read. -1 on some sort of failure.
*
*/
int
irs_irp_get_full_response(struct irp_p *pvt, int *code, char *text,
size_t textlen, char **body, size_t *bodylen) {
int result = irs_irp_read_response(pvt, text, textlen);
*body = NULL;
if (result == 0) {
return (-1);
}
*code = result;
/* Code that matches 2xx is a good result code.
* Code that matches xx1 means there's a response body coming.
*/
if ((result / 100) == 2 && (result % 10) == 1) {
*body = irs_irp_read_body(pvt, bodylen);
if (*body == NULL) {
return (-1);
}
}
return (0);
}
/*
* int irs_irp_send_command(struct irp_p *pvt, const char *fmt, ...);
*
* Sends command to remote connected via the PVT
* struture. FMT and args after it are fprintf-like
* arguments for formatting.
*
* Returns:
*
* 0 on success, -1 on failure.
*/
int
irs_irp_send_command(struct irp_p *pvt, const char *fmt, ...) {
va_list ap;
char buffer[1024];
int pos = 0;
int i, todo;
if (pvt->fdCxn < 0) {
return (-1);
}
va_start(ap, fmt);
todo = vsprintf(buffer, fmt, ap);
va_end(ap);
if (todo > (int)sizeof(buffer) - 3) {
syslog(LOG_CRIT, "memory overrun in irs_irp_send_command()");
exit(1);
}
strcat(buffer, "\r\n");
todo = strlen(buffer);
while (todo > 0) {
i = write(pvt->fdCxn, buffer + pos, todo);
#if 0
/* XXX brister */
fprintf(stderr, "Wrote: \"");
fwrite(buffer + pos, sizeof (char), todo, stderr);
fprintf(stderr, "\"\n");
#endif
if (i < 0) {
close(pvt->fdCxn);
pvt->fdCxn = -1;
return (-1);
}
todo -= i;
}
return (0);
}
/* Methods */
/*
* void irp_close(struct irs_acc *this)
*
*/
static void
irp_close(struct irs_acc *this) {
struct irp_p *irp = (struct irp_p *)this->private;
if (irp != NULL) {
irs_irp_disconnect(irp);
memput(irp, sizeof *irp);
}
memput(this, sizeof *this);
}