/*
 * Copyright (C) 2004-2006, 2008  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1996, 1998-2001, 2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC 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.
 */

#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 > 0U) {
                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;

        if (buffer == NULL)
                return (NULL);

        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
 *      structure. 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);
        (void) vsprintf(buffer, fmt, ap);
        todo = strlen(buffer);
        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);
}




/*! \file */