path: root/mbbsd/record.c

/* $Id$ */
#include "bbs.h"

#undef  HAVE_MMAP
#define BUFSIZE 512

static void
PttLock(int fd, int size, int mode)
{
    static struct flock lock_it;
    int             ret;

    lock_it.l_whence = SEEK_CUR;/* from current point */
    lock_it.l_start = 0;    /* -"- */
    lock_it.l_len = size;   /* length of data */
    lock_it.l_type = mode;  /* set exclusive/write lock */
    lock_it.l_pid = 0;      /* pid not actually interesting */
    while ((ret = fcntl(fd, F_SETLKW, &lock_it)) < 0 && errno == EINTR);
}

#define safewrite       write

int
get_num_records(char *fpath, int size)
{
    struct stat     st;
    if (stat(fpath, &st) == -1)
    return 0;
    return st.st_size / size;
}

int
get_sum_records(char *fpath, int size)
{
    struct stat     st;
    long            ans = 0;
    FILE           *fp;
    fileheader_t    fhdr;
    char            buf[200], *p;

    if (!(fp = fopen(fpath, "r")))
    return -1;

    strlcpy(buf, fpath, sizeof(buf));
    p = strrchr(buf, '/');
    assert(p);
    p++;

    while (fread(&fhdr, size, 1, fp) == 1) {
    strcpy(p, fhdr.filename);
    if (stat(buf, &st) == 0 && S_ISREG(st.st_mode) && st.st_nlink == 1)
        ans += st.st_size;
    }
    fclose(fp);
    return ans / 1024;
}

int
get_record_keep(char *fpath, void *rptr, int size, int id, int *fd)
{
    /* 和 get_record() 一樣. 不過藉由 *fd, 可使同一個檔案不要一直重複開關 */
    if (id >= 1 &&
    (*fd > 0 ||
     ((*fd = open(fpath, O_RDONLY, 0)) > 0))){
    if (lseek(*fd, (off_t) (size * (id - 1)), SEEK_SET) != -1) {
        if (read(*fd, rptr, size) == size) {
        return 0;
        }
    }
    }
    return -1;
}

int
get_record(char *fpath, void *rptr, int size, int id)
{
    int             fd = -1;

    if (id >= 1 && (fd = open(fpath, O_RDONLY, 0)) != -1) {
    if (lseek(fd, (off_t) (size * (id - 1)), SEEK_SET) != -1) {
        if (read(fd, rptr, size) == size) {
        close(fd);
        return 0;
        }
    }
    close(fd);
    }
    return -1;
}

int
get_records(char *fpath, void *rptr, int size, int id, int number)
{
    int             fd;

    if (id < 1 || (fd = open(fpath, O_RDONLY, 0)) == -1)
    return -1;

    if( flock(fd, LOCK_EX) < 0 ){
        close(fd);
        return -1;
    }

    if (lseek(fd, (off_t) (size * (id - 1)), SEEK_SET) == -1) {
    close(fd);
    return 0;
    }
    if ((id = read(fd, rptr, size * number)) == -1) {
    close(fd);
    return -1;
    }
    close(fd);
    return id / size;
}

int
lock_substitute_record(char *fpath, void *rptr, int size, int id, int mode)
{
    static  int     fd = -1;
    switch( mode ){
    case LOCK_EX:
    if( id < 1 || (fd = open(fpath, O_RDWR | O_CREAT, 0644)) == -1 )
        return -1;

    if( flock(fd, LOCK_EX) < 0 ){
        close(fd);
        return -1;
    }
    lseek(fd, (off_t) (size * (id - 1)), SEEK_SET);
    read(fd, rptr, size);
    return 0;

    case LOCK_UN:
    if( fd < 0 )
        return -1;
    lseek(fd, (off_t) (size * (id - 1)), SEEK_SET);
    write(fd, rptr, size);
    flock(fd, LOCK_UN);
    close(fd);
    fd = -1;
    return 0;

    default:
    return -1;
    }
}

int
substitute_record(char *fpath, void *rptr, int size, int id)
{
    int             fd;

    if (id < 1 || (fd = open(fpath, O_WRONLY | O_CREAT, 0644)) == -1)
    return -1;

    lseek(fd, (off_t) (size * (id - 1)), SEEK_SET);
    PttLock(fd, size, F_WRLCK);
    safewrite(fd, rptr, size);
    PttLock(fd, size, F_UNLCK);
    close(fd);

    return 0;
}

/* rocker.011022: 避免lock檔開啟時不正常斷線,造成永久lock */
static int
force_open(char *fname)
{
    int             fd;
    time_t          expire;

    expire = now - 3600;    /* lock 存在超過一個小時就是有問題! */

    if (dasht(fname) < expire)
    return -1;
    unlink(fname);
    fd = open(fname, O_WRONLY | O_TRUNC, 0644);

    return fd;
}


#if !defined(_BBS_UTIL_C_)
/* new/old/lock file processing */
typedef struct nol_t {
    char            newfn[256];
    char            oldfn[256];
    char            lockfn[256];
}               nol_t;

static void
nolfilename(nol_t * n, char *fpath)
{
    snprintf(n->newfn, sizeof(n->newfn), "%s.new", fpath);
    snprintf(n->oldfn, sizeof(n->oldfn), "%s.old", fpath);
    snprintf(n->lockfn, sizeof(n->lockfn), "%s.lock", fpath);
}

int
delete_record(char fpath[], int size, int id)
{
    nol_t           my;
    char            abuf[BUFSIZE];
    int             fdr, fdw, fd;
    int             count;

    nolfilename(&my, fpath);
    if ((fd = open(my.lockfn, O_RDWR | O_CREAT | O_APPEND, 0644)) == -1)
    return -1;

    flock(fd, LOCK_EX);

    if ((fdr = open(fpath, O_RDONLY, 0)) == -1) {
    move(10, 10);
    outs("delete_record failed!!! (open)");
    pressanykey();
    flock(fd, LOCK_UN);
    close(fd);
    return -1;
    }
    if (
    ((fdw = open(my.newfn, O_WRONLY | O_CREAT | O_EXCL, 0644)) == -1) &&
    ((fdw = force_open(my.newfn)) == -1)) {
    flock(fd, LOCK_UN);
    close(fd);
    close(fdr);
    return -1;
    }
    count = 1;
    while (read(fdr, abuf, size) == size) {
    if (id != count++ && (safewrite(fdw, abuf, size) == -1)) {
        unlink(my.newfn);
        close(fdr);
        close(fdw);
        flock(fd, LOCK_UN);
        close(fd);
        return -1;
    }
    }
    close(fdr);
    close(fdw);
    if (Rename(fpath, my.oldfn) == -1 || Rename(my.newfn, fpath) == -1) {
    flock(fd, LOCK_UN);
    close(fd);
    return -1;
    }
    flock(fd, LOCK_UN);
    close(fd);
    return 0;
}

#if 0
static char    *
title_body(char *title)
{
    if (!strncasecmp(title, str_reply, 3)) {
    title += 3;
    if (*title == ' ')
        title++;
    }
    return title;
}
#endif

int
delete_range(char *fpath, int id1, int id2)
{
    fileheader_t    fhdr;
    nol_t           my;
    char            fullpath[STRLEN], *t;
    int             fdr, fdw, fd;
    int             count;

    nolfilename(&my, fpath);

    if ((fd = open(my.lockfn, O_RDWR | O_CREAT | O_APPEND, 0644)) == -1)
    return -1;

    flock(fd, LOCK_EX);

    if ((fdr = open(fpath, O_RDONLY, 0)) == -1) {
    flock(fd, LOCK_UN);
    close(fd);
    return -1;
    }
    if (
    ((fdw = open(my.newfn, O_WRONLY | O_CREAT | O_EXCL, 0644)) == -1) &&
    ((fdw = force_open(my.newfn)) == -1)) {
    close(fdr);
    flock(fd, LOCK_UN);
    close(fd);
    return -1;
    }
    count = 1;
    strlcpy(fullpath, fpath, sizeof(fullpath));
    t = strrchr(fullpath, '/');
    assert(t);
    t++;

    while (read(fdr, &fhdr, sizeof(fileheader_t)) == sizeof(fileheader_t)) {
    strcpy(t, fhdr.filename);

    /* rocker.011018: add new tag delete */
    if (
        (fhdr.filemode & FILE_MARKED) ||    /* 標記 */
        (fhdr.filemode & FILE_DIGEST) ||    /* 文摘 */
        (id1 && (count < id1 || count > id2)) ||    /* range */
        (!id1 && Tagger(atoi(t + 2), count, TAG_NIN))) {    /* TagList */
        if ((safewrite(fdw, &fhdr, sizeof(fileheader_t)) == -1)) {
        close(fdr);
        close(fdw);
        unlink(my.newfn);
        flock(fd, LOCK_UN);
        close(fd);
        return -1;
        }
    } else {
        //if (dashd(fullpath))
        unlink(fullpath);
    }
    ++count;
    }
    close(fdr);
    close(fdw);
    if (Rename(fpath, my.oldfn) == -1 || Rename(my.newfn, fpath) == -1) {
    flock(fd, LOCK_UN);
    close(fd);
    return -1;
    }
    flock(fd, LOCK_UN);
    close(fd);
    return 0;
}

int
search_rec(char *dirname, int (*filecheck) ())
{
    fileheader_t    fhdr;
    FILE           *fp;
    int             ans = 0;

    if (!(fp = fopen(dirname, "r")))
    return 0;

    while (fread(&fhdr, sizeof(fhdr), 1, fp)) {
    ans++;
    if ((*filecheck) (&fhdr)) {
        fclose(fp);
        return ans;
    }
    }
    fclose(fp);
    return 0;
}


#ifdef SAFE_ARTICLE_DELETE
int
safe_article_delete(int ent, fileheader_t *fhdr, char *direct)
{
    fileheader_t newfhdr;
    memcpy(&newfhdr, fhdr, sizeof(fileheader_t));
    sprintf(newfhdr.title, "(本文已被刪除)");
    strcpy(newfhdr.filename, ".deleted");
    strcpy(newfhdr.owner, "-");
    substitute_record(direct, &newfhdr, sizeof(newfhdr), ent);
    return 0;
}

int
safe_article_delete_range(char *direct, int from, int to)
{
    fileheader_t newfhdr;
    int     fd;
    char    fn[128], *ptr;

    strlcpy(fn, direct, sizeof(fn));
    if( (ptr = rindex(fn, '/')) == NULL )
    return 0;

    ++ptr;
    if( (fd = open(direct, O_RDWR)) != -1 &&
    lseek(fd, sizeof(fileheader_t) * (from - 1), SEEK_SET) != -1 ){

    for( ; from <= to ; ++from ){
        read(fd, &newfhdr, sizeof(fileheader_t));
        if( newfhdr.filemode & (FILE_MARKED | FILE_DIGEST) )
        continue;
        strlcpy(ptr, newfhdr.filename, sizeof(newfhdr.filename));
        unlink(fn);

        sprintf(newfhdr.title, "(本文已被刪除)");
        strcpy(newfhdr.filename, ".deleted");
        strcpy(newfhdr.owner, "-");
        // because off_t is unsigned, we could NOT seek backward.
        lseek(fd, sizeof(fileheader_t) * (from - 1), SEEK_SET);
        write(fd, &newfhdr, sizeof(fileheader_t));
    }
    close(fd);
    }
    return 0;
}
#endif

int
delete_file(char *dirname, int size, int ent, int (*filecheck) ())
{
    char            abuf[BUFSIZE];
    int             fd;
    struct stat     st;
    long            numents;

    if (ent < 1 || (fd = open(dirname, O_RDWR)) == -1)
    return -1;
    flock(fd, LOCK_EX);
    fstat(fd, &st);
    numents = ((long)st.st_size) / size;
    if (((long)st.st_size) % size)
    fprintf(stderr, "align err\n");
    if (lseek(fd, (off_t) size * (ent - 1), SEEK_SET) != -1) {
    if (read(fd, abuf, size) == size) {
        if ((*filecheck) (abuf)) {
        int             i;

        for (i = ent; i < numents; i++) {
            if (lseek(fd, (off_t) ((i) * size), SEEK_SET) == -1 ||
            read(fd, abuf, size) != size ||
            lseek(fd, (off_t) (i - 1) * size, SEEK_SET) == -1)
            break;
            if (safewrite(fd, abuf, size) != size)
            break;
        }
        ftruncate(fd, (off_t) size * (numents - 1));
        flock(fd, LOCK_UN);
        close(fd);
        return 0;
        }
    }
    }
    lseek(fd, 0, SEEK_SET);
    ent = 1;
    while (read(fd, abuf, size) == size) {
    if ((*filecheck) (abuf)) {
        int             i;

        for (i = ent; i < numents; i++) {
        if (lseek(fd, (off_t) (i + 1) * size, SEEK_SET) == -1 ||
            read(fd, abuf, size) != size ||
            lseek(fd, (off_t) (i) * size, SEEK_SET) == -1 ||
            safewrite(fd, abuf, size) != size)
            break;
        }
        ftruncate(fd, (off_t) size * (numents - 1));
        flock(fd, LOCK_UN);
        close(fd);
        return 0;
    }
    ent++;
    }
    flock(fd, LOCK_UN);
    close(fd);
    return -1;
}

#endif              /* !defined(_BBS_UTIL_C_) */

int             apply_record(char *fpath, int (*fptr) (), int size){
    char            abuf[BUFSIZE];
    FILE           *fp;

    if (!(fp = fopen(fpath, "r")))
    return -1;

    while (fread(abuf, 1, size, fp) == (size_t)size)
    if ((*fptr) (abuf) == QUIT) {
        fclose(fp);
        return QUIT;
    }
    fclose(fp);
    return 0;
}

/* mail / post 時，依據時間建立檔案，加上郵戳 */
int
stampfile(char *fpath, fileheader_t * fh)
{
    register char  *ip = fpath;
    time_t          dtime = COMMON_TIME;
    struct tm      *ptime;
    int             fp = 0;

    if (access(fpath, X_OK | R_OK | W_OK))
    mkdir(fpath, 0755);

    while (*(++ip));
    *ip++ = '/';
    do {
    sprintf(ip, "M.%d.A.%3.3X", (int)++dtime, rand() & 0xFFF);
    if (fp == -1 && errno != EEXIST)
        return -1;
    } while ((fp = open(fpath, O_CREAT | O_EXCL | O_WRONLY, 0644)) == -1);
    close(fp);
    memset(fh, 0, sizeof(fileheader_t));
    strlcpy(fh->filename, ip, sizeof(fh->filename));
    ptime = localtime(&dtime);
    snprintf(fh->date, sizeof(fh->date),
         "%2d/%02d", ptime->tm_mon + 1, ptime->tm_mday);
    return 0;
}

void
stampdir(char *fpath, fileheader_t * fh)
{
    register char  *ip = fpath;
    time_t          dtime = COMMON_TIME;
    struct tm      *ptime;

    if (access(fpath, X_OK | R_OK | W_OK))
    mkdir(fpath, 0755);

    while (*(++ip));
    *ip++ = '/';
    do {
    sprintf(ip, "D%X", (int)++dtime & 07777);
    } while (mkdir(fpath, 0755) == -1);
    memset(fh, 0, sizeof(fileheader_t));
    strlcpy(fh->filename, ip, sizeof(fh->filename));
    ptime = localtime(&dtime);
    snprintf(fh->date, sizeof(fh->date),
         "%2d/%02d", ptime->tm_mon + 1, ptime->tm_mday);
}

void
stamplink(char *fpath, fileheader_t * fh)
{
    register char  *ip = fpath;
    time_t          dtime = COMMON_TIME;
    struct tm      *ptime;

    if (access(fpath, X_OK | R_OK | W_OK))
    mkdir(fpath, 0755);

    while (*(++ip));
    *ip++ = '/';
    do {
    sprintf(ip, "S%X", (int)++dtime);
    } while (symlink("temp", fpath) == -1);
    memset(fh, 0, sizeof(fileheader_t));
    strlcpy(fh->filename, ip, sizeof(fh->filename));
    ptime = localtime(&dtime);
    snprintf(fh->date, sizeof(fh->date),
         "%2d/%02d", ptime->tm_mon + 1, ptime->tm_mday);
}

int
do_append(char *fpath, fileheader_t * record, int size)
{
    int             fd, fsize=0;
    struct stat     st;

    if ((fd = open(fpath, O_WRONLY | O_CREAT, 0644)) == -1) {
    perror("open");
    return -1;
    }
    flock(fd, LOCK_EX);

    if(fstat(fd, &st)!=-1)
       fsize = st.st_size;

    lseek(fd, (fsize / size) * size, SEEK_SET);  // avoid offset

    safewrite(fd, record, size);

    flock(fd, LOCK_UN);
    close(fd);
    return 0;
}

int
append_record(char *fpath, fileheader_t * record, int size)
{
#if !defined(_BBS_UTIL_C_)
    int             m, n;
    if (get_num_records(fpath, sizeof(fileheader_t)) <= MAX_KEEPMAIL * 2) {
    FILE           *fp;
    char            buf[512], address[200];

    for (n = strlen(fpath) - 1; fpath[n] != '/' && n > 0; n--);
    strncpy(buf, fpath, n + 1);
    buf[n + 1] = 0;
    for (m = strlen(buf) - 2; buf[m] != '/' && m > 0; m--);
    strcat(buf, ".forward"); // XXX check buffer size
    if ((fp = fopen(buf, "r"))) {
        fscanf(fp, "%s", address); // XXX check buffer size
        fclose(fp);
        if (buf[0] != 0 && buf[0] != ' ') {
        buf[n + 1] = 0;
        strcat(buf, record->filename);
        do_append(fpath, record, size);
#ifndef  USE_BSMTP
        bbs_sendmail(buf, record->title, address);
#else
        bsmtp(buf, record->title, address, 0);
#endif
        return 0;
        }
    }
    }
#endif

    do_append(fpath, record, size);

    return 0;
}