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-rw-r--r--src/exim_dbmbuild.c548
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diff --git a/src/exim_dbmbuild.c b/src/exim_dbmbuild.c
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+++ b/src/exim_dbmbuild.c
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+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2020 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+
+/* A small freestanding program to build dbm databases from serial input. For
+alias files, this program fulfils the function of the newaliases program used
+by other mailers, but it can be used for other dbm data files too. It operates
+by writing a new file or files, and then renaming; otherwise old entries can
+never get flushed out.
+
+This program is clever enough to cope with ndbm, which creates two files called
+<name>.dir and <name>.pag, or with db, which creates a single file called
+<name>.db. If native db is in use (USE_DB defined) or tdb is in use (USE_TDB
+defined) there is no extension to the output filename. This is also handled. If
+there are any other variants, the program won't cope.
+
+The first argument to the program is the name of the serial file; the second
+is the base name for the DBM file(s). When native db is in use, these must be
+different.
+
+Input lines beginning with # are ignored, as are blank lines. Entries begin
+with a key terminated by a colon or end of line or whitespace and continue with
+indented lines. Keys may be quoted if they contain colons or whitespace or #
+characters. */
+
+
+#include "exim.h"
+
+uschar * spool_directory = NULL; /* dummy for dbstuff.h */
+
+/******************************************************************************/
+ /* dummies needed by Solaris build */
+void
+millisleep(int msec)
+{}
+uschar *
+readconf_printtime(int t)
+{ return NULL; }
+void *
+store_get_3(int size, BOOL tainted, const char *filename, int linenumber)
+{ return NULL; }
+void **
+store_reset_3(void **ptr, int pool, const char *filename, int linenumber)
+{ return NULL; }
+void
+store_release_above_3(void *ptr, const char *func, int linenumber)
+{ }
+gstring *
+string_vformat_trc(gstring * g, const uschar * func, unsigned line,
+ unsigned size_limit, unsigned flags, const char *format, va_list ap)
+{ return NULL; }
+uschar *
+string_sprintf_trc(const char * a, const uschar * b, unsigned c, ...)
+{ return NULL; }
+BOOL
+string_format_trc(uschar * buf, int len, const uschar * func, unsigned line,
+ const char * fmt, ...)
+{ return FALSE; }
+void
+log_write(unsigned int selector, int flags, const char *format, ...)
+{ }
+
+
+struct global_flags f;
+unsigned int log_selector[1];
+uschar * queue_name;
+BOOL split_spool_directory;
+/******************************************************************************/
+
+
+#define max_insize 20000
+#define max_outsize 100000
+
+/* This is global because it's defined in the headers and compilers grumble
+if it is made static. */
+
+const uschar *hex_digits = CUS"0123456789abcdef";
+
+
+#ifdef STRERROR_FROM_ERRLIST
+/* Some old-fashioned systems still around (e.g. SunOS4) don't have strerror()
+in their libraries, but can provide the same facility by this simple
+alternative function. */
+
+char *
+strerror(int n)
+{
+if (n < 0 || n >= sys_nerr) return "unknown error number";
+return sys_errlist[n];
+}
+#endif /* STRERROR_FROM_ERRLIST */
+
+
+/* For Berkeley DB >= 2, we can define a function to be called in case of DB
+errors. This should help with debugging strange DB problems, e.g. getting "File
+exists" when you try to open a db file. The API changed at release 4.3. */
+
+#if defined(USE_DB) && defined(DB_VERSION_STRING)
+void
+# if DB_VERSION_MAJOR > 4 || (DB_VERSION_MAJOR == 4 && DB_VERSION_MINOR >= 3)
+dbfn_bdb_error_callback(const DB_ENV *dbenv, const char *pfx, const char *msg)
+{
+dbenv = dbenv;
+# else
+dbfn_bdb_error_callback(const char *pfx, char *msg)
+{
+# endif
+pfx = pfx;
+printf("Berkeley DB error: %s\n", msg);
+}
+#endif
+
+
+
+/*************************************************
+* Interpret escape sequence *
+*************************************************/
+
+/* This function is copied from the main Exim code.
+
+Arguments:
+ pp points a pointer to the initiating "\" in the string;
+ the pointer gets updated to point to the final character
+Returns: the value of the character escape
+*/
+
+int
+string_interpret_escape(const uschar **pp)
+{
+int ch;
+const uschar *p = *pp;
+ch = *(++p);
+if (ch == '\0') return **pp;
+if (isdigit(ch) && ch != '8' && ch != '9')
+ {
+ ch -= '0';
+ if (isdigit(p[1]) && p[1] != '8' && p[1] != '9')
+ {
+ ch = ch * 8 + *(++p) - '0';
+ if (isdigit(p[1]) && p[1] != '8' && p[1] != '9')
+ ch = ch * 8 + *(++p) - '0';
+ }
+ }
+else switch(ch)
+ {
+ case 'n': ch = '\n'; break;
+ case 'r': ch = '\r'; break;
+ case 't': ch = '\t'; break;
+ case 'x':
+ ch = 0;
+ if (isxdigit(p[1]))
+ {
+ ch = ch * 16 +
+ Ustrchr(hex_digits, tolower(*(++p))) - hex_digits;
+ if (isxdigit(p[1])) ch = ch * 16 +
+ Ustrchr(hex_digits, tolower(*(++p))) - hex_digits;
+ }
+ break;
+ }
+*pp = p;
+return ch;
+}
+
+
+/*************************************************
+* Main Program *
+*************************************************/
+
+int main(int argc, char **argv)
+{
+int started;
+int count = 0;
+int dupcount = 0;
+int yield = 0;
+int arg = 1;
+int add_zero = 1;
+BOOL lowercase = TRUE;
+BOOL warn = TRUE;
+BOOL duperr = TRUE;
+BOOL lastdup = FALSE;
+#if !defined (USE_DB) && !defined(USE_TDB) && !defined(USE_GDBM)
+int is_db = 0;
+struct stat statbuf;
+#endif
+FILE *f;
+EXIM_DB *d;
+EXIM_DATUM key, content;
+uschar *bptr;
+uschar keybuffer[256];
+uschar temp_dbmname[512];
+uschar real_dbmname[512];
+uschar dirname[512];
+uschar *buffer = malloc(max_outsize);
+uschar *line = malloc(max_insize);
+
+while (argc > 1)
+ {
+ if (Ustrcmp(argv[arg], "-nolc") == 0) lowercase = FALSE;
+ else if (Ustrcmp(argv[arg], "-nowarn") == 0) warn = FALSE;
+ else if (Ustrcmp(argv[arg], "-lastdup") == 0) lastdup = TRUE;
+ else if (Ustrcmp(argv[arg], "-noduperr") == 0) duperr = FALSE;
+ else if (Ustrcmp(argv[arg], "-nozero") == 0) add_zero = 0;
+ else break;
+ arg++;
+ argc--;
+ }
+
+if (argc != 3)
+ {
+ printf("usage: exim_dbmbuild [-nolc] <source file> <dbm base name>\n");
+ exit(1);
+ }
+
+if (Ustrcmp(argv[arg], "-") == 0)
+ f = stdin;
+else if (!(f = fopen(argv[arg], "rb")))
+ {
+ printf("exim_dbmbuild: unable to open %s: %s\n", argv[arg], strerror(errno));
+ exit(1);
+ }
+
+/* By default Berkeley db does not put extensions on... which
+can be painful! */
+
+#if defined(USE_DB) || defined(USE_TDB) || defined(USE_GDBM)
+if (Ustrcmp(argv[arg], argv[arg+1]) == 0)
+ {
+ printf("exim_dbmbuild: input and output filenames are the same\n");
+ exit(1);
+ }
+#endif
+
+/* Check length of filename; allow for adding .dbmbuild_temp and .db or
+.dir/.pag later. */
+
+if (strlen(argv[arg+1]) > sizeof(temp_dbmname) - 20)
+ {
+ printf("exim_dbmbuild: output filename is ridiculously long\n");
+ exit(1);
+ }
+
+Ustrcpy(temp_dbmname, US argv[arg+1]);
+Ustrcat(temp_dbmname, US".dbmbuild_temp");
+
+Ustrcpy(dirname, temp_dbmname);
+if ((bptr = Ustrrchr(dirname, '/')))
+ *bptr = '\0';
+else
+ Ustrcpy(dirname, US".");
+
+/* It is apparently necessary to open with O_RDWR for this to work
+with gdbm-1.7.3, though no reading is actually going to be done. */
+
+EXIM_DBOPEN(temp_dbmname, dirname, O_RDWR|O_CREAT|O_EXCL, 0644, &d);
+
+if (d == NULL)
+ {
+ printf("exim_dbmbuild: unable to create %s: %s\n", temp_dbmname,
+ strerror(errno));
+ (void)fclose(f);
+ exit(1);
+ }
+
+/* Unless using native db calls, see if we have created <name>.db; if not,
+assume .dir & .pag */
+
+#if !defined(USE_DB) && !defined(USE_TDB) && !defined(USE_GDBM)
+sprintf(CS real_dbmname, "%s.db", temp_dbmname);
+is_db = Ustat(real_dbmname, &statbuf) == 0;
+#endif
+
+/* Now do the business */
+
+bptr = buffer;
+started = 0;
+
+while (Ufgets(line, max_insize, f) != NULL)
+ {
+ uschar *p;
+ int len = Ustrlen(line);
+
+ p = line + len;
+
+ if (len >= max_insize - 1 && p[-1] != '\n')
+ {
+ printf("Overlong line read: max permitted length is %d\n", max_insize - 1);
+ yield = 2;
+ goto TIDYUP;
+ }
+
+ if (line[0] == '#') continue;
+ while (p > line && isspace(p[-1])) p--;
+ *p = 0;
+ if (line[0] == 0) continue;
+
+ /* A continuation line is valid only if there was a previous first
+ line. */
+
+ if (isspace(line[0]))
+ {
+ uschar *s = line;
+ if (!started)
+ {
+ printf("Unexpected continuation line ignored\n%s\n\n", line);
+ continue;
+ }
+ while (isspace(*s)) s++;
+ *(--s) = ' ';
+
+ if (bptr - buffer + p - s >= max_outsize - 1)
+ {
+ printf("Continued set of lines is too long: max permitted length is %d\n",
+ max_outsize -1);
+ yield = 2;
+ goto TIDYUP;
+ }
+
+ Ustrcpy(bptr, s);
+ bptr += p - s;
+ }
+
+ /* A first line must have a name followed by a colon or whitespace or
+ end of line, but first finish with a previous line. The key is lower
+ cased by default - this is what the newaliases program for sendmail does.
+ However, there's an option not to do this. */
+
+ else
+ {
+ int i, rc;
+ uschar *s = line;
+ uschar *keystart;
+
+ if (started)
+ {
+ EXIM_DATUM_INIT(content);
+ EXIM_DATUM_DATA(content) = CS buffer;
+ EXIM_DATUM_SIZE(content) = bptr - buffer + add_zero;
+
+ switch(rc = EXIM_DBPUTB(d, key, content))
+ {
+ case EXIM_DBPUTB_OK:
+ count++;
+ break;
+
+ case EXIM_DBPUTB_DUP:
+ if (warn) fprintf(stderr, "** Duplicate key \"%s\"\n", keybuffer);
+ dupcount++;
+ if(duperr) yield = 1;
+ if (lastdup) EXIM_DBPUT(d, key, content);
+ break;
+
+ default:
+ fprintf(stderr, "Error %d while writing key %s: errno=%d\n", rc,
+ keybuffer, errno);
+ yield = 2;
+ goto TIDYUP;
+ }
+
+ bptr = buffer;
+ }
+
+ EXIM_DATUM_INIT(key);
+ EXIM_DATUM_DATA(key) = CS keybuffer;
+
+ /* Deal with quoted keys. Escape sequences always make one character
+ out of several, so we can re-build in place. */
+
+ if (*s == '\"')
+ {
+ uschar *t = s++;
+ keystart = t;
+ while (*s != 0 && *s != '\"')
+ {
+ *t++ = *s == '\\'
+ ? string_interpret_escape((const uschar **)&s)
+ : *s;
+ s++;
+ }
+ if (*s != 0) s++; /* Past terminating " */
+ EXIM_DATUM_SIZE(key) = t - keystart + add_zero;
+ }
+ else
+ {
+ keystart = s;
+ while (*s != 0 && *s != ':' && !isspace(*s)) s++;
+ EXIM_DATUM_SIZE(key) = s - keystart + add_zero;
+ }
+
+ if (EXIM_DATUM_SIZE(key) > 256)
+ {
+ printf("Keys longer than 255 characters cannot be handled\n");
+ started = 0;
+ yield = 2;
+ goto TIDYUP;
+ }
+
+ if (lowercase)
+ for (i = 0; i < EXIM_DATUM_SIZE(key) - add_zero; i++)
+ keybuffer[i] = tolower(keystart[i]);
+ else
+ for (i = 0; i < EXIM_DATUM_SIZE(key) - add_zero; i++)
+ keybuffer[i] = keystart[i];
+
+ keybuffer[i] = 0;
+ started = 1;
+
+ while (isspace(*s))s++;
+ if (*s == ':')
+ {
+ s++;
+ while (isspace(*s))s++;
+ }
+ if (*s != 0)
+ {
+ Ustrcpy(bptr, s);
+ bptr += p - s;
+ }
+ else buffer[0] = 0;
+ }
+ }
+
+if (started)
+ {
+ int rc;
+ EXIM_DATUM_INIT(content);
+ EXIM_DATUM_DATA(content) = CS buffer;
+ EXIM_DATUM_SIZE(content) = bptr - buffer + add_zero;
+
+ switch(rc = EXIM_DBPUTB(d, key, content))
+ {
+ case EXIM_DBPUTB_OK:
+ count++;
+ break;
+
+ case EXIM_DBPUTB_DUP:
+ if (warn) fprintf(stderr, "** Duplicate key \"%s\"\n", keybuffer);
+ dupcount++;
+ if (duperr) yield = 1;
+ if (lastdup) EXIM_DBPUT(d, key, content);
+ break;
+
+ default:
+ fprintf(stderr, "Error %d while writing key %s: errno=%d\n", rc,
+ keybuffer, errno);
+ yield = 2;
+ break;
+ }
+ }
+
+/* Close files, rename or abandon the temporary files, and exit */
+
+TIDYUP:
+
+EXIM_DBCLOSE(d);
+(void)fclose(f);
+
+/* If successful, output the number of entries and rename the temporary
+files. */
+
+if (yield == 0 || yield == 1)
+ {
+ printf("%d entr%s written\n", count, (count == 1)? "y" : "ies");
+ if (dupcount > 0)
+ {
+ printf("%d duplicate key%s \n", dupcount, (dupcount > 1)? "s" : "");
+ }
+
+ #if defined(USE_DB) || defined(USE_TDB) || defined(USE_GDBM)
+ Ustrcpy(real_dbmname, temp_dbmname);
+ Ustrcpy(buffer, US argv[arg+1]);
+ if (Urename(real_dbmname, buffer) != 0)
+ {
+ printf("Unable to rename %s as %s\n", real_dbmname, buffer);
+ return 1;
+ }
+ #else
+
+ /* Rename a single .db file */
+
+ if (is_db)
+ {
+ sprintf(CS real_dbmname, "%s.db", temp_dbmname);
+ sprintf(CS buffer, "%s.db", argv[arg+1]);
+ if (Urename(real_dbmname, buffer) != 0)
+ {
+ printf("Unable to rename %s as %s\n", real_dbmname, buffer);
+ return 1;
+ }
+ }
+
+ /* Rename .dir and .pag files */
+
+ else
+ {
+ sprintf(CS real_dbmname, "%s.dir", temp_dbmname);
+ sprintf(CS buffer, "%s.dir", argv[arg+1]);
+ if (Urename(real_dbmname, buffer) != 0)
+ {
+ printf("Unable to rename %s as %s\n", real_dbmname, buffer);
+ return 1;
+ }
+
+ sprintf(CS real_dbmname, "%s.pag", temp_dbmname);
+ sprintf(CS buffer, "%s.pag", argv[arg+1]);
+ if (Urename(real_dbmname, buffer) != 0)
+ {
+ printf("Unable to rename %s as %s\n", real_dbmname, buffer);
+ return 1;
+ }
+ }
+
+ #endif /* USE_DB || USE_TDB || USE_GDBM */
+ }
+
+/* Otherwise unlink the temporary files. */
+
+else
+ {
+ printf("dbmbuild abandoned\n");
+#if defined(USE_DB) || defined(USE_TDB) || defined(USE_GDBM)
+ /* We created it, so safe to delete despite the name coming from outside */
+ /* coverity[tainted_string] */
+ Uunlink(temp_dbmname);
+#else
+ if (is_db)
+ {
+ sprintf(CS real_dbmname, "%s.db", temp_dbmname);
+ Uunlink(real_dbmname);
+ }
+ else
+ {
+ sprintf(CS real_dbmname, "%s.dir", temp_dbmname);
+ Uunlink(real_dbmname);
+ sprintf(CS real_dbmname, "%s.pag", temp_dbmname);
+ Uunlink(real_dbmname);
+ }
+#endif /* USE_DB || USE_TDB */
+ }
+
+return yield;
+}
+
+/* End of exim_dbmbuild.c */
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