Annotation of embedaddon/strongswan/src/libstrongswan/utils/optionsfrom.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 2007-2008 Andreas Steffen
! 3: * HSR Hochschule fuer Technik Rapperswil
! 4: *
! 5: * This program is free software; you can redistribute it and/or modify it
! 6: * under the terms of the GNU General Public License as published by the
! 7: * Free Software Foundation; either version 2 of the License, or (at your
! 8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
! 9: *
! 10: * This program is distributed in the hope that it will be useful, but
! 11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
! 13: * for more details.
! 14: */
! 15:
! 16: #include <stdio.h>
! 17: #include <errno.h>
! 18:
! 19: #include <library.h>
! 20: #include <utils/debug.h>
! 21: #include <utils/lexparser.h>
! 22:
! 23: #include "optionsfrom.h"
! 24:
! 25: #define MAX_USES 20 /* loop-detection limit */
! 26: #define MORE_ARGS 10 /* first guess at how many arguments we'll need */
! 27:
! 28: /*
! 29: * Defined in header.
! 30: */
! 31:
! 32: typedef struct private_options_t private_options_t;
! 33:
! 34: /**
! 35: * Private data of a options_t object.
! 36: */
! 37: struct private_options_t {
! 38: /**
! 39: * Public interface
! 40: */
! 41: options_t public;
! 42:
! 43: /**
! 44: * reallocated argv array
! 45: */
! 46: char **newargv;
! 47:
! 48: /**
! 49: * number of free arguments in newargv
! 50: */
! 51: int room;
! 52:
! 53: /**
! 54: * number of included option files
! 55: */
! 56: int nuses;
! 57:
! 58: /**
! 59: * allocated space for option files
! 60: */
! 61: char *buffers[MAX_USES];
! 62: };
! 63:
! 64: METHOD(options_t, from, bool,
! 65: private_options_t *this, char *filename, int *argcp, char **argvp[], int optind)
! 66: {
! 67: int newargc;
! 68: int next; /* place for next argument */
! 69: char **newargv;
! 70: chunk_t src, line, token;
! 71: bool good = TRUE;
! 72: int linepos = 0;
! 73: FILE *fd;
! 74:
! 75: /* avoid endless loops with recursive --optionsfrom arguments */
! 76: this->nuses++;
! 77: if (this->nuses >= MAX_USES)
! 78: {
! 79: DBG1(DBG_LIB, "optionsfrom called %d times by \"%s\" - looping?",
! 80: this->nuses + 1, (*argvp)[0]);
! 81: return FALSE;
! 82: }
! 83:
! 84: fd = fopen(filename, "r");
! 85: if (fd == NULL)
! 86: {
! 87: DBG1(DBG_LIB, "optionsfrom: unable to open file '%s': %s",
! 88: filename, strerror(errno));
! 89: return FALSE;
! 90: }
! 91:
! 92: /* determine the file size */
! 93: if (fseek(fd, 0, SEEK_END) == -1 || (src.len = ftell(fd)) == -1)
! 94: {
! 95: DBG1(DBG_LIB, "optionsfrom: unable to determine size of '%s': %s",
! 96: filename, strerror(errno));
! 97: fclose(fd);
! 98: return FALSE;
! 99: }
! 100: rewind(fd);
! 101:
! 102: /* allocate one byte more just in case of a missing final newline */
! 103: src.ptr = this->buffers[this->nuses] = malloc(src.len + 1);
! 104:
! 105: /* read the whole file into a chunk */
! 106: if (fread(src.ptr, 1, src.len, fd) != src.len)
! 107: {
! 108: DBG1(DBG_LIB, "optionsfrom: unable to read file '%s': %s",
! 109: filename, strerror(errno));
! 110: free(src.ptr);
! 111: fclose(fd);
! 112: return FALSE;
! 113: }
! 114: fclose(fd);
! 115:
! 116: if (this->room)
! 117: {
! 118: newargc = *argcp;
! 119: newargv = malloc((newargc + 1 + this->room) * sizeof(char *));
! 120: }
! 121: else
! 122: {
! 123: newargc = *argcp + MORE_ARGS;
! 124: this->room = MORE_ARGS;
! 125: newargv = malloc((newargc + 1) * sizeof(char *));
! 126: }
! 127: memcpy(newargv, *argvp, optind * sizeof(char *));
! 128: next = optind;
! 129: newargv[next] = NULL;
! 130:
! 131: while (fetchline(&src, &line) && good)
! 132: {
! 133: linepos++;
! 134: while (eat_whitespace(&line))
! 135: {
! 136: if (*line.ptr == '"'|| *line.ptr == '\'')
! 137: {
! 138: char delimiter = *line.ptr;
! 139:
! 140: line.ptr++;
! 141: line.len--;
! 142: if (!extract_token(&token, delimiter, &line))
! 143: {
! 144: DBG1(DBG_LIB, "optionsfrom: missing terminator at %s:%d",
! 145: filename, linepos);
! 146: good = FALSE;
! 147: break;
! 148: }
! 149: }
! 150: else
! 151: {
! 152: if (!extract_token(&token, ' ', &line))
! 153: {
! 154: /* last token in a line */
! 155: token = line;
! 156: line.len = 0;
! 157: }
! 158: }
! 159:
! 160: /* do we have to allocate more memory for additional arguments? */
! 161: if (this->room == 0)
! 162: {
! 163: newargc += MORE_ARGS;
! 164: newargv = realloc(newargv, (newargc + 1) * sizeof(char *));
! 165: this->room = MORE_ARGS;
! 166: }
! 167:
! 168: /* terminate the token by replacing the delimiter with a null character */
! 169: *(token.ptr + token.len) = '\0';
! 170:
! 171: /* assign the token to the next argument */
! 172: newargv[next] = token.ptr;
! 173: next++;
! 174: this->room--;
! 175: }
! 176: }
! 177:
! 178: /* assign newargv to argv */
! 179: if (good)
! 180: {
! 181: memcpy(newargv + next, *argvp + optind, (*argcp + 1 - optind) * sizeof(char *));
! 182: *argcp += next - optind;
! 183: *argvp = newargv;
! 184: }
! 185:
! 186: /* keep a pointer to the latest newargv and free any earlier version */
! 187: free(this->newargv);
! 188: this->newargv = newargv;
! 189:
! 190: return good;
! 191: }
! 192:
! 193: METHOD(options_t, destroy, void,
! 194: private_options_t *this)
! 195: {
! 196: while (this->nuses >= 0)
! 197: {
! 198: free(this->buffers[this->nuses--]);
! 199: }
! 200: free(this->newargv);
! 201: free(this);
! 202: }
! 203:
! 204: /*
! 205: * Defined in header
! 206: */
! 207: options_t *options_create(void)
! 208: {
! 209: private_options_t *this;
! 210:
! 211: INIT(this,
! 212: .public = {
! 213: .from = _from,
! 214: .destroy = _destroy,
! 215:
! 216: },
! 217: .nuses = -1,
! 218: );
! 219:
! 220: return &this->public;
! 221: }
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