xlat.c

radius server在linux下的源码

				openbraces++;
				*pa++ = *p++;
				break;

			case '}':
				openbraces--;
				if (openbraces == *open) {
					p++;
					stop=1;
				} else {
					*pa++ = *p++;
				}
				break;

				/*
				 *  Attr-Name1:-Attr-Name2
				 *
				 *  Use Attr-Name1, and if not found,
				 *  use Attr-Name2.
				 */
			case ':':
				if (p[1] == '-') {
					p += 2;
					stop = 1;
					break;
				}
				/* else FALL-THROUGH */

			default:
				*pa++ = *p++;
				break;
		}
	}
	*pa = '\0';

	/*
	 *	Look up almost everything in the new tree of xlat
	 *	functions.  this makes it a little quicker...
	 */
	if ((c = xlat_find(attrname)) != NULL) {
		if (!c->internal) DEBUG("radius_xlat: Running registered xlat function of module %s for string \'%s\'",
					c->module, attrname+ c->length + 1);
		retlen = c->do_xlat(c->instance, request, attrname+(c->length+1), q, freespace, func);
		/* If retlen is 0, treat it as not found */
		if (retlen == 0) {
			found = 0;
		} else {
			found = 1;
			q += retlen;
		}

		/*
		 *	Not in the default xlat database.  Must be
		 *	a bare attribute number.
		 */
	} else if ((retlen = xlat_packet(&xlat_inst[1], request, attrname,
					 q, freespace, func)) > 0) {
		found = 1;
		q += retlen;

		/*
		 *	Look up the name, in order to get the correct
		 *	debug message.
		 */
#ifndef NDEBUG
	} else if (dict_attrbyname(attrname) == NULL) {
		/*
		 *	No attribute by that name, return an error.
		 */
		DEBUG2("WARNING: Attempt to use unknown xlat function, or non-existent attribute in string %%{%s}", attrname);
#endif
	} /* else the attribute is known, but not in the request */

	/*
	 * Skip to last '}' if attr is found
	 * The rest of the stuff within the braces is
	 * useless if we found what we need
	 */
	if (found) {
		while((*p != '\0') && (openbraces > 0)) {
			/*
			 *	Handle escapes outside of the loop.
			 */
			if (*p == '\\') {
				p++;
				if (!*p) break;
				p++; /* get & ignore next character */
				continue;
			}

			switch (*p) {
			default:
				break;

				/*
				 *  Bare brace
				 */
			case '{':
				openbraces++;
				break;

			case '}':
				openbraces--;
				break;
			}
			p++;	/* skip the character */
		}
	}

	*open = openbraces;
	*from = p;
	*to = q;
}

/*
 *  If the caller doesn't pass xlat an escape function, then
 *  we use this one.  It simplifies the coding, as the check for
 *  func == NULL only happens once.
 */
static int xlat_copy(char *out, int outlen, const char *in)
{
	int len = 0;

	while (*in) {
		/*
		 *  Truncate, if too much.
		 */
		if (len >= outlen) {
			break;
		}

		/*
		 *  Copy data.
		 *
		 *  FIXME: Do escaping of bad stuff!
		 */
		*out = *in;

		out++;
		in++;
		len++;
	}

	*out = '\0';
	return len;
}

/*
 *	Replace %<whatever> in a string.
 *
 *	See 'doc/variables.txt' for more information.
 */
int radius_xlat(char *out, int outlen, const char *fmt,
		REQUEST *request, RADIUS_ESCAPE_STRING func)
{
	int i, c,freespace;
	const char *p;
	char *q;
	VALUE_PAIR *tmp;
	struct tm *TM, s_TM;
	char tmpdt[40]; /* For temporary storing of dates */
	int openbraces=0;

	/*
	 *	Catch bad modules.
	 */
	if (!fmt || !out || !request) return 0;

	/*
	 *  Ensure that we always have an escaping function.
	 */
	if (func == NULL) {
		func = xlat_copy;
	}

	q = out;
	p = fmt;
	while (*p) {
		/* Calculate freespace in output */
		freespace = outlen - (q - out);
		if (freespace <= 1)
			break;
		c = *p;

		if ((c != '%') && (c != '$') && (c != '\\')) {
			/*
			 * We check if we're inside an open brace.  If we are
			 * then we assume this brace is NOT literal, but is
			 * a closing brace and apply it
			 */
			if ((c == '}') && openbraces) {
				openbraces--;
				p++; /* skip it */
				continue;
			}
			*q++ = *p++;
			continue;
		}

		/*
		 *	There's nothing after this character, copy
		 *	the last '%' or "$' or '\\' over to the output
		 *	buffer, and exit.
		 */
		if (*++p == '\0') {
			*q++ = c;
			break;
		}

		if (c == '\\') {
			switch(*p) {
			case '\\':
				*q++ = *p;
				break;
			case 't':
				*q++ = '\t';
				break;
			case 'n':
				*q++ = '\n';
				break;
			default:
				*q++ = c;
				*q++ = *p;
				break;
			}
			p++;

			/*
			 *	Hmmm... ${User-Name} is a synonym for
			 *	%{User-Name}.
			 *
			 *	Why, exactly?
			 */
		} else if (c == '$') switch(*p) {
			case '{': /* Attribute by Name */
				decode_attribute(&p, &q, freespace, &openbraces, request, func);
				break;
			default:
				*q++ = c;
				*q++ = *p++;
				break;

		} else if (c == '%') switch(*p) {
			case '{':
				decode_attribute(&p, &q, freespace, &openbraces, request, func);
				break;

			case '%':
				*q++ = *p++;
				break;
			case 'a': /* Protocol: */
				q += valuepair2str(q,freespace,pairfind(request->reply->vps,PW_FRAMED_PROTOCOL),PW_TYPE_INTEGER, func);
				p++;
				break;
			case 'c': /* Callback-Number */
				q += valuepair2str(q,freespace,pairfind(request->reply->vps,PW_CALLBACK_NUMBER),PW_TYPE_STRING, func);
				p++;
				break;
			case 'd': /* request day */
				TM = localtime_r(&request->timestamp, &s_TM);
				strftime(tmpdt,sizeof(tmpdt),"%d",TM);
				strNcpy(q,tmpdt,freespace);
				q += strlen(q);
				p++;
				break;
			case 'f': /* Framed IP address */
				q += valuepair2str(q,freespace,pairfind(request->reply->vps,PW_FRAMED_IP_ADDRESS),PW_TYPE_IPADDR, func);
				p++;
				break;
			case 'i': /* Calling station ID */
				q += valuepair2str(q,freespace,pairfind(request->packet->vps,PW_CALLING_STATION_ID),PW_TYPE_STRING, func);
				p++;
				break;
			case 'l': /* request timestamp */
				snprintf(tmpdt, sizeof(tmpdt), "%lu",
					 (unsigned long) request->timestamp);
				strNcpy(q,tmpdt,freespace);
				q += strlen(q);
				p++;
				break;
			case 'm': /* request month */
				TM = localtime_r(&request->timestamp, &s_TM);
				strftime(tmpdt,sizeof(tmpdt),"%m",TM);
				strNcpy(q,tmpdt,freespace);
				q += strlen(q);
				p++;
				break;
			case 'n': /* NAS IP address */
				q += valuepair2str(q,freespace,pairfind(request->packet->vps,PW_NAS_IP_ADDRESS),PW_TYPE_IPADDR, func);
				p++;
				break;
			case 'p': /* Port number */
				q += valuepair2str(q,freespace,pairfind(request->packet->vps,PW_NAS_PORT),PW_TYPE_INTEGER, func);
				p++;
				break;
			case 's': /* Speed */
				q += valuepair2str(q,freespace,pairfind(request->packet->vps,PW_CONNECT_INFO),PW_TYPE_STRING, func);
				p++;
				break;
			case 't': /* request timestamp */
				CTIME_R(&request->timestamp, q, freespace);
				q += strlen(q);
				p++;
				break;
			case 'u': /* User name */
				q += valuepair2str(q,freespace,pairfind(request->packet->vps,PW_USER_NAME),PW_TYPE_STRING, func);
				p++;
				break;
			case 'A': /* radacct_dir */
				strNcpy(q,radacct_dir,freespace-1);
				q += strlen(q);
				p++;
				break;
			case 'C': /* ClientName */
				strNcpy(q,client_name(request->packet->src_ipaddr),freespace-1);
				q += strlen(q);
				p++;
				break;
			case 'D': /* request date */
				TM = localtime_r(&request->timestamp, &s_TM);
				strftime(tmpdt,sizeof(tmpdt),"%Y%m%d",TM);
				strNcpy(q,tmpdt,freespace);
				q += strlen(q);
				p++;
				break;
			case 'H': /* request hour */
				TM = localtime_r(&request->timestamp, &s_TM);
				strftime(tmpdt,sizeof(tmpdt),"%H",TM);
				strNcpy(q,tmpdt,freespace);
				q += strlen(q);
				p++;
				break;
			case 'L': /* radlog_dir */
				strNcpy(q,radlog_dir,freespace-1);
				q += strlen(q);
				p++;
				break;
			case 'M': /* MTU */
				q += valuepair2str(q,freespace,pairfind(request->reply->vps,PW_FRAMED_MTU),PW_TYPE_INTEGER, func);
				p++;
				break;
			case 'R': /* radius_dir */
				strNcpy(q,radius_dir,freespace-1);
				q += strlen(q);
				p++;
				break;
			case 'S': /* request timestamp in SQL format*/
				TM = localtime_r(&request->timestamp, &s_TM);
				strftime(tmpdt,sizeof(tmpdt),"%Y-%m-%d %H:%M:%S",TM);
				strNcpy(q,tmpdt,freespace);
				q += strlen(q);
				p++;
				break;
			case 'T': /* request timestamp */
				TM = localtime_r(&request->timestamp, &s_TM);
				strftime(tmpdt,sizeof(tmpdt),"%Y-%m-%d-%H.%M.%S.000000",TM);
				strNcpy(q,tmpdt,freespace);
				q += strlen(q);
				p++;
				break;
			case 'U': /* Stripped User name */
				q += valuepair2str(q,freespace,pairfind(request->packet->vps,PW_STRIPPED_USER_NAME),PW_TYPE_STRING, func);
				p++;
				break;
			case 'V': /* Request-Authenticator */
				if (request->packet->verified)
					strNcpy(q,"Verified",freespace-1);
				else
					strNcpy(q,"None",freespace-1);
				q += strlen(q);
				p++;
				break;
			case 'Y': /* request year */
				TM = localtime_r(&request->timestamp, &s_TM);
				strftime(tmpdt,sizeof(tmpdt),"%Y",TM);
				strNcpy(q,tmpdt,freespace);
				q += strlen(q);
				p++;
				break;
			case 'Z': /* Full request pairs except password */
				tmp = request->packet->vps;
				while (tmp && (freespace > 3)) {
					if (tmp->attribute != PW_PASSWORD) {
						*q++ = '\t';
						i = vp_prints(q,freespace-2,tmp);
						q += i;
						freespace -= (i+2);
						*q++ = '\n';
					}
					tmp = tmp->next;
				}
				p++;
				break;
			default:
				DEBUG2("WARNING: Unknown variable '%%%c': See 'doc/variables.txt'", *p);
				if (freespace > 2) {
					*q++ = '%';
					*q++ = *p++;
				}
				break;
		}
	}
	*q = '\0';

	DEBUG2("radius_xlat:  '%s'", out);

	return strlen(out);
}