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boinc/lib/parse.cpp

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// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2023 University of California
//
// BOINC is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// BOINC is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
// This file contains two XML parsers:
//
// 1) a very crude one, which assumes all elements are either single-line or
// have start and end tags on separate lines.
// This is meant to be used ONLY for parsing XML files produced
// by the BOINC scheduling server or client.
//
// 2) a better one (class XML_PARSER) which parses arbitrary XML
#if defined(_WIN32)
#include "boinc_win.h"
#else
#include "config.h"
#include <cstring>
#include <cstdlib>
#include <string>
#include <cmath>
#include <ctype.h>
#include <errno.h>
#if HAVE_IEEEFP_H
#include <ieeefp.h>
#endif
#endif
#ifdef __APPLE__
#include <xlocale.h>
#endif
#include "boinc_stdio.h"
#include "error_numbers.h"
#include "str_replace.h"
#include "str_util.h"
#include "util.h"
#include "parse.h"
using std::string;
unsigned long long boinc_strtoull(const char *str, char **endptr, int base) {
#if (defined (__cplusplus) && __cplusplus > 199711L) || defined(HAVE_STRTOULL) || defined(__MINGW32__)
return strtoull(str, endptr, base);
#elif defined(_WIN32) && !defined(__MINGW32__)
return _strtoui64(str, endptr, base);
#else
char buf[64];
char *p;
unsigned long long y;
strncpy(buf, str, sizeof(buf)-1);
strip_whitespace(buf);
p = strstr(buf, "0x");
if (!p) p = strstr(buf, "0X");
if (p) {
sscanf(p, "%llx", &y);
} else {
sscanf(buf, "%llu", &y);
}
return y;
#endif
}
// Parse a boolean; tag is of form "foobar"
// Accept either <foobar/>, <foobar />, or <foobar>0|1</foobar>
// (possibly with leading/trailing white space)
//
bool parse_bool(const char* buf, const char* tag, bool& result) {
char tag2[256], tag3[256];
int x;
// quick check to reject most cases
//
if (!strstr(buf, tag)) {
return false;
}
snprintf(tag2, sizeof(tag2), "<%s/>", tag);
snprintf(tag3, sizeof(tag3), "<%s />", tag);
if (match_tag(buf, tag2) || match_tag(buf, tag3)) {
result = true;
return true;
}
snprintf(tag2, sizeof(tag2), "<%s>", tag);
if (parse_int(buf, tag2, x)) {
result = (x != 0);
return true;
}
return false;
}
// parse a string of the form ...<tag attrs>string</tag>...;
// returns the "string" part.
// Does XML unescaping (replace &lt; with <)
// "string" may not include '<'
// Strips white space from ends.
// Use "<tag", not "<tag>", if there might be attributes
//
bool parse_str(const char* buf, const char* tag, char* dest, int destlen) {
string str;
const char* p;
int len;
p = strstr(buf, tag);
if (!p) return false;
p = strchr(p, '>');
if (!p) return false;
p++;
const char* q = strchr(p, '<');
if (!q) return false;
len = (int)(q-p);
if (len >= destlen) len = destlen-1;
memcpy(dest, p, len);
dest[len] = 0;
strip_whitespace(dest);
xml_unescape(dest);
return true;
}
bool parse_str(const char* buf, const char* tag, string& dest) {
char tempbuf[1024];
if (!parse_str(buf, tag, tempbuf, 1024)) return false;
dest = tempbuf;
return true;
}
// parse a string of the form 'xxx name="value" xxx';
// returns value in dest
//
void parse_attr(const char* buf, const char* name, char* dest, int len) {
const char* p;
const char *q;
strcpy(dest, "");
p = strstr(buf, name);
if (!p) return;
p = strchr(p, '"');
if (!p) return;
q = strchr(p+1, '"');
if (!q) return;
if (len > q-p) len = (int)(q-p);
strlcpy(dest, p+1, len);
}
int copy_stream(FILE* in, FILE* out) {
char buf[1024];
size_t n, m;
while (1) {
n = boinc::fread(buf, 1, 1024, in);
m = boinc::fwrite(buf, 1, n, out);
if (m != n) return ERR_FWRITE;
if (n < 1024) break;
}
return 0;
}
// append to a malloc'd string
// If reallocation fails, the pointer p remains unchanged, and the data will
// not be freed. (strong exception safety)
//
int strcatdup(char*& p, char* buf) {
char* new_p = (char*)realloc(p, strlen(p) + strlen(buf)+1);
if (!new_p) {
return ERR_MALLOC;
}
p = new_p;
strcat(p, buf);
return 0;
}
// Copy from a file to a malloc'd string until the end tag is reached
// Does NOT copy the start and end tags.
//
int dup_element_contents(FILE* in, const char* end_tag, char** pp) {
string buf;
int retval = copy_element_contents(in, end_tag, buf);
if (retval) return retval;
*pp = strdup(buf.c_str());
return 0;
}
int dup_element(FILE* in, const char* tag_name, char** pp) {
char start_tag[256], end_tag[256];
string buf, buf2;
snprintf(start_tag, sizeof(start_tag), "<%s>\n", tag_name);
snprintf(end_tag, sizeof(end_tag), "</%s>", tag_name);
int retval = copy_element_contents(in, end_tag, buf);
if (retval) return retval;
buf2 = start_tag + buf + end_tag;
*pp = strdup(buf2.c_str());
return 0;
}
// copy input up to but not including end tag, to a char array
//
int copy_element_contents(FILE* in, const char* end_tag, char* p, size_t len) {
string buf;
int retval = copy_element_contents(in, end_tag, buf);
if (retval) return retval;
if (buf.size() > len-1) {
return ERR_BUFFER_OVERFLOW;
}
strlcpy(p, buf.c_str(), len);
return 0;
}
// copy input up to but not including end tag, to a string
//
int copy_element_contents(FILE* in, const char* end_tag, string& str) {
int c;
size_t end_tag_len = strlen(end_tag);
size_t n = 0;
str = "";
while (1) {
c = boinc::fgetc(in);
if (c == EOF) break;
str += c;
n++;
if (n < end_tag_len) {
continue;
}
const char* p = str.c_str() + n - end_tag_len;
if (!strcmp(p, end_tag)) {
str.erase(n-end_tag_len, end_tag_len);
return 0;
}
}
return ERR_XML_PARSE;
}
// replace XML element contents (element must be present)
//
void replace_element_contents(
char* buf, const char* start, const char* end, const char* replacement
) {
char temp[4096], *p, *q;
p = strstr(buf, start);
p += strlen(start);
q = strstr(p, end);
strlcpy(temp, q, sizeof(temp));
strcpy(p, replacement);
strcat(p, temp);
}
// if the string contains a substring of the form X...Y,
// remove the first such.
bool remove_element(char* buf, const char* start, const char* end) {
char* p, *q;
p = strstr(buf, start);
if (!p) return false;
q = strstr(p+strlen(start), end);
if (!q) return false;
strcpy_overlap(p, q+strlen(end));
return true;
}
// replace a substring. Do at most one instance.
//
bool str_replace(char* str, const char* substr, const char* replacement) {
char temp[4096], *p;
p = strstr(str, substr);
if (!p) return false;
int n = (int)strlen(substr);
safe_strcpy(temp, p+n);
strcpy(p, replacement);
strcat(p, temp);
return true;
}
// if the given XML has an element of the form
// <venue name="venue_name">
// ...
// </venue>
// then return the contents of that element.
// Otherwise strip out all <venue> elements
//
void extract_venue(const char* in, const char* venue_name, char* out, int len) {
const char* p, *q;
char* wp;
char buf[256];
const size_t venue_close_tag_len = strlen("</venue>");
snprintf(buf, sizeof(buf), "<venue name=\"%s\">", venue_name);
p = strstr(in, buf);
if (p) {
// prefs contain the specified venue
//
p += strlen(buf);
strlcpy(out, p, len);
wp = strstr(out, "</venue");
if (wp) *wp = 0;
} else {
// prefs don't contain the specified venue
//
q = in;
strcpy(out, "");
while (1) {
p = strstr(q, "<venue");
if (!p) {
strlcat(out, q, len);
break;
}
strncat(out, q, p-q);
q = strstr(p, "</venue>");
if (!q) break;
q += venue_close_tag_len;
}
}
}
// copy a line from the given string.
// kinda like fgets() when you're reading from a string
//
char* sgets(char* buf, int len, char*& in) {
char* p;
p = strchr(in, '\n');
if (!p) return NULL;
*p = 0;
strlcpy(buf, in, len);
*p = '\n';
in = p+1;
return buf;
}
void non_ascii_escape(const char* in, char* out, int len) {
char buf[256], *p;
p = out;
for (; *in; in++) {
int x = (int) *in;
x &= 0xff; // just in case
if (x>127) {
snprintf(buf, sizeof(buf), "&#%d;", x);
strcpy(p, buf);
p += strlen(buf);
} else {
*p++ = x;
}
if (p > out + len - 8) break;
}
*p = 0;
}
// NOTE: these used to take std::string instead of char* args.
// But this performed poorly.
//
// NOTE: output buffer should be 6X size of input
//
void xml_escape(const char* in, char* out, int len) {
char buf[256], *p;
p = out;
for (; *in; in++) {
int x = (int) *in;
x &= 0xff; // just in case
if (x == '<') {
strcpy(p, "&lt;");
p += 4;
} else if (x == '&') {
strcpy(p, "&amp;");
p += 5;
} else if (x>127) {
snprintf(buf, sizeof(buf), "&#%d;", x);
strcpy(p, buf);
p += strlen(buf);
} else if (x<32) {
switch(x) {
case 9:
case 10:
case 13:
snprintf(buf, sizeof(buf), "&#%d;", x);
strcpy(p, buf);
p += strlen(buf);
break;
}
} else if (x == ']') {
// two stage check, strncmp() is slow
if (!strncmp(in, "]]>", 3)) {
strcpy(p, "]]&gt;");
p += 6;
in += 2; // +1 from for loop
} else {
*p++ = x;
}
} else {
*p++ = x;
}
if (p > out + len - 8) break;
}
*p = 0;
}
// Note: XML unescaping never increases string length
//
void xml_unescape(string& in) {
int n = (int)in.size()+1+16; // +16 avoids valgrind warnings
char* buf = (char*)malloc(n);
strcpy(buf, in.c_str());
xml_unescape(buf);
in = buf;
free(buf);
}
void xml_unescape(char* buf) {
char* out = buf;
char* in = buf;
char* p;
bool goodescape;
while (*in) {
goodescape = false;
if (*in != '&') { // avoid strncmp's if possible
*out++ = *in++;
} else if (!strncmp(in, "&lt;", 4)) {
*out++ = '<';
in += 4;
} else if (!strncmp(in, "&gt;", 4)) {
*out++ = '>';
in += 4;
} else if (!strncmp(in, "&quot;", 6)) {
*out++ = '"';
in += 6;
} else if (!strncmp(in, "&apos;", 6)) {
*out++ = '\'';
in += 6;
} else if (!strncmp(in, "&amp;", 5)) {
*out++ = '&';
in += 5;
} else if (!strncmp(in, "&#xD;", 5) || !strncmp(in, "&#xd;", 5)) {
*out++ = '\r';
in += 5;
} else if (!strncmp(in, "&#xA;", 5) || !strncmp(in, "&#xa;", 5)) {
*out++ = '\n';
in += 5;
} else if (!strncmp(in, "&#", 2)) {
//If escape is poorly formed or outside of char size, then print as is.
in += 2;
p = strchr(in, ';');
if (!p || *in == ';') { //No end semicolon found or it was formatted as &#;
*out++ = '&';
*out++ = '#';
} else {
//Check that escape is formed correctly
for (unsigned int i = 0; i < 4 || i < strlen(in); i++) {
if (!isdigit(*(in + i)) && *(in + i) != ';') {
//Found something other than a single digit.
break;
}
if (*(in + i) == ';') {
goodescape = true;
break;
}
}
int ascii = atoi(in);
if (goodescape && ascii < 256) {
*out++ = ascii;
in = p + 1;
} else {
*out++ = '&';
*out++ = '#';
}
}
} else {
*out++ = *in++;
}
}
*out = 0;
}
#if 0
// we got an unrecognized line.
// If it has two <'s (e.g. <foo>xx</foo>) return 0.
// If it's of the form <foo/> return 0.
// If it's of the form <foo> then scan for </foo> and return 0.
// Otherwise return ERR_XML_PARSE
//
int skip_unrecognized(char* buf, MIOFILE& fin) {
char* p, *q, buf2[256];
std::string close_tag;
p = strchr(buf, '<');
if (!p) {
return ERR_XML_PARSE;
}
if (strchr(p+1, '<')) {
return 0;
}
q = strchr(p+1, '>');
if (!q) {
return ERR_XML_PARSE;
}
if (q[-1] == '/') return 0;
*q = 0;
close_tag = string("</") + string(p+1) + string(">");
while (fin.fgets(buf2, 256)) {
if (strstr(buf2, close_tag.c_str())) {
return 0;
}
}
return ERR_XML_PARSE;
}
#endif
XML_PARSER::XML_PARSER(MIOFILE* _f) {
strcpy(parsed_tag, "");
is_tag = false;
f = _f;
}
int XML_PARSER::scan_comment() {
char buf[256];
char* p = buf;
while (1) {
int c = f->_getc();
if (!c || c == EOF) return XML_PARSE_EOF;
*p++ = c;
*p = 0;
if (strstr(buf, "-->")) {
return XML_PARSE_COMMENT;
}
if (strlen(buf) > 32) {
strcpy_overlap(buf, buf+16);
p -= 16;
}
}
}
int XML_PARSER::scan_cdata(char* buf, int len) {
char* p = buf;
len--;
while (1) {
int c = f->_getc();
if (!c || c == EOF) return XML_PARSE_EOF;
if (len) {
*p++ = c;
len--;
}
if (c == '>') {
*p = 0;
char* q = strstr(buf, "]]>");
if (q) {
*q = 0;
return XML_PARSE_CDATA;
}
}
}
}
static inline bool is_empty_string(char* parsed_tag, const char* start_tag) {
size_t n = strlen(parsed_tag);
char tag[TAG_BUF_LEN];
// handle the archaic form <tag/>, which means empty string
//
if (parsed_tag[n-1] == '/') {
strcpy(tag, parsed_tag);
tag[n-1] = 0;
if (!strcmp(tag, start_tag)) {
return true;
}
}
return false;
}
// we've parsed the start tag of a string; parse the string itself.
//
bool XML_PARSER::parse_str_aux(const char* start_tag, char* buf, int len) {
bool eof;
char end_tag[TAG_BUF_LEN], tag[TAG_BUF_LEN];
end_tag[0] = '/';
strcpy(end_tag+1, start_tag);
// get text after start tag
//
int retval = get_aux(buf, len, 0, 0);
if (retval == XML_PARSE_EOF) return false;
if (retval == XML_PARSE_OVERFLOW) return false;
// if it's the end tag, return empty string
//
if (retval == XML_PARSE_TAG) {
if (strcmp(buf, end_tag)) {
return false;
} else {
strcpy(buf, "");
return true;
}
}
eof = get(tag, sizeof(tag), is_tag);
if (eof) return false;
if (!is_tag) return false;
if (strcmp(tag, end_tag)) return false;
if (retval != XML_PARSE_CDATA) {
xml_unescape(buf);
}
return true;
}
// We just parsed "parsed_tag".
// If it matches "start_tag", and is followed by a string
// and by the matching close tag, return the string in "buf",
// and return true.
//
bool XML_PARSER::parse_str(const char* start_tag, char* buf, int len) {
if (is_empty_string(parsed_tag, start_tag)) {
strcpy(buf, "");
return true;
}
if (strcmp(parsed_tag, start_tag)) return false;
return parse_str_aux(start_tag, buf, len);
}
#define MAX_XML_STRING 262144
// same, for std::string
//
bool XML_PARSER::parse_string(const char* start_tag, string& str) {
bool flag = false;
if (is_empty_string(parsed_tag, start_tag)) {
str = "";
return true;
}
if (strcmp(parsed_tag, start_tag)) return false;
char *buf=(char *)malloc(MAX_XML_STRING);
if (buf) {
flag = parse_str_aux(start_tag, buf, MAX_XML_STRING);
if (flag) {
str = buf;
}
free(buf);
}
return flag;
}
// Same, for integers
//
bool XML_PARSER::parse_int(const char* start_tag, int& i) {
char buf[256], *end;
bool eof;
char end_tag[TAG_BUF_LEN], tag[TAG_BUF_LEN];
if (strcmp(parsed_tag, start_tag)) return false;
end_tag[0] = '/';
strcpy(end_tag+1, start_tag);
eof = get(buf, sizeof(buf), is_tag);
if (eof) return false;
if (is_tag) {
if (!strcmp(buf, end_tag)) {
i = 0; // treat <foo></foo> as <foo>0</foo>
return true;
} else {
return false;
}
}
errno = 0;
int val = strtol(buf, &end, 0);
if (errno) return false;
if (end != buf+strlen(buf)) return false;
eof = get(tag, sizeof(tag), is_tag);
if (eof) return false;
if (!is_tag) return false;
if (strcmp(tag, end_tag)) return false;
i = val;
return true;
}
// Same, for long
//
bool XML_PARSER::parse_long(const char* start_tag, long& i) {
char buf[256], *end;
bool eof;
char end_tag[TAG_BUF_LEN], tag[TAG_BUF_LEN];
if (strcmp(parsed_tag, start_tag)) return false;
end_tag[0] = '/';
strcpy(end_tag+1, start_tag);
eof = get(buf, sizeof(buf), is_tag);
if (eof) return false;
if (is_tag) {
if (!strcmp(buf, end_tag)) {
i = 0; // treat <foo></foo> as <foo>0</foo>
return true;
} else {
return false;
}
}
errno = 0;
long val = strtol(buf, &end, 0);
if (errno) return false;
if (end != buf+strlen(buf)) return false;
eof = get(tag, sizeof(tag), is_tag);
if (eof) return false;
if (!is_tag) return false;
if (strcmp(tag, end_tag)) return false;
i = val;
return true;
}
// Same, for doubles
//
bool XML_PARSER::parse_double(const char* start_tag, double& x) {
char buf[256], *end;
bool eof;
char end_tag[TAG_BUF_LEN], tag[TAG_BUF_LEN];
if (strcmp(parsed_tag, start_tag)) return false;
end_tag[0] = '/';
strcpy(end_tag+1, start_tag);
eof = get(buf, sizeof(buf), is_tag);
if (eof) return false;
if (is_tag) {
if (!strcmp(buf, end_tag)) {
x = 0; // treat <foo></foo> as <foo>0</foo>
return true;
} else {
return false;
}
}
errno = 0;
#if (defined(__APPLE__) && defined(BUILDING_MANAGER))
// MacOS 13.3.1 apparently broke per-thread locale uselocale()
double val = strtod_l(buf, &end, LC_C_LOCALE);
#else
double val = strtod(buf, &end);
#endif
if (errno) return false;
if (end != buf+strlen(buf)) return false;
eof = get(tag, sizeof(tag), is_tag);
if (eof) return false;
if (!is_tag) return false;
if (strcmp(tag, end_tag)) return false;
x = val;
return true;
}
// Same, for unsigned long
//
bool XML_PARSER::parse_ulong(const char* start_tag, unsigned long& x) {
char buf[256], *end;
bool eof;
char end_tag[TAG_BUF_LEN], tag[TAG_BUF_LEN];
if (strcmp(parsed_tag, start_tag)) return false;
end_tag[0] = '/';
strcpy(end_tag+1, start_tag);
eof = get(buf, sizeof(buf), is_tag);
if (eof) return false;
if (is_tag) {
if (!strcmp(buf, end_tag)) {
x = 0; // treat <foo></foo> as <foo>0</foo>
return true;
} else {
return false;
}
}
errno = 0;
unsigned long val = strtoul(buf, &end, 0);
if (errno) return false;
if (end != buf+strlen(buf)) return false;
eof = get(tag, sizeof(tag), is_tag);
if (eof) return false;
if (!is_tag) return false;
if (strcmp(tag, end_tag)) return false;
x = val;
return true;
}
// Same, for unsigned long long
//
bool XML_PARSER::parse_ulonglong(const char* start_tag, unsigned long long& x) {
char buf[256], *end=0;
bool eof;
char end_tag[TAG_BUF_LEN], tag[TAG_BUF_LEN];
if (strcmp(parsed_tag, start_tag)) return false;
end_tag[0] = '/';
strcpy(end_tag+1, start_tag);
eof = get(buf, sizeof(buf), is_tag);
if (eof) return false;
if (is_tag) {
if (!strcmp(buf, end_tag)) {
x = 0; // treat <foo></foo> as <foo>0</foo>
return true;
} else {
return false;
}
}
errno = 0;
unsigned long long val = boinc_strtoull(buf, &end, 0);
if (errno) return false;
if (end != buf+strlen(buf)) return false;
eof = get(tag, sizeof(tag), is_tag);
if (eof) return false;
if (!is_tag) return false;
if (strcmp(tag, end_tag)) return false;
x = val;
return true;
}
// Same, for bools
//
bool XML_PARSER::parse_bool(const char* start_tag, bool& b) {
char buf[256], *end;
bool eof;
char end_tag[TAG_BUF_LEN], tag[TAG_BUF_LEN];
// handle the archaic form <tag/>, which means true
//
safe_strcpy(tag, start_tag);
strcat(tag, "/");
if (!strcmp(parsed_tag, tag)) {
b = true;
return true;
}
// otherwise look for something of the form <tag>int</tag>
//
if (strcmp(parsed_tag, start_tag)) return false;
eof = get(buf, sizeof(buf), is_tag);
if (eof) return false;
if (is_tag) return false;
bool val = (strtol(buf, &end, 0) != 0);
if (end != buf+strlen(buf)) return false;
end_tag[0] = '/';
strcpy(end_tag+1, start_tag);
eof = get(tag, sizeof(tag), is_tag);
if (eof) return false;
if (!is_tag) return false;
if (strcmp(tag, end_tag)) return false;
b = val;
return true;
}
// parse a start tag (optionally preceded by <?xml>)
//
bool XML_PARSER::parse_start(const char* start_tag) {
char tag[TAG_BUF_LEN];
bool eof;
eof = get(tag, sizeof(tag), is_tag);
if (eof || !is_tag ) {
return false;
}
if (strstr(tag, "?xml")) {
eof = get(tag, sizeof(tag), is_tag);
if (eof || !is_tag ) {
return false;
}
}
if (strcmp(tag, start_tag)) {
return false;
}
return true;
}
// We got an unexpected tag.
// If it's an end tag, do nothing.
// Otherwise skip until the end tag, if any
//
void XML_PARSER::skip_unexpected(
const char* start_tag, bool verbose, const char* where
) {
char buf[TAG_BUF_LEN], end_tag[TAG_BUF_LEN];
if (verbose) {
boinc::fprintf(stderr,
"%s: Unrecognized XML tag '<%s>' in %s; skipping\n",
time_to_string(dtime()), start_tag, where
);
}
if (strchr(start_tag, '/')) return;
snprintf(end_tag, sizeof(end_tag), "/%s", start_tag);
while (1) {
int c;
bool eof = scan_nonws(c);
if (eof) return;
if (c == '<') {
int retval = scan_tag(buf, sizeof(buf), 0, 0);
if (retval != XML_PARSE_TAG) continue;
if (!strcmp(buf, end_tag)) return;
skip_unexpected(buf, false, where);
}
}
}
// we just parsed a tag.
// copy this entire element, including start and end tags, to the buffer
//
int XML_PARSER::copy_element(string& out) {
char end_tag[TAG_BUF_LEN], buf[ELEMENT_BUF_LEN];
// handle <foo/> case
//
size_t n = strlen(parsed_tag);
if (parsed_tag[n-1] == '/') {
out = "<";
out += parsed_tag;
out += ">";
return 0;
}
if (strchr(parsed_tag, '/')) return ERR_XML_PARSE;
out = "<";
out += parsed_tag;
out += ">";
snprintf(end_tag, sizeof(end_tag), "</%.256s>", parsed_tag);
int retval = element_contents(end_tag, buf, sizeof(buf));
if (retval) return retval;
out += buf;
out += end_tag;
return 0;
}
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