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RFC3986 in section 3.1 "Scheme" says that > Although schemes are case-insensitive, the canonical form is > lowercase and documents that specify schemes must do so with > lowercase letters. An implementation should accept uppercase > letters as equivalent to lowercase in scheme names (e.g., allow > "HTTP" as well as "http") for the sake of robustness but should only > produce lowercase scheme names for consistency. so we cope with that. The other possibility would have been to use strcasecmp instead of strcmp when checking on the protocol, but since the "case" version, although popular, is not part of any standard AFAIK I prefer downcasing while parsing and be done with it.
366 lines
7.0 KiB
C
366 lines
7.0 KiB
C
/*
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* Copyright (c) 2020 Omar Polo <op@omarpolo.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <ctype.h>
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#include <string.h>
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#include "gmid.h"
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static inline int
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unreserved(int p)
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{
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return isalnum(p)
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|| p == '-'
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|| p == '.'
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|| p == '_'
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|| p == '~';
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}
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static inline int
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sub_delimiters(int p)
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{
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return p == '!'
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|| p == '$'
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|| p == '&'
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|| p == '\''
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|| p == '('
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|| p == ')'
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|| p == '*'
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|| p == '+'
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|| p == ','
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|| p == ';'
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|| p == '=';
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}
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static int
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parse_pct_encoded(struct parser *p)
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{
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if (*p->iri != '%')
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return 0;
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if (!isxdigit(*(p->iri+1)) || !isxdigit(*(p->iri+2))) {
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p->err = "illegal percent-encoding";
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return 0;
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}
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sscanf(p->iri+1, "%2hhx", p->iri);
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memmove(p->iri+1, p->iri+3, strlen(p->iri+3)+1);
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if (*p->iri == '\0') {
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p->err = "illegal percent-encoding";
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return 0;
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}
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return 1;
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}
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/* ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) "://" */
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static int
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parse_scheme(struct parser *p)
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{
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p->parsed->schema = p->iri;
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if (!isalpha(*p->iri)) {
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p->err = "illegal character in scheme";
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return 0;
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}
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do {
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/* normalize the scheme (i.e. lowercase it)
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*
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* XXX: since we cannot have good things, tolower
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* depends on the LC_CTYPE locale. The good things is
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* that we're sure p->iri points to something in the
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* ASCII range, so it shouldn't do weird stuff. */
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*p->iri = tolower(*p->iri);
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p->iri++;
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} while (isalnum(*p->iri)
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|| *p->iri == '+'
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|| *p->iri == '-'
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|| *p->iri == '.');
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if (*p->iri != ':') {
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p->err = "illegal character in scheme";
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return 0;
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}
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*p->iri = '\0';
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if (*(++p->iri) != '/' || *(++p->iri) != '/') {
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p->err = "invalid marker after scheme";
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return 0;
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}
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p->iri++;
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return 1;
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}
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/* *DIGIT */
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static int
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parse_port(struct parser *p)
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{
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uint32_t i = 0;
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p->parsed->port = p->iri;
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for (; isdigit(*p->iri); p->iri++) {
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i = i * 10 + *p->iri - '0';
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if (i > UINT16_MAX) {
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p->err = "port number too large";
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return 0;
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}
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}
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if (*p->iri != '/' && *p->iri != '\0') {
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p->err = "illegal character in port number";
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return 0;
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}
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p->parsed->port_no = i;
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if (*p->iri != '\0') {
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*p->iri = '\0';
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p->iri++;
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}
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return 1;
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}
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/* TODO: add support for ip-literal and ipv4addr ? */
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/* *( unreserved / sub-delims / pct-encoded ) */
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static int
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parse_authority(struct parser *p)
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{
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p->parsed->host = p->iri;
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while (unreserved(*p->iri)
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|| sub_delimiters(*p->iri)
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|| parse_pct_encoded(p))
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p->iri++;
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if (p->err != NULL)
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return 0;
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if (*p->iri == ':') {
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*p->iri = '\0';
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p->iri++;
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return parse_port(p);
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}
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if (*p->iri == '/') {
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*p->iri = '\0';
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p->iri++;
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return 1;
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}
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if (*p->iri == '\0')
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return 1;
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p->err = "illegal character in authority section";
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return 0;
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}
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/* Routine for path_clean. Elide the pointed .. with the preceding
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* element. Return 0 if it's not possible. incr is the length of
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* the increment, 3 for ../ and 2 for .. */
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static int
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path_elide_dotdot(char *path, char *i, int incr)
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{
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char *j;
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if (i == path)
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return 0;
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for (j = i-2; j != path && *j != '/'; j--)
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/* noop */ ;
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if (*j == '/')
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j++;
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i += incr;
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memmove(j, i, strlen(i)+1);
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return 1;
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}
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/*
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* Use an algorithm similar to the one implemented in go' path.Clean:
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*
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* 1. Replace multiple slashes with a single slash
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* 2. Eliminate each . path name element
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* 3. Eliminate each inner .. along with the non-.. element that precedes it
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* 4. Eliminate trailing .. if possible or error (go would only discard)
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*
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* Unlike path.Clean, this function return the empty string if the
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* original path is equivalent to "/".
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*/
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static int
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path_clean(char *path)
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{
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char *i;
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/* 1. replace multiple slashes with a single one */
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for (i = path; *i; ++i) {
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if (*i == '/' && *(i+1) == '/') {
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memmove(i, i+1, strlen(i)); /* move also the \0 */
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i--;
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}
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}
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/* 2. eliminate each . path name element */
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for (i = path; *i; ++i) {
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if ((i == path || *i == '/') &&
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*i != '.' && i[1] == '.' && i[2] == '/') {
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/* move also the \0 */
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memmove(i, i+2, strlen(i)-1);
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i--;
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}
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}
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if (!strcmp(path, ".") || !strcmp(path, "/.")) {
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*path = '\0';
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return 1;
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}
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/* 3. eliminate each inner .. along with the preceding non-.. */
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for (i = strstr(path, "../"); i != NULL; i = strstr(path, ".."))
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if (!path_elide_dotdot(path, i, 3))
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return 0;
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/* 4. eliminate trailing ..*/
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if ((i = strstr(path, "..")) != NULL)
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if (!path_elide_dotdot(path, i, 2))
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return 0;
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return 1;
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}
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static int
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parse_query(struct parser *p)
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{
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p->parsed->query = p->iri;
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if (*p->iri == '\0')
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return 1;
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while (unreserved(*p->iri)
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|| sub_delimiters(*p->iri)
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|| *p->iri == '/'
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|| *p->iri == '?'
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|| parse_pct_encoded(p)
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|| valid_multibyte_utf8(p))
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p->iri++;
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if (p->err != NULL)
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return 0;
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if (*p->iri != '\0' && *p->iri != '#') {
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p->err = "illegal character in query";
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return 0;
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}
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if (*p->iri != '\0') {
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*p->iri = '\0';
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p->iri++;
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}
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return 1;
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}
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/* don't even bother */
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static int
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parse_fragment(struct parser *p)
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{
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p->parsed->fragment = p->iri;
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return 1;
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}
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/* XXX: is it too broad? */
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/* *(pchar / "/") */
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static int
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parse_path(struct parser *p)
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{
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char c;
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p->parsed->path = p->iri;
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if (*p->iri == '\0') {
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p->parsed->query = p->parsed->fragment = p->iri;
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return 1;
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}
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while (unreserved(*p->iri)
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|| sub_delimiters(*p->iri)
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|| *p->iri == '/'
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|| parse_pct_encoded(p)
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|| valid_multibyte_utf8(p))
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p->iri++;
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if (p->err != NULL)
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return 0;
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if (*p->iri != '\0' && *p->iri != '?' && *p->iri != '#') {
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p->err = "illegal character in path";
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return 0;
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}
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if (*p->iri != '\0') {
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c = *p->iri;
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*p->iri = '\0';
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p->iri++;
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if (c == '#') {
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if (!parse_fragment(p))
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return 0;
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} else
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if (!parse_query(p) || !parse_fragment(p))
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return 0;
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}
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if (!path_clean(p->parsed->path)) {
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p->err = "illegal path";
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return 0;
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}
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return 1;
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}
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int
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parse_iri(char *iri, struct iri *ret, const char **err_ret)
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{
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char *end;
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struct parser p = {iri, ret, NULL};
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bzero(ret, sizeof(*ret));
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/* initialize optional stuff to the empty string */
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end = iri + strlen(iri);
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p.parsed->port = end;
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p.parsed->path = end;
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p.parsed->query = end;
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p.parsed->fragment = end;
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if (!parse_scheme(&p) || !parse_authority(&p) || !parse_path(&p)) {
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*err_ret = p.err;
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return 0;
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}
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*err_ret = NULL;
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return 1;
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}
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int
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trim_req_iri(char *iri)
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{
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char *i;
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if ((i = strstr(iri, "\r\n")) == NULL)
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return 0;
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*i = '\0';
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return 1;
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}
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