commit - 31f1a758a6a9144108ca1356abef2d56ef12f759
commit + 332ed2e3454e27e1dab4b50a2c06aec9711f8469
blob - bc56c53b31e09dddbca9ab0e5ccaabe4ba280fde (mode 644)
blob + /dev/null
--- url.c
+++ /dev/null
-/*
- * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-/*
- * This is mostly copied from gmid' iri.c, with minor changes. Bugs
- * fixed here should be ported to gmid and vice-versa.
- */
-
-#include <config.h>
-#include <url.h>
-
-#include <ctype.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <string.h>
-
-struct shallow_url {
- char *scheme;
- char *host;
- char *port;
- uint16_t port_no;
- char *path;
- char *query;
- char *fragment;
-};
-
-struct parser {
- char buf[GEMINI_URL_LEN+1];
- char *iri;
- struct shallow_url *parsed;
- const char *err;
-};
-
-static inline int
-unreserved(int p)
-{
- return isalnum(p)
- || p == '-'
- || p == '.'
- || p == '_'
- || p == '~';
-}
-
-static inline int
-sub_delimiters(int p)
-{
- return p == '!'
- || p == '$'
- || p == '&'
- || p == '\''
- || p == '('
- || p == ')'
- || p == '*'
- || p == '+'
- || p == ','
- || p == ';'
- || p == '=';
-}
-
-static int
-valid_pct_enc_string(char *s)
-{
- if (*s != '%')
- return 1;
-
- if (!isxdigit(s[1]) || !isxdigit(s[2]))
- return 0;
-
- if (s[1] == '0' && s[2] == '0')
- return 0;
-
- return 1;
-}
-
-static int
-valid_pct_encoded(struct parser *p)
-{
- if (p->iri[0] != '%')
- return 0;
-
- if (!valid_pct_enc_string(p->iri)) {
- p->err = "illegal percent-encoding";
- return 0;
- }
-
- p->iri += 2;
- return 1;
-}
-
-static void
-pct_decode(char *s)
-{
- sscanf(s+1, "%2hhx", s);
- memmove(s+1, s+3, strlen(s+3)+1);
-}
-
-static int
-parse_pct_encoded(struct parser *p)
-{
- if (p->iri[0] != '%')
- return 0;
-
- if (!valid_pct_enc_string(p->iri)) {
- p->err = "illegal percent-encoding";
- return 0;
- }
-
- pct_decode(p->iri);
- if (*p->iri == '\0') {
- p->err = "illegal percent-encoding";
- return 0;
- }
-
- return 1;
-}
-
-/*
- * ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) "://"
- * or
- * "//"
- */
-static int
-parse_scheme(struct parser *p)
-{
- p->parsed->scheme = p->iri;
-
- if (p->iri[0] == '/' && p->iri[1] == '/') {
- *p->iri = '\0';
- p->iri += 2;
- return 1;
- }
-
- if (!isalpha(*p->iri)) {
- p->err = "illegal character in scheme";
- return 0;
- }
-
- do {
- /* normalize the scheme (i.e. lowercase it)
- *
- * XXX: since we cannot have good things, tolower
- * behaviour depends on the LC_CTYPE locale. The good
- * news is that we're sure p->iri points to something
- * that's in the ASCII range, so tolower can't
- * mis-behave on some systems due to the locale. */
- *p->iri = tolower(*p->iri);
- p->iri++;
- } while (isalnum(*p->iri)
- || *p->iri == '+'
- || *p->iri == '-'
- || *p->iri == '.');
-
- if (*p->iri != ':') {
- p->err = "illegal character in scheme";
- return 0;
- }
-
- *p->iri = '\0';
- if (p->iri[1] != '/' || p->iri[2] != '/') {
- p->err = "invalid marker after scheme";
- return 0;
- }
-
- p->iri += 3;
- return 1;
-}
-
-/* *DIGIT */
-static int
-parse_port(struct parser *p)
-{
- uint32_t i = 0;
-
- p->parsed->port = p->iri;
-
- for (; isdigit(*p->iri); p->iri++) {
- i = i * 10 + *p->iri - '0';
- if (i > UINT16_MAX) {
- p->err = "port number too large";
- return 0;
- }
- }
-
- if (*p->iri != '/' && *p->iri != '\0') {
- p->err = "illegal character in port number";
- return 0;
- }
-
- p->parsed->port_no = i;
-
- if (*p->iri != '\0') {
- *p->iri = '\0';
- p->iri++;
- }
-
- return 1;
-}
-
-/* TODO: add support for ip-literal and ipv4addr ? */
-/* *( unreserved / sub-delims / pct-encoded ) */
-static int
-parse_authority(struct parser *p)
-{
- p->parsed->host = p->iri;
-
- while (unreserved(*p->iri)
- || sub_delimiters(*p->iri)
- || parse_pct_encoded(p)) {
- /* normalize the host name. */
- if (*p->iri < 0x7F)
- *p->iri = tolower(*p->iri);
- p->iri++;
- }
-
- if (p->err != NULL)
- return 0;
-
- if (*p->iri == ':') {
- *p->iri = '\0';
- p->iri++;
- return parse_port(p);
- } else
- p->parsed->port_no = 1965;
-
- if (*p->iri == '/') {
- *p->iri = '\0';
- p->iri++;
- return 1;
- }
-
- if (*p->iri == '\0')
- return 1;
-
- p->err = "illegal character in authority section";
- return 0;
-}
-
-/* Routine for path_clean. Elide the pointed .. with the preceding
- * element. Return 0 if it's not possible. incr is the length of
- * the increment, 3 for ../ and 2 for .. */
-static int
-path_elide_dotdot(char *path, char *i, int incr)
-{
- char *j;
-
- if (i == path)
- return 0;
- for (j = i-2; j != path && *j != '/'; j--)
- /* noop */ ;
- if (*j == '/')
- j++;
- i += incr;
- memmove(j, i, strlen(i)+1);
- return 1;
-}
-
-/*
- * Use an algorithm similar to the one implemented in go' path.Clean:
- *
- * 1. Replace multiple slashes with a single slash
- * 2. Eliminate each . path name element
- * 3. Eliminate each inner .. along with the non-.. element that precedes it
- * 4. Eliminate trailing .. if possible or error (go would only discard)
- *
- * Unlike path.Clean, this function return the empty string if the
- * original path is equivalent to "/".
- */
-static int
-path_clean(char *path)
-{
- char *i;
-
- /* 1. replace multiple slashes with a single one */
- for (i = path; *i; ++i) {
- if (*i == '/' && *(i+1) == '/') {
- memmove(i, i+1, strlen(i)); /* move also the \0 */
- i--;
- }
- }
-
- /* 2. eliminate each . path name element */
- for (i = path; *i; ++i) {
- if ((i == path || *i == '/') &&
- *i != '.' && i[1] == '.' && i[2] == '/') {
- /* move also the \0 */
- memmove(i, i+2, strlen(i)-1);
- i--;
- }
- }
- if (!strcmp(path, ".") || !strcmp(path, "/.")) {
- *path = '\0';
- return 1;
- }
-
- /* 3. eliminate each inner .. along with the preceding non-.. */
- for (i = strstr(path, "../"); i != NULL; i = strstr(path, ".."))
- if (!path_elide_dotdot(path, i, 3))
- return 0;
-
- /* 4. eliminate trailing ..*/
- if ((i = strstr(path, "..")) != NULL)
- if (!path_elide_dotdot(path, i, 2))
- return 0;
-
- return 1;
-}
-
-static int
-parse_query(struct parser *p)
-{
- p->parsed->query = p->iri;
- if (*p->iri == '\0')
- return 1;
-
- while (unreserved(*p->iri)
- || sub_delimiters(*p->iri)
- || *p->iri == '/'
- || *p->iri == '?'
- || *p->iri == ':'
- || *p->iri == '@'
- || valid_pct_encoded(p))
- p->iri++;
-
- if (p->err != NULL)
- return 0;
-
- if (*p->iri != '\0' && *p->iri != '#') {
- p->err = "illegal character in query";
- return 0;
- }
-
- if (*p->iri != '\0') {
- *p->iri = '\0';
- p->iri++;
- }
-
- return 1;
-}
-
-/* don't even bother */
-static int
-parse_fragment(struct parser *p)
-{
- p->parsed->fragment = p->iri;
- return 1;
-}
-
-/* XXX: is it too broad? */
-/* *(pchar / "/") */
-static int
-parse_path(struct parser *p)
-{
- char c;
-
- /* trim initial slashes */
- while (*p->iri == '/')
- p->iri++;
-
- p->parsed->path = p->iri;
- if (*p->iri == '\0') {
- p->parsed->query = p->parsed->fragment = p->iri;
- return 1;
- }
-
- while (unreserved(*p->iri)
- || sub_delimiters(*p->iri)
- || *p->iri == '/'
- || parse_pct_encoded(p))
- p->iri++;
-
- if (p->err != NULL)
- return 0;
-
- if (*p->iri != '\0' && *p->iri != '?' && *p->iri != '#') {
- p->err = "illegal character in path";
- return 0;
- }
-
- if (*p->iri != '\0') {
- c = *p->iri;
- *p->iri = '\0';
- p->iri++;
-
- if (c == '#') {
- if (!parse_fragment(p))
- return 0;
- } else
- if (!parse_query(p) || !parse_fragment(p))
- return 0;
- }
-
- if (!path_clean(p->parsed->path)) {
- p->err = "illegal path";
- return 0;
- }
-
- return 1;
-}
-
-int
-url_parse(const char *data, struct url *url, const char **err)
-{
- struct shallow_url u;
- struct parser p;
-
- memset(url, 0, sizeof(*url));
- memset(&p, 0, sizeof(p));
- memset(&u, 0, sizeof(u));
-
- strlcpy(p.buf, data, sizeof(p.buf));
- p.iri = p.buf;
- p.parsed = &u;
-
- if (!parse_scheme(&p) || !parse_authority(&p) || !parse_path(&p)) {
- *err = p.err;
- return 0;
- }
-
- /* XXX: hack around our not complete compliance with RFC 3986 */
- /* if (u.scheme != NULL) */
- strlcpy(url->scheme, "gemini", sizeof(url->scheme));
-
- if (u.host != NULL)
- strlcpy(url->host, u.host, sizeof(url->host));
- if (u.port != NULL)
- strlcpy(url->port, u.port, sizeof(url->port));
- if (u.path != NULL)
- strlcpy(url->path, u.path, sizeof(url->path));
- if (u.query != NULL)
- strlcpy(url->query, u.query, sizeof(url->query));
- if (u.fragment != NULL)
- strlcpy(url->fragment, u.fragment, sizeof(url->fragment));
-
- return 1;
-}
-
-int
-url_resolve_from(struct url *url, const char *str, const char **err)
-{
- char *marker, *query, *hash, *i;
-
- marker = strstr(str, "//");
- query = strchr(str, '?');
- hash = strchr(str, '#');
-
- /* full URL */
- if (marker != NULL
- && (query == NULL || marker < query)
- && (hash == NULL || marker < hash))
- return url_parse(str, url, err);
-
- /* TODO: reuse more of the above */
-
- /* absolute url */
- if (*str == '/') {
- strlcpy(url->path, str, sizeof(url->path));
-
- if ((hash = strchr(url->path, '#')) != NULL) {
- *hash = '\0';
- hash++;
- strlcpy(url->fragment, hash,
- sizeof(url->fragment));
- }
-
- if ((query = strchr(url->path, '?')) != NULL) {
- *query = '\0';
- query++;
- strlcpy(url->query, query,
- sizeof(url->query));
- }
- return 1;
- }
-
- /* local url */
- for (i = strchr(url->path, '\0'); i >= url->path; --i) {
- if (*i == '/')
- break;
- }
-
- if (*i == '/')
- i++;
- *i = '\0';
-
- strlcat(url->path, str, sizeof(url->path));
- return 1;
-}
-
-int
-url_set_query(struct url *url, const char *query)
-{
- /* TODO: pct-encode! */
- memcpy(&url->query, query, strlen(query)+1);
- return 1;
-}
-
-void
-url_unparse(struct url *url, char *buf, size_t len)
-{
- strlcpy(buf, url->scheme, len);
- strlcat(buf, "://", len);
- strlcat(buf, url->host, len);
-
- if (*url->path == '\0' && *url->query == '\0')
- return;
-
- strlcat(buf, "/", len);
-
- if (*url->path != '\0')
- strlcat(buf, url->path, len);
- if (*url->query != '\0') {
- strlcat(buf, "?", len);
- strlcat(buf, url->query, len);
- }
-}
blob - 9faa9b4461810bd37a108c882ed890be35667b27 (mode 644)
blob + /dev/null
--- url.h
+++ /dev/null
-/*
- * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-#include <netdb.h>
-#include <stddef.h>
-
-#define GEMINI_URL_LEN 1024
-
-/* +1 for NUL */
-struct url {
- char scheme[32];
- char host[NI_MAXHOST+1];
- char port[NI_MAXSERV+1];
- char path[GEMINI_URL_LEN+1];
- char query[GEMINI_URL_LEN+1];
- char fragment[GEMINI_URL_LEN+1];
-};
-
-int url_parse(const char*, struct url*, const char**);
-int url_resolve_from(struct url*, const char*, const char**);
-int url_set_query(struct url*, const char*);
-void url_unparse(struct url*, char*, size_t);
