💾 Archived View for gmn.clttr.info › sources › cgmnlm.git › tree › src › url.c.txt captured on 2023-03-20 at 18:53:42.
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/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at https://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ***************************************************************************/ #define MAX_SCHEME_LEN 8 #include <assert.h> #include <ctype.h> #include <stdarg.h> #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include "escape.h" #include <gmni/url.h> /* Provided by gmni */ static char * aprintf(const char *fmt, ...) { va_list ap; va_start(ap, fmt); int n = vsnprintf(NULL, 0, fmt, ap); va_end(ap); char *strp = calloc(n + 1, 1); assert(strp); va_start(ap, fmt); n = vsnprintf(strp, n + 1, fmt, ap); va_end(ap); return strp; } /* via lib/dotdot.c */ char *Curl_dedotdotify(const char *input) { size_t inlen = strlen(input); char *clone; size_t clen = inlen; /* the length of the cloned input */ char *out = malloc(inlen + 1); char *outptr; char *orgclone; char *queryp; if(!out) return NULL; /* out of memory */ *out = 0; /* zero terminates, for inputs like "./" */ /* get a cloned copy of the input */ clone = strdup(input); if(!clone) { free(out); return NULL; } orgclone = clone; outptr = out; if(!*clone) { /* zero length string, return that */ free(out); return clone; } /* * To handle query-parts properly, we must find it and remove it during the * dotdot-operation and then append it again at the end to the output * string. */ queryp = strchr(clone, '?'); if(queryp) *queryp = 0; do { /* A. If the input buffer begins with a prefix of "../" or "./", then remove that prefix from the input buffer; otherwise, */ if(!strncmp("./", clone, 2)) { clone += 2; clen -= 2; } else if(!strncmp("../", clone, 3)) { clone += 3; clen -= 3; } /* B. if the input buffer begins with a prefix of "/./" or "/.", where "." is a complete path segment, then replace that prefix with "/" in the input buffer; otherwise, */ else if(!strncmp("/./", clone, 3)) { clone += 2; clen -= 2; } else if(!strcmp("/.", clone)) { clone[1]='/'; clone++; clen -= 1; } /* C. if the input buffer begins with a prefix of "/../" or "/..", where ".." is a complete path segment, then replace that prefix with "/" in the input buffer and remove the last segment and its preceding "/" (if any) from the output buffer; otherwise, */ else if(!strncmp("/../", clone, 4)) { clone += 3; clen -= 3; /* remove the last segment from the output buffer */ while(outptr > out) { outptr--; if(*outptr == '/') break; } *outptr = 0; /* zero-terminate where it stops */ } else if(!strcmp("/..", clone)) { clone[2]='/'; clone += 2; clen -= 2; /* remove the last segment from the output buffer */ while(outptr > out) { outptr--; if(*outptr == '/') break; } *outptr = 0; /* zero-terminate where it stops */ } /* D. if the input buffer consists only of "." or "..", then remove that from the input buffer; otherwise, */ else if(!strcmp(".", clone) || !strcmp("..", clone)) { *clone = 0; *out = 0; } else { /* E. move the first path segment in the input buffer to the end of the output buffer, including the initial "/" character (if any) and any subsequent characters up to, but not including, the next "/" character or the end of the input buffer. */ do { *outptr++ = *clone++; clen--; } while(*clone && (*clone != '/')); *outptr = 0; } } while(*clone); if(queryp) { size_t qlen; /* There was a query part, append that to the output. The 'clone' string may now have been altered so we copy from the original input string from the correct index. */ size_t oindex = queryp - orgclone; qlen = strlen(&input[oindex]); memcpy(outptr, &input[oindex], qlen + 1); /* include the end zero byte */ } free(orgclone); return out; } /* via lib/url.c */ CURLcode Curl_parse_login_details(const char *login, const size_t len, char **userp, char **passwdp, char **optionsp) { CURLcode result = CURLE_OK; char *ubuf = NULL; char *pbuf = NULL; char *obuf = NULL; const char *psep = NULL; const char *osep = NULL; size_t ulen; size_t plen; size_t olen; /* Attempt to find the password separator */ if(passwdp) { psep = strchr(login, ':'); /* Within the constraint of the login string */ if(psep >= login + len) psep = NULL; } /* Attempt to find the options separator */ if(optionsp) { osep = strchr(login, ';'); /* Within the constraint of the login string */ if(osep >= login + len) osep = NULL; } /* Calculate the portion lengths */ ulen = (psep ? (size_t)(osep && psep > osep ? osep - login : psep - login) : (osep ? (size_t)(osep - login) : len)); plen = (psep ? (osep && osep > psep ? (size_t)(osep - psep) : (size_t)(login + len - psep)) - 1 : 0); olen = (osep ? (psep && psep > osep ? (size_t)(psep - osep) : (size_t)(login + len - osep)) - 1 : 0); /* Allocate the user portion buffer */ if(userp && ulen) { ubuf = malloc(ulen + 1); if(!ubuf) result = CURLE_OUT_OF_MEMORY; } /* Allocate the password portion buffer */ if(!result && passwdp && plen) { pbuf = malloc(plen + 1); if(!pbuf) { free(ubuf); result = CURLE_OUT_OF_MEMORY; } } /* Allocate the options portion buffer */ if(!result && optionsp && olen) { obuf = malloc(olen + 1); if(!obuf) { free(pbuf); free(ubuf); result = CURLE_OUT_OF_MEMORY; } } if(!result) { /* Store the user portion if necessary */ if(ubuf) { memcpy(ubuf, login, ulen); ubuf[ulen] = '\0'; free(*userp); *userp = ubuf; } /* Store the password portion if necessary */ if(pbuf) { memcpy(pbuf, psep + 1, plen); pbuf[plen] = '\0'; free(*passwdp); *passwdp = pbuf; } /* Store the options portion if necessary */ if(obuf) { memcpy(obuf, osep + 1, olen); obuf[olen] = '\0'; free(*optionsp); *optionsp = obuf; } } return result; } /* Internal representation of CURLU. Point to URL-encoded strings. */ struct Curl_URL { char *scheme; char *user; char *password; char *options; /* IMAP only? */ char *host; char *port; char *path; char *query; char *fragment; char *scratch; /* temporary scratch area */ long portnum; /* the numerical version */ }; #define DEFAULT_SCHEME "https" static void free_urlhandle(struct Curl_URL *u) { free(u->scheme); free(u->user); free(u->password); free(u->options); free(u->host); free(u->port); free(u->path); free(u->query); free(u->fragment); free(u->scratch); } /* move the full contents of one handle onto another and free the original */ static void mv_urlhandle(struct Curl_URL *from, struct Curl_URL *to) { free_urlhandle(to); *to = *from; free(from); } /* * Find the separator at the end of the host name, or the '?' in cases like * http://www.url.com?id=2380 */ static const char *find_host_sep(const char *url) { const char *sep; const char *query; /* Find the start of the hostname */ sep = strstr(url, "//"); if(!sep) sep = url; else sep += 2; query = strchr(sep, '?'); sep = strchr(sep, '/'); if(!sep) sep = url + strlen(url); if(!query) query = url + strlen(url); return sep < query ? sep : query; } /* * Decide in an encoding-independent manner whether a character in an * URL must be escaped. The same criterion must be used in strlen_url() * and strcpy_url(). */ static bool urlchar_needs_escaping(int c) { return !(iscntrl(c) || isspace(c) || isgraph(c)); } /* * strlen_url() returns the length of the given URL if the spaces within the * URL were properly URL encoded. * URL encoding should be skipped for host names, otherwise IDN resolution * will fail. */ size_t Curl_strlen_url(const char *url, bool relative) { const unsigned char *ptr; size_t newlen = 0; bool left = true; /* left side of the ? */ const unsigned char *host_sep = (const unsigned char *) url; if(!relative) host_sep = (const unsigned char *) find_host_sep(url); for(ptr = (unsigned char *)url; *ptr; ptr++) { if(ptr < host_sep) { ++newlen; continue; } switch(*ptr) { case '?': left = false; /* FALLTHROUGH */ default: if(urlchar_needs_escaping(*ptr)) newlen += 2; newlen++; break; case ' ': if(left) newlen += 3; else newlen++; break; } } return newlen; } /* strcpy_url() copies a url to a output buffer and URL-encodes the spaces in * the source URL accordingly. * URL encoding should be skipped for host names, otherwise IDN resolution * will fail. */ void Curl_strcpy_url(char *output, const char *url, bool relative) { /* we must add this with whitespace-replacing */ bool left = true; const unsigned char *iptr; char *optr = output; const unsigned char *host_sep = (const unsigned char *) url; if(!relative) host_sep = (const unsigned char *) find_host_sep(url); for(iptr = (unsigned char *)url; /* read from here */ *iptr; /* until zero byte */ iptr++) { if(iptr < host_sep) { *optr++ = *iptr; continue; } switch(*iptr) { case '?': left = false; /* FALLTHROUGH */ default: if(urlchar_needs_escaping(*iptr)) { snprintf(optr, 4, "%%%02x", *iptr); optr += 3; } else *optr++=*iptr; break; case ' ': if(left) { *optr++='%'; /* add a '%' */ *optr++='2'; /* add a '2' */ *optr++='0'; /* add a '0' */ } else *optr++='+'; /* add a '+' here */ break; } } *optr = 0; /* zero terminate output buffer */ } /* * Returns true if the given URL is absolute (as opposed to relative) within * the buffer size. Returns the scheme in the buffer if true and 'buf' is * non-NULL. */ bool Curl_is_absolute_url(const char *url, char *buf, size_t buflen) { size_t i; for(i = 0; i < buflen && url[i]; ++i) { char s = url[i]; if((s == ':') && (url[i + 1] == '/')) { if(buf) buf[i] = 0; return true; } /* RFC 3986 3.1 explains: scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) */ else if(isalnum(s) || (s == '+') || (s == '-') || (s == '.') ) { if(buf) buf[i] = (char)tolower(s); } else break; } return false; } /* * Concatenate a relative URL to a base URL making it absolute. * URL-encodes any spaces. * The returned pointer must be freed by the caller unless NULL * (returns NULL on out of memory). */ char *Curl_concat_url(const char *base, const char *relurl) { /*** TRY to append this new path to the old URL to the right of the host part. Oh crap, this is doomed to cause problems in the future... */ char *newest; char *protsep; char *pathsep; size_t newlen; bool host_changed = false; const char *useurl = relurl; size_t urllen; /* we must make our own copy of the URL to play with, as it may point to read-only data */ char *url_clone = strdup(base); if(!url_clone) return NULL; /* skip out of this NOW */ /* protsep points to the start of the host name */ protsep = strstr(url_clone, "//"); if(!protsep) protsep = url_clone; else protsep += 2; /* pass the slashes */ if('/' != relurl[0]) { int level = 0; /* First we need to find out if there's a ?-letter in the URL, and cut it and the right-side of that off */ pathsep = strchr(protsep, '?'); if(pathsep) *pathsep = 0; /* we have a relative path to append to the last slash if there's one available, or if the new URL is just a query string (starts with a '?') we append the new one at the end of the entire currently worked out URL */ if(useurl[0] != '?') { pathsep = strrchr(protsep, '/'); if(pathsep) *pathsep = 0; } /* Check if there's any slash after the host name, and if so, remember that position instead */ pathsep = strchr(protsep, '/'); if(pathsep) protsep = pathsep + 1; else protsep = NULL; /* now deal with one "./" or any amount of "../" in the newurl and act accordingly */ if((useurl[0] == '.') && (useurl[1] == '/')) useurl += 2; /* just skip the "./" */ while((useurl[0] == '.') && (useurl[1] == '.') && (useurl[2] == '/')) { level++; useurl += 3; /* pass the "../" */ } if(protsep) { while(level--) { /* cut off one more level from the right of the original URL */ pathsep = strrchr(protsep, '/'); if(pathsep) *pathsep = 0; else { *protsep = 0; break; } } } } else { /* We got a new absolute path for this server */ if((relurl[0] == '/') && (relurl[1] == '/')) { /* the new URL starts with //, just keep the protocol part from the original one */ *protsep = 0; useurl = &relurl[2]; /* we keep the slashes from the original, so we skip the new ones */ host_changed = true; } else { /* cut off the original URL from the first slash, or deal with URLs without slash */ pathsep = strchr(protsep, '/'); if(pathsep) { /* When people use badly formatted URLs, such as "http://www.url.com?dir=/home/daniel" we must not use the first slash, if there's a ?-letter before it! */ char *sep = strchr(protsep, '?'); if(sep && (sep < pathsep)) pathsep = sep; *pathsep = 0; } else { /* There was no slash. Now, since we might be operating on a badly formatted URL, such as "http://www.url.com?id=2380" which doesn't use a slash separator as it is supposed to, we need to check for a ?-letter as well! */ pathsep = strchr(protsep, '?'); if(pathsep) *pathsep = 0; } } } /* If the new part contains a space, this is a mighty stupid redirect but we still make an effort to do "right". To the left of a '?' letter we replace each space with %20 while it is replaced with '+' on the right side of the '?' letter. */ newlen = Curl_strlen_url(useurl, !host_changed); urllen = strlen(url_clone); newest = malloc(urllen + 1 + /* possible slash */ newlen + 1 /* zero byte */); if(!newest) { free(url_clone); /* don't leak this */ return NULL; } /* copy over the root url part */ memcpy(newest, url_clone, urllen); /* check if we need to append a slash */ if(('/' == useurl[0]) || (protsep && !*protsep) || ('?' == useurl[0])) ; else newest[urllen++]='/'; /* then append the new piece on the right side */ Curl_strcpy_url(&newest[urllen], useurl, !host_changed); free(url_clone); return newest; } /* * parse_hostname_login() * * Parse the login details (user name, password and options) from the URL and * strip them out of the host name * */ static CURLUcode parse_hostname_login(struct Curl_URL *u, char **hostname, unsigned int flags) { CURLUcode result = CURLUE_OK; CURLcode ccode; char *userp = NULL; char *passwdp = NULL; char *optionsp = NULL; /* At this point, we're hoping all the other special cases have * been taken care of, so conn->host.name is at most * [user[:password][;options]]@]hostname * * We need somewhere to put the embedded details, so do that first. */ char *ptr = strchr(*hostname, '@'); char *login = *hostname; if(!ptr) goto out; /* We will now try to extract the * possible login information in a string like: * ftp://user:password@ftp.my.site:8021/README */ *hostname = ++ptr; /* We could use the login information in the URL so extract it. Only parse options if the handler says we should. Note that 'h' might be NULL! */ ccode = Curl_parse_login_details(login, ptr - login - 1, &userp, &passwdp, NULL); if(ccode) { result = CURLUE_MALFORMED_INPUT; goto out; } if(userp) { if(flags & CURLU_DISALLOW_USER) { /* Option DISALLOW_USER is set and url contains username. */ result = CURLUE_USER_NOT_ALLOWED; goto out; } u->user = userp; } if(passwdp) u->password = passwdp; if(optionsp) u->options = optionsp; return CURLUE_OK; out: free(userp); free(passwdp); free(optionsp); return result; } static CURLUcode parse_port(struct Curl_URL *u, char *hostname) { char *portptr; char endbracket; int len; if((1 == sscanf(hostname, "[%*45[0123456789abcdefABCDEF:.%%]%c%n", &endbracket, &len)) && (']' == endbracket)) { /* this is a RFC2732-style specified IP-address */ portptr = &hostname[len]; if(*portptr) { if(*portptr != ':') return CURLUE_MALFORMED_INPUT; } else portptr = NULL; } else portptr = strchr(hostname, ':'); if(portptr) { char *rest; long port; char portbuf[7]; if(!isdigit(portptr[1])) return CURLUE_BAD_PORT_NUMBER; port = strtol(portptr + 1, &rest, 10); /* Port number must be decimal */ if((port <= 0) || (port > 0xffff)) /* Single unix standard says port numbers are 16 bits long, but we don't treat port zero as OK. */ return CURLUE_BAD_PORT_NUMBER; if(rest[0]) return CURLUE_BAD_PORT_NUMBER; if(rest != &portptr[1]) { *portptr++ = '\0'; /* cut off the name there */ *rest = 0; /* generate a new to get rid of leading zeroes etc */ snprintf(portbuf, sizeof(portbuf), "%ld", port); u->portnum = port; u->port = strdup(portbuf); if(!u->port) return CURLUE_OUT_OF_MEMORY; } else { /* Browser behavior adaptation. If there's a colon with no digits after, just cut off the name there which makes us ignore the colon and just use the default port. Firefox and Chrome both do that. */ *portptr = '\0'; } } return CURLUE_OK; } /* scan for byte values < 31 or 127 */ static CURLUcode junkscan(char *part) { char badbytes[]={ /* */ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x7f, 0x00 /* zero terminate */ }; if(part) { size_t n = strlen(part); size_t nfine = strcspn(part, badbytes); if(nfine != n) /* since we don't know which part is scanned, return a generic error code */ return CURLUE_MALFORMED_INPUT; } return CURLUE_OK; } static CURLUcode hostname_check(char *hostname, unsigned int flags) { const char *l = NULL; /* accepted characters */ size_t len; size_t hlen = strlen(hostname); (void)flags; if(hostname[0] == '[') { hostname++; l = "0123456789abcdefABCDEF::.%"; hlen -= 2; } if(l) { /* only valid letters are ok */ len = strspn(hostname, l); if(hlen != len) /* hostname with bad content */ return CURLUE_MALFORMED_INPUT; } else { /* letters from the second string is not ok */ len = strcspn(hostname, " "); if(hlen != len) /* hostname with bad content */ return CURLUE_MALFORMED_INPUT; } return CURLUE_OK; } #define HOSTNAME_END(x) (((x) == '/') || ((x) == '?') || ((x) == '#')) static CURLUcode seturl(const char *url, struct Curl_URL *u, unsigned int flags) { char *path; bool path_alloced = false; char *hostname; char *query = NULL; char *fragment = NULL; CURLUcode result; bool url_has_scheme = false; char schemebuf[MAX_SCHEME_LEN]; char *schemep = NULL; size_t schemelen = 0; size_t urllen; if(!url) return CURLUE_MALFORMED_INPUT; /************************************************************* * Parse the URL. ************************************************************/ /* allocate scratch area */ urllen = strlen(url); path = u->scratch = malloc(urllen * 2 + 2); if(!path) return CURLUE_OUT_OF_MEMORY; hostname = &path[urllen + 1]; hostname[0] = 0; if(Curl_is_absolute_url(url, schemebuf, sizeof(schemebuf))) { url_has_scheme = true; schemelen = strlen(schemebuf); } /* handle the file: scheme */ if(url_has_scheme && strcasecmp(schemebuf, "file") == 0) { /* path has been allocated large enough to hold this */ strcpy(path, &url[5]); hostname = NULL; /* no host for file: URLs */ u->scheme = strdup("file"); if(!u->scheme) return CURLUE_OUT_OF_MEMORY; /* Extra handling URLs with an authority component (i.e. that start with * "file://") * * We allow omitted hostname (e.g. file:/<path>) -- valid according to * RFC 8089, but not the (current) WHAT-WG URL spec. */ if(path[0] == '/' && path[1] == '/') { /* swallow the two slashes */ char *ptr = &path[2]; path = ptr; } } else { /* clear path */ const char *p; const char *hostp; size_t len; path[0] = 0; if(url_has_scheme) { int i = 0; p = &url[schemelen + 1]; while(p && (*p == '/') && (i < 4)) { p++; i++; } if((i < 1) || (i>3)) /* less than one or more than three slashes */ return CURLUE_MALFORMED_INPUT; schemep = schemebuf; if(junkscan(schemep)) return CURLUE_MALFORMED_INPUT; } else { /* no scheme! */ return CURLUE_MALFORMED_INPUT; } hostp = p; /* host name starts here */ while(*p && !HOSTNAME_END(*p)) /* find end of host name */ p++; len = p - hostp; if(!len) return CURLUE_MALFORMED_INPUT; memcpy(hostname, hostp, len); hostname[len] = 0; len = strlen(p); memcpy(path, p, len); path[len] = 0; u->scheme = strdup(schemep); if(!u->scheme) return CURLUE_OUT_OF_MEMORY; } if(junkscan(path)) return CURLUE_MALFORMED_INPUT; query = strchr(path, '?'); if(query) *query++ = 0; fragment = strchr(query?query:path, '#'); if(fragment) *fragment++ = 0; if(!path[0]) /* if there's no path set, unset */ path = NULL; else if(!(flags & CURLU_PATH_AS_IS)) { /* sanitise paths and remove ../ and ./ sequences according to RFC3986 */ char *newp = Curl_dedotdotify(path); if(!newp) return CURLUE_OUT_OF_MEMORY; if(strcmp(newp, path)) { /* if we got a new version */ path = newp; path_alloced = true; } else free(newp); } if(path) { u->path = path_alloced?path:strdup(path); if(!u->path) return CURLUE_OUT_OF_MEMORY; } if(hostname) { /* * Parse the login details and strip them out of the host name. */ if(junkscan(hostname)) return CURLUE_MALFORMED_INPUT; result = parse_hostname_login(u, &hostname, flags); if(result) return result; result = parse_port(u, hostname); if(result) return result; result = hostname_check(hostname, flags); if(result) return result; u->host = strdup(hostname); if(!u->host) return CURLUE_OUT_OF_MEMORY; } if(query && query[0]) { u->query = strdup(query); if(!u->query) return CURLUE_OUT_OF_MEMORY; } if(fragment && fragment[0]) { u->fragment = strdup(fragment); if(!u->fragment) return CURLUE_OUT_OF_MEMORY; } free(u->scratch); u->scratch = NULL; return CURLUE_OK; } /* * Parse the URL and set the relevant members of the Curl_URL struct. */ static CURLUcode parseurl(const char *url, struct Curl_URL *u, unsigned int flags) { CURLUcode result = seturl(url, u, flags); if(result) { free_urlhandle(u); memset(u, 0, sizeof(struct Curl_URL)); } return result; } /* */ struct Curl_URL *curl_url(void) { return calloc(sizeof(struct Curl_URL), 1); } void curl_url_cleanup(struct Curl_URL *u) { if(u) { free_urlhandle(u); free(u); } } #define DUP(dest, src, name) \ if(src->name) { \ dest->name = strdup(src->name); \ if(!dest->name) \ goto fail; \ } struct Curl_URL *curl_url_dup(struct Curl_URL *in) { struct Curl_URL *u = calloc(sizeof(struct Curl_URL), 1); if(u) { DUP(u, in, scheme); DUP(u, in, user); DUP(u, in, password); DUP(u, in, options); DUP(u, in, host); DUP(u, in, port); DUP(u, in, path); DUP(u, in, query); DUP(u, in, fragment); u->portnum = in->portnum; } return u; fail: curl_url_cleanup(u); return NULL; } CURLUcode curl_url_get(struct Curl_URL *u, CURLUPart what, char **part, unsigned int flags) { char *ptr; CURLUcode ifmissing = CURLUE_UNKNOWN_PART; bool urldecode = (flags & CURLU_URLDECODE)?1:0; bool plusdecode = false; (void)flags; if(!u) return CURLUE_BAD_HANDLE; if(!part) return CURLUE_BAD_PARTPOINTER; *part = NULL; switch(what) { case CURLUPART_SCHEME: ptr = u->scheme; ifmissing = CURLUE_NO_SCHEME; urldecode = false; /* never for schemes */ break; case CURLUPART_USER: ptr = u->user; ifmissing = CURLUE_NO_USER; break; case CURLUPART_PASSWORD: ptr = u->password; ifmissing = CURLUE_NO_PASSWORD; break; case CURLUPART_OPTIONS: ptr = u->options; ifmissing = CURLUE_NO_OPTIONS; break; case CURLUPART_HOST: ptr = u->host; ifmissing = CURLUE_NO_HOST; break; case CURLUPART_PORT: ptr = u->port; ifmissing = CURLUE_NO_PORT; urldecode = false; /* never for port */ break; case CURLUPART_PATH: ptr = u->path; if(!ptr) { ptr = u->path = strdup("/"); if(!u->path) return CURLUE_OUT_OF_MEMORY; } break; case CURLUPART_QUERY: ptr = u->query; ifmissing = CURLUE_NO_QUERY; plusdecode = urldecode; break; case CURLUPART_FRAGMENT: ptr = u->fragment; ifmissing = CURLUE_NO_FRAGMENT; break; case CURLUPART_URL: { char *url; char *scheme; char *options = u->options; char *port = u->port; if(u->scheme && strcasecmp("file", u->scheme) == 0) { url = aprintf("file://%s%s%s", u->path, u->fragment? "#": "", u->fragment? u->fragment : ""); } else if(!u->host) return CURLUE_NO_HOST; else { if(u->scheme) scheme = u->scheme; else return CURLUE_NO_SCHEME; options = NULL; url = aprintf("%s://%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s", scheme, u->user ? u->user : "", u->password ? ":": "", u->password ? u->password : "", options ? ";" : "", options ? options : "", (u->user || u->password || options) ? "@": "", u->host, port ? ":": "", port ? port : "", (u->path && (u->path[0] != '/')) ? "/": "", u->path ? u->path : "/", u->query? "?": "", u->query? u->query : "", u->fragment? "#": "", u->fragment? u->fragment : ""); } if(!url) return CURLUE_OUT_OF_MEMORY; *part = url; return CURLUE_OK; break; } default: ptr = NULL; } if(ptr) { *part = strdup(ptr); if(!*part) return CURLUE_OUT_OF_MEMORY; if(plusdecode) { /* convert + to space */ char *plus; for(plus = *part; *plus; ++plus) { if(*plus == '+') *plus = ' '; } } if(urldecode) { char *decoded; size_t dlen; CURLcode res = Curl_urldecode(*part, 0, &decoded, &dlen, true); free(*part); if(res) { *part = NULL; return CURLUE_URLDECODE; } *part = decoded; } return CURLUE_OK; } else return ifmissing; } CURLUcode curl_url_set(struct Curl_URL *u, CURLUPart what, const char *part, unsigned int flags) { char **storep = NULL; long port = 0; bool urlencode = (flags & CURLU_URLENCODE)? 1 : 0; bool plusencode = false; bool urlskipslash = false; bool appendquery = false; bool equalsencode = false; if(!u) return CURLUE_BAD_HANDLE; if(!part) { /* setting a part to NULL clears it */ switch(what) { case CURLUPART_URL: break; case CURLUPART_SCHEME: storep = &u->scheme; break; case CURLUPART_USER: storep = &u->user; break; case CURLUPART_PASSWORD: storep = &u->password; break; case CURLUPART_OPTIONS: storep = &u->options; break; case CURLUPART_HOST: storep = &u->host; break; case CURLUPART_PORT: storep = &u->port; break; case CURLUPART_PATH: storep = &u->path; break; case CURLUPART_QUERY: storep = &u->query; break; case CURLUPART_FRAGMENT: storep = &u->fragment; break; default: return CURLUE_UNKNOWN_PART; } if(storep && *storep) { free(*storep); *storep = NULL; } return CURLUE_OK; } switch(what) { case CURLUPART_SCHEME: storep = &u->scheme; urlencode = false; /* never */ break; case CURLUPART_USER: storep = &u->user; break; case CURLUPART_PASSWORD: storep = &u->password; break; case CURLUPART_OPTIONS: storep = &u->options; break; case CURLUPART_HOST: storep = &u->host; break; case CURLUPART_PORT: urlencode = false; /* never */ port = strtol(part, NULL, 10); /* Port number must be decimal */ if((port <= 0) || (port > 0xffff)) return CURLUE_BAD_PORT_NUMBER; storep = &u->port; break; case CURLUPART_PATH: urlskipslash = true; storep = &u->path; break; case CURLUPART_QUERY: plusencode = urlencode; appendquery = (flags & CURLU_APPENDQUERY)?1:0; equalsencode = appendquery; storep = &u->query; break; case CURLUPART_FRAGMENT: storep = &u->fragment; break; case CURLUPART_URL: { /* * Allow a new URL to replace the existing (if any) contents. * * If the existing contents is enough for a URL, allow a relative URL to * replace it. */ CURLUcode result; char *oldurl; char *redired_url; struct Curl_URL *handle2; if(Curl_is_absolute_url(part, NULL, MAX_SCHEME_LEN)) { handle2 = curl_url(); if(!handle2) return CURLUE_OUT_OF_MEMORY; result = parseurl(part, handle2, flags); if(!result) mv_urlhandle(handle2, u); else curl_url_cleanup(handle2); return result; } /* extract the full "old" URL to do the redirect on */ result = curl_url_get(u, CURLUPART_URL, &oldurl, flags); if(result) { /* couldn't get the old URL, just use the new! */ handle2 = curl_url(); if(!handle2) return CURLUE_OUT_OF_MEMORY; result = parseurl(part, handle2, flags); if(!result) mv_urlhandle(handle2, u); else curl_url_cleanup(handle2); return result; } /* apply the relative part to create a new URL */ redired_url = Curl_concat_url(oldurl, part); free(oldurl); if(!redired_url) return CURLUE_OUT_OF_MEMORY; /* now parse the new URL */ handle2 = curl_url(); if(!handle2) { free(redired_url); return CURLUE_OUT_OF_MEMORY; } result = parseurl(redired_url, handle2, flags); free(redired_url); if(!result) mv_urlhandle(handle2, u); else curl_url_cleanup(handle2); return result; } default: return CURLUE_UNKNOWN_PART; } if(storep) { const char *newp = part; size_t nalloc = strlen(part); if(urlencode) { const char *i; char *o; bool free_part = false; char *enc = malloc(nalloc * 3 + 1); /* for worst case! */ if(!enc) return CURLUE_OUT_OF_MEMORY; for(i = part, o = enc; *i; i++) { if(Curl_isunreserved(*i) || ((*i == '/') && urlskipslash) || ((*i == '=') && equalsencode) || ((*i == '+') && plusencode)) { if((*i == '=') && equalsencode) /* only skip the first equals sign */ equalsencode = false; *o = *i; o++; } else { snprintf(o, 4, "%%%02x", *i); o += 3; } } *o = 0; /* zero terminate */ newp = enc; if(free_part) free((char *)part); } else { char *p; newp = strdup(part); if(!newp) return CURLUE_OUT_OF_MEMORY; p = (char *)newp; while(*p) { /* make sure percent encoded are lower case */ if((*p == '%') && isxdigit(p[1]) && isxdigit(p[2]) && (isupper(p[1]) || isupper(p[2]))) { p[1] = (char)tolower(p[1]); p[2] = (char)tolower(p[2]); p += 3; } else p++; } } if(appendquery) { /* Append the string onto the old query. Add a '&' separator if none is present at the end of the exsting query already */ size_t querylen = u->query ? strlen(u->query) : 0; bool addamperand = querylen && (u->query[querylen -1] != '&'); if(querylen) { size_t newplen = strlen(newp); char *p = malloc(querylen + addamperand + newplen + 1); if(!p) { free((char *)newp); return CURLUE_OUT_OF_MEMORY; } strcpy(p, u->query); /* original query */ if(addamperand) p[querylen] = '&'; /* ampersand */ strcpy(&p[querylen + addamperand], newp); /* new suffix */ free((char *)newp); free(*storep); *storep = p; return CURLUE_OK; } } free(*storep); *storep = (char *)newp; } /* set after the string, to make it not assigned if the allocation above fails */ if(port) u->portnum = port; return CURLUE_OK; }