mirror of
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3aa3cc9b05
Generate alphanumerical random strings. Prior this change curl used to create random hex strings. This was mostly okay, but having alphanumerical random strings is better: The strings have more entropy in the same space. The MIME multipart boundary used to be mere 64-bits of randomness due to being 16 hex chars. With these changes the boundary is 22 alphanumerical chars, or little over 130 bits of randomness. Closes #11838
175 lines
7.2 KiB
C
175 lines
7.2 KiB
C
#ifndef HEADER_CURL_MIME_H
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#define HEADER_CURL_MIME_H
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#define MIME_BOUNDARY_DASHES 24 /* leading boundary dashes */
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#define MIME_RAND_BOUNDARY_CHARS 22 /* Nb. of random boundary chars. */
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#define MAX_ENCODED_LINE_LENGTH 76 /* Maximum encoded line length. */
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#define ENCODING_BUFFER_SIZE 256 /* Encoding temp buffers size. */
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/* Part flags. */
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#define MIME_USERHEADERS_OWNER (1 << 0)
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#define MIME_BODY_ONLY (1 << 1)
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#define MIME_FAST_READ (1 << 2)
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#define FILE_CONTENTTYPE_DEFAULT "application/octet-stream"
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#define MULTIPART_CONTENTTYPE_DEFAULT "multipart/mixed"
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#define DISPOSITION_DEFAULT "attachment"
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/* Part source kinds. */
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enum mimekind {
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MIMEKIND_NONE = 0, /* Part not set. */
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MIMEKIND_DATA, /* Allocated mime data. */
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MIMEKIND_FILE, /* Data from file. */
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MIMEKIND_CALLBACK, /* Data from `read' callback. */
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MIMEKIND_MULTIPART, /* Data is a mime subpart. */
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MIMEKIND_LAST
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};
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/* Readback state tokens. */
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enum mimestate {
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MIMESTATE_BEGIN, /* Readback has not yet started. */
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MIMESTATE_CURLHEADERS, /* In curl-generated headers. */
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MIMESTATE_USERHEADERS, /* In caller's supplied headers. */
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MIMESTATE_EOH, /* End of headers. */
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MIMESTATE_BODY, /* Placeholder. */
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MIMESTATE_BOUNDARY1, /* In boundary prefix. */
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MIMESTATE_BOUNDARY2, /* In boundary. */
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MIMESTATE_CONTENT, /* In content. */
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MIMESTATE_END, /* End of part reached. */
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MIMESTATE_LAST
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};
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/* Mime headers strategies. */
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enum mimestrategy {
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MIMESTRATEGY_MAIL, /* Mime mail. */
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MIMESTRATEGY_FORM, /* HTTP post form. */
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MIMESTRATEGY_LAST
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};
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/* Content transfer encoder. */
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struct mime_encoder {
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const char * name; /* Encoding name. */
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size_t (*encodefunc)(char *buffer, size_t size, bool ateof,
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curl_mimepart *part); /* Encoded read. */
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curl_off_t (*sizefunc)(curl_mimepart *part); /* Encoded size. */
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};
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/* Content transfer encoder state. */
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struct mime_encoder_state {
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size_t pos; /* Position on output line. */
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size_t bufbeg; /* Next data index in input buffer. */
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size_t bufend; /* First unused byte index in input buffer. */
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char buf[ENCODING_BUFFER_SIZE]; /* Input buffer. */
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};
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/* Mime readback state. */
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struct mime_state {
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enum mimestate state; /* Current state token. */
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void *ptr; /* State-dependent pointer. */
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curl_off_t offset; /* State-dependent offset. */
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};
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/* Boundary string length. */
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#define MIME_BOUNDARY_LEN (MIME_BOUNDARY_DASHES + MIME_RAND_BOUNDARY_CHARS)
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/* A mime multipart. */
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struct curl_mime {
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curl_mimepart *parent; /* Parent part. */
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curl_mimepart *firstpart; /* First part. */
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curl_mimepart *lastpart; /* Last part. */
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char boundary[MIME_BOUNDARY_LEN + 1]; /* The part boundary. */
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struct mime_state state; /* Current readback state. */
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};
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/* A mime part. */
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struct curl_mimepart {
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curl_mime *parent; /* Parent mime structure. */
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curl_mimepart *nextpart; /* Forward linked list. */
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enum mimekind kind; /* The part kind. */
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unsigned int flags; /* Flags. */
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char *data; /* Memory data or file name. */
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curl_read_callback readfunc; /* Read function. */
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curl_seek_callback seekfunc; /* Seek function. */
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curl_free_callback freefunc; /* Argument free function. */
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void *arg; /* Argument to callback functions. */
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FILE *fp; /* File pointer. */
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struct curl_slist *curlheaders; /* Part headers. */
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struct curl_slist *userheaders; /* Part headers. */
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char *mimetype; /* Part mime type. */
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char *filename; /* Remote file name. */
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char *name; /* Data name. */
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curl_off_t datasize; /* Expected data size. */
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struct mime_state state; /* Current readback state. */
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const struct mime_encoder *encoder; /* Content data encoder. */
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struct mime_encoder_state encstate; /* Data encoder state. */
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size_t lastreadstatus; /* Last read callback returned status. */
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};
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CURLcode Curl_mime_add_header(struct curl_slist **slp, const char *fmt, ...);
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#if !defined(CURL_DISABLE_MIME) && (!defined(CURL_DISABLE_HTTP) || \
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!defined(CURL_DISABLE_SMTP) || \
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!defined(CURL_DISABLE_IMAP))
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/* Prototypes. */
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void Curl_mime_initpart(struct curl_mimepart *part);
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void Curl_mime_cleanpart(struct curl_mimepart *part);
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CURLcode Curl_mime_duppart(struct Curl_easy *data,
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struct curl_mimepart *dst,
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const curl_mimepart *src);
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CURLcode Curl_mime_set_subparts(struct curl_mimepart *part,
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struct curl_mime *subparts,
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int take_ownership);
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CURLcode Curl_mime_prepare_headers(struct Curl_easy *data,
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struct curl_mimepart *part,
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const char *contenttype,
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const char *disposition,
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enum mimestrategy strategy);
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curl_off_t Curl_mime_size(struct curl_mimepart *part);
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size_t Curl_mime_read(char *buffer, size_t size, size_t nitems,
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void *instream);
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CURLcode Curl_mime_rewind(struct curl_mimepart *part);
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const char *Curl_mime_contenttype(const char *filename);
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void Curl_mime_unpause(struct curl_mimepart *part);
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#else
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/* if disabled */
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#define Curl_mime_initpart(x)
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#define Curl_mime_cleanpart(x)
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#define Curl_mime_duppart(x,y,z) CURLE_OK /* Nothing to duplicate. Succeed */
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#define Curl_mime_set_subparts(a,b,c) CURLE_NOT_BUILT_IN
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#define Curl_mime_prepare_headers(a,b,c,d,e) CURLE_NOT_BUILT_IN
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#define Curl_mime_size(x) (curl_off_t) -1
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#define Curl_mime_read NULL
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#define Curl_mime_rewind(x) ((void)x, CURLE_NOT_BUILT_IN)
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#define Curl_mime_unpause(x)
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#endif
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#endif /* HEADER_CURL_MIME_H */
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