e44b500484
This way journalctl can make use of libqrencode if it's there, but will quietly not use it if it isn't. This means libqrencode remains a build-time dep, but not a strict runtime dependency. I figure we should do something similar for a bunch of other "leaf" libraries we only use few symbols of. Specifically the following are probably good candidates: * pcre2 * libpwquality * p11kit * elfutils and possibly: * libcryptsetup (only in some parts. i.e. building systemd-cryptsetup without it makes no sense. However building the dissect option with libcryptsetup as optional dep does make sense) * possibly the compression libraries (at least the ones we never use for compression, but only as alternative ones for decompression) Already covered like this is: * libxkcommon
147 lines
4.2 KiB
C
147 lines
4.2 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <qrencode.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "alloc-util.h"
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#include "dlfcn-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "journal-qrcode.h"
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#include "locale-util.h"
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#include "macro.h"
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#include "terminal-util.h"
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#define ANSI_WHITE_ON_BLACK "\033[40;37;1m"
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static void print_border(FILE *output, unsigned width) {
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unsigned x, y;
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/* Four rows of border */
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for (y = 0; y < 4; y += 2) {
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fputs(ANSI_WHITE_ON_BLACK, output);
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for (x = 0; x < 4 + width + 4; x++)
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fputs("\342\226\210", output);
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fputs(ANSI_NORMAL "\n", output);
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}
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}
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int print_qr_code(
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FILE *output,
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const char *prefix_text,
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const void *seed,
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size_t seed_size,
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uint64_t start,
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uint64_t interval,
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const char *hn,
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sd_id128_t machine) {
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QRcode* (*sym_QRcode_encodeString)(const char *string, int version, QRecLevel level, QRencodeMode hint, int casesensitive);
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void (*sym_QRcode_free)(QRcode *qrcode);
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_cleanup_(dlclosep) void *dl = NULL;
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_cleanup_free_ char *url = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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size_t url_size = 0, i;
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unsigned x, y;
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QRcode* qr;
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int r;
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assert(seed);
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assert(seed_size > 0);
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/* If this is not an UTF-8 system or ANSI colors aren't supported/disabled don't print any QR
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* codes */
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if (!is_locale_utf8() || !colors_enabled())
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return -EOPNOTSUPP;
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dl = dlopen("libqrencode.so.4", RTLD_LAZY);
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if (!dl)
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return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
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"QRCODE support is not installed: %s", dlerror());
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r = dlsym_many_and_warn(
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dl,
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LOG_DEBUG,
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&sym_QRcode_encodeString, "QRcode_encodeString",
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&sym_QRcode_free, "QRcode_free",
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NULL);
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if (r < 0)
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return r;
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f = open_memstream_unlocked(&url, &url_size);
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if (!f)
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return -ENOMEM;
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fputs("fss://", f);
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for (i = 0; i < seed_size; i++) {
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if (i > 0 && i % 3 == 0)
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fputc('-', f);
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fprintf(f, "%02x", ((uint8_t*) seed)[i]);
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}
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fprintf(f, "/%"PRIx64"-%"PRIx64"?machine=" SD_ID128_FORMAT_STR,
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start,
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interval,
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SD_ID128_FORMAT_VAL(machine));
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if (hn)
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fprintf(f, ";hostname=%s", hn);
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r = fflush_and_check(f);
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if (r < 0)
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return r;
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f = safe_fclose(f);
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qr = sym_QRcode_encodeString(url, 0, QR_ECLEVEL_L, QR_MODE_8, 1);
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if (!qr)
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return -ENOMEM;
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if (prefix_text)
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fputs(prefix_text, output);
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print_border(output, qr->width);
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for (y = 0; y < (unsigned) qr->width; y += 2) {
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const uint8_t *row1, *row2;
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row1 = qr->data + qr->width * y;
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row2 = row1 + qr->width;
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fputs(ANSI_WHITE_ON_BLACK, output);
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for (x = 0; x < 4; x++)
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fputs("\342\226\210", output);
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for (x = 0; x < (unsigned) qr->width; x ++) {
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bool a, b;
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a = row1[x] & 1;
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b = (y+1) < (unsigned) qr->width ? (row2[x] & 1) : false;
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if (a && b)
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fputc(' ', output);
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else if (a)
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fputs("\342\226\204", output);
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else if (b)
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fputs("\342\226\200", output);
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else
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fputs("\342\226\210", output);
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}
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for (x = 0; x < 4; x++)
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fputs("\342\226\210", output);
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fputs(ANSI_NORMAL "\n", output);
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}
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print_border(output, qr->width);
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sym_QRcode_free(qr);
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return 0;
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}
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