Add support for linking against wolfSSL provided by wolfssl-sys

[pulsastrix]

This PR allows the vendored version of libcoap to link against the version of wolfSSL that is used by the wolfssl-sys crate.
This change required some modifications to wolfssl-sys in order to expose the library paths to us and enable features necessary for libcoap, which is why it currently uses our own fork of wolfssl-sys.

Closes #29.

[github-actions]

Workflow Status Report

Generated for commit 9af4237 on Tue Mar 4 15:01:48 UTC 2025.

In case of failure, clippy warnings and rustfmt changes (if any) will be indicated as CI check warnings in the file comparison view.

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Code Coverage Report

Coverage target is 80%.

Expand to view coverage statistics

file	coverage	covered	missed_lines
libcoap-sys/src/lib.rs	84.06%	211 / 251	372-383, 494, 502, 529-546, 671-674, 758-761
libcoap/src/context.rs	61.50%	230 / 374	107, 168-213, 223-230, 247, 276, 323-326, 360, 375-377, 442, 447, 463, 471-633
libcoap/src/crypto/pki_rpk/key.rs	56.67%	51 / 90	179-218, 242-250, 252-255, 261-263
libcoap/src/crypto/pki_rpk/mod.rs	21.90%	99 / 452	36-279, 454-486, 507-605, 613, 616, 650-668, 678-680, 685-687, 692-694, 755, 767-903
libcoap/src/crypto/pki_rpk/pki.rs	78.08%	114 / 146	90-149, 302-315
libcoap/src/crypto/pki_rpk/rpk.rs	72.60%	53 / 73	68-98, 160-171
libcoap/src/crypto/psk/client.rs	45.59%	62 / 136	71-75, 83, 106-192, 234-242, 269-271, 276-278, 306-338
libcoap/src/crypto/psk/key.rs	61.46%	59 / 96	42-49, 163-205
libcoap/src/crypto/psk/mod.rs	0.00%	0 / 45	30-100
libcoap/src/crypto/psk/server.rs	30.54%	51 / 167	69-88, 96, 99, 116-119, 145-147, 152-154, 159-161, 189-234, 255, 271-396
libcoap/src/error.rs	0.00%	0 / 6	90-170
libcoap/src/event.rs	29.73%	11 / 37	36-168
libcoap/src/lib.rs	0.00%	0 / 64	62-165
libcoap/src/mem.rs	72.89%	121 / 166	148-163, 196-198, 210-212, 280, 296-298, 319-324, 353-355, 369, 381-393, 454-456, 473, 481-488, 507, 527, 531
libcoap/src/message/mod.rs	58.46%	190 / 325	105-108, 110-131, 139-145, 147-168, 172, 174, 176, 208, 210, 213-222, 225-243, 245-249, 265-275, 295-302, 398, 441, 447, 478, 488-491, 497-499, 506, 511-523, 529, 549-551, 561-563
libcoap/src/message/request.rs	34.12%	101 / 296	51, 68-202, 228-256, 264-365, 371-375, 380-381, 383-386, 389, 395-401, 430-432, 436, 439-441, 444-446, 449, 452, 455, 458, 461, 472-479
libcoap/src/message/response.rs	22.17%	45 / 203	36-160, 165, 168, 171, 174, 177, 195-325, 329-334, 360
libcoap/src/prng.rs	55.41%	41 / 74	66, 78-116, 139-149, 196
libcoap/src/protocol.rs	35.88%	61 / 170	164-166, 171-176, 178-193, 195-196, 203-208, 210-225, 227-228, 248-287, 308, 322-324, 369-374, 383-388, 444-469, 475-488, 520, 522
libcoap/src/resource.rs	70.49%	172 / 244	61, 93-95, 170-175, 182-207, 213-218, 248, 265-287, 299-302, 327-330, 363-372, 505-507
libcoap/src/session/client.rs	90.20%	138 / 153	164, 191, 223, 231-233, 239-241, 288-294
libcoap/src/session/mod.rs	39.64%	111 / 280	62-74, 105, 115-230, 240-285, 294-297, 306-317, 346, 350, 382-402, 424, 432, 464, 471, 489-495, 570, 576
libcoap/src/session/server.rs	82.05%	64 / 78	75-77, 81, 152, 162-164, 179, 194-200
libcoap/src/transport.rs	70.97%	22 / 31	29-36, 55
libcoap/src/types.rs	55.60%	313 / 563	71-125, 131-160, 210-223, 241-243, 253-265, 272-278, 284-286, 295, 562, 571, 583, 610, 636-705, 758, 803-824, 845-847, 863-868, 879-964
libcoap/tests/common/dtls.rs	94.34%	50 / 53	49, 54-55
libcoap/tests/common/mod.rs	93.68%	89 / 95	85-88, 92, 126
libcoap/tests/dtls_pki_client_server_test.rs	100.00%	82 / 82
libcoap/tests/dtls_psk_client_server_test.rs	100.00%	26 / 26
libcoap/tests/dtls_rpk_client_server_test.rs	100.00%	7 / 7
libcoap/tests/tcp_client_server_test.rs	100.00%	22 / 22
libcoap/tests/udp_client_server_test.rs	100.00%	22 / 22

Total coverage: 54.24%

[JKRhb]

Just stumbled upon two tiny spots, otherwise LGTM :)

[pulsastrix]

I'll leave this comment here to make sure that we don't merge this until the required changes to wolfssl-sys have been upstreamed.

See expressvpn/wolfssl-rs#225.