sd-network: add new library

This is similar to sd-login, but exposes the state of networkd rather than logind.

Include it in libsystemd-dhcp and rename it to libsystemd-network.

1 files changed, 378 insertions, 0 deletions

diff --git a/src/libsystemd-network/test-dhcp-option.c b/src/libsystemd-network/test-dhcp-option.c
new file mode 100644
index 0000000000..8659fd5025
--- /dev/null
+++ b/src/libsystemd-network/test-dhcp-option.c
@@ -0,0 +1,378 @@
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <string.h>
+#include <assert.h>
+
+#include "util.h"
+#include "macro.h"
+
+#include "dhcp-protocol.h"
+#include "dhcp-internal.h"
+
+struct option_desc {
+        uint8_t sname[64];
+        int snamelen;
+        uint8_t file[128];
+        int filelen;
+        uint8_t options[128];
+        int len;
+        bool success;
+        int filepos;
+        int snamepos;
+        int pos;
+};
+
+static bool verbose = false;
+
+static struct option_desc option_tests[] = {
+        { {}, 0, {}, 0, { 42, 5, 65, 66, 67, 68, 69 }, 7, false, },
+        { {}, 0, {}, 0, { 42, 5, 65, 66, 67, 68, 69, 0, 0,
+                          DHCP_OPTION_MESSAGE_TYPE, 1, DHCP_ACK }, 12, true, },
+        { {}, 0, {}, 0, { 8, 255, 70, 71, 72 }, 5, false, },
+        { {}, 0, {}, 0, { 0x35, 0x01, 0x05, 0x36, 0x04, 0x01, 0x00, 0xa8,
+                          0xc0, 0x33, 0x04, 0x00, 0x01, 0x51, 0x80, 0x01,
+                          0x04, 0xff, 0xff, 0xff, 0x00, 0x03, 0x04, 0xc0,
+                          0xa8, 0x00, 0x01, 0x06, 0x04, 0xc0, 0xa8, 0x00,
+                          0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, },
+          40, true, },
+        { {}, 0, {}, 0, { DHCP_OPTION_MESSAGE_TYPE, 1, DHCP_OFFER,
+                          42, 3, 0, 0, 0 }, 8, true, },
+        { {}, 0, {}, 0, { 42, 2, 1, 2, 44 }, 5, false, },
+
+        { {}, 0,
+          { 222, 3, 1, 2, 3, DHCP_OPTION_MESSAGE_TYPE, 1, DHCP_NAK }, 8,
+          { DHCP_OPTION_OVERLOAD, 1, DHCP_OVERLOAD_FILE }, 3, true, },
+
+        { { 1, 4, 1, 2, 3, 4, DHCP_OPTION_MESSAGE_TYPE, 1, DHCP_ACK }, 9,
+          { 222, 3, 1, 2, 3 }, 5,
+          { DHCP_OPTION_OVERLOAD, 1,
+            DHCP_OVERLOAD_FILE|DHCP_OVERLOAD_SNAME }, 3, true, },
+};
+
+static const char *dhcp_type(int type)
+{
+        switch(type) {
+        case DHCP_DISCOVER:
+                return "DHCPDISCOVER";
+        case DHCP_OFFER:
+                return "DHCPOFFER";
+        case DHCP_REQUEST:
+                return "DHCPREQUEST";
+        case DHCP_DECLINE:
+                return "DHCPDECLINE";
+        case DHCP_ACK:
+                return "DHCPACK";
+        case DHCP_NAK:
+                return "DHCPNAK";
+        case DHCP_RELEASE:
+                return "DHCPRELEASE";
+        default:
+                return "unknown";
+        }
+}
+
+static void test_invalid_buffer_length(void)
+{
+        DHCPMessage message;
+
+        assert_se(dhcp_option_parse(&message, 0, NULL, NULL) == -EINVAL);
+        assert_se(dhcp_option_parse(&message, sizeof(DHCPMessage), NULL, NULL)
+               == -EINVAL);
+}
+
+static void test_cookie(void)
+{
+        _cleanup_free_ DHCPMessage *message;
+        size_t len = sizeof(DHCPMessage) + 4;
+        uint8_t *opt;
+
+        message = malloc0(len);
+
+        opt = (uint8_t *)(message + 1);
+        opt[0] = 0xff;
+
+        assert_se(dhcp_option_parse(message, len, NULL, NULL) == -EINVAL);
+
+        opt[0] = 99;
+        opt[1] = 130;
+        opt[2] = 83;
+        opt[3] = 99;
+
+        assert_se(dhcp_option_parse(message, len, NULL, NULL) == -ENOMSG);
+}
+
+static DHCPMessage *create_message(uint8_t *options, uint16_t optlen,
+                uint8_t *file, uint8_t filelen,
+                uint8_t *sname, uint8_t snamelen)
+{
+        DHCPMessage *message;
+        size_t len = sizeof(DHCPMessage) + 4 + optlen;
+        uint8_t *opt;
+
+        message = malloc0(len);
+        opt = (uint8_t *)(message + 1);
+
+        opt[0] = 99;
+        opt[1] = 130;
+        opt[2] = 83;
+        opt[3] = 99;
+
+        if (options && optlen)
+                memcpy(&opt[4], options, optlen);
+
+        if (file && filelen <= 128)
+                memcpy(&message->file, file, filelen);
+
+        if (sname && snamelen <= 64)
+                memcpy(&message->sname, sname, snamelen);
+
+        return message;
+}
+
+static void test_ignore_opts(uint8_t *descoption, int *descpos, int *desclen)
+{
+        while (*descpos < *desclen) {
+                switch(descoption[*descpos]) {
+                case DHCP_OPTION_PAD:
+                        *descpos += 1;
+                        break;
+
+                case DHCP_OPTION_MESSAGE_TYPE:
+                case DHCP_OPTION_OVERLOAD:
+                        *descpos += 3;
+                        break;
+
+                default:
+                        return;
+                }
+        }
+}
+
+static int test_options_cb(uint8_t code, uint8_t len, const uint8_t *option,
+                           void *user_data)
+{
+        struct option_desc *desc = user_data;
+        uint8_t *descoption = NULL;
+        int *desclen = NULL, *descpos = NULL;
+        uint8_t optcode = 0;
+        uint8_t optlen = 0;
+        uint8_t i;
+
+        assert_se((!desc && !code && !len) || desc);
+
+        if (!desc)
+                return -EINVAL;
+
+        assert_se(code != DHCP_OPTION_PAD);
+        assert_se(code != DHCP_OPTION_END);
+        assert_se(code != DHCP_OPTION_MESSAGE_TYPE);
+        assert_se(code != DHCP_OPTION_OVERLOAD);
+
+        while (desc->pos >= 0 || desc->filepos >= 0 || desc->snamepos >= 0) {
+
+                if (desc->pos >= 0) {
+                        descoption = &desc->options[0];
+                        desclen = &desc->len;
+                        descpos = &desc->pos;
+                } else if (desc->filepos >= 0) {
+                        descoption = &desc->file[0];
+                        desclen = &desc->filelen;
+                        descpos = &desc->filepos;
+                } else if (desc->snamepos >= 0) {
+                        descoption = &desc->sname[0];
+                        desclen = &desc->snamelen;
+                        descpos = &desc->snamepos;
+                }
+
+                assert_se(descoption && desclen && descpos);
+
+                if (*desclen)
+                        test_ignore_opts(descoption, descpos, desclen);
+
+                if (*descpos < *desclen)
+                        break;
+
+                if (*descpos == *desclen)
+                        *descpos = -1;
+        }
+
+        assert_se(descpos);
+        assert_se(*descpos != -1);
+
+        optcode = descoption[*descpos];
+        optlen = descoption[*descpos + 1];
+
+        if (verbose)
+                printf("DHCP code %2d(%2d) len %2d(%2d) ", code, optcode,
+                                len, optlen);
+
+        assert_se(code == optcode);
+        assert_se(len == optlen);
+
+        for (i = 0; i < len; i++) {
+
+                if (verbose)
+                        printf("0x%02x(0x%02x) ", option[i],
+                                        descoption[*descpos + 2 + i]);
+
+                assert_se(option[i] == descoption[*descpos + 2 + i]);
+        }
+
+        if (verbose)
+                printf("\n");
+
+        *descpos += optlen + 2;
+
+        test_ignore_opts(descoption, descpos, desclen);
+
+        if (desc->pos != -1 && desc->pos == desc->len)
+                desc->pos = -1;
+
+        if (desc->filepos != -1 && desc->filepos == desc->filelen)
+                desc->filepos = -1;
+
+        if (desc->snamepos != -1 && desc->snamepos == desc->snamelen)
+                desc->snamepos = -1;
+
+        return 0;
+}
+
+static void test_options(struct option_desc *desc)
+{
+        uint8_t *options = NULL;
+        uint8_t *file = NULL;
+        uint8_t *sname = NULL;
+        int optlen = 0;
+        int filelen = 0;
+        int snamelen = 0;
+        int buflen = 0;
+        _cleanup_free_ DHCPMessage *message;
+        int res;
+
+        if (desc) {
+                file = &desc->file[0];
+                filelen = desc->filelen;
+                if (!filelen)
+                        desc->filepos = -1;
+
+                sname = &desc->sname[0];
+                snamelen = desc->snamelen;
+                if (!snamelen)
+                        desc->snamepos = -1;
+
+                options = &desc->options[0];
+                optlen = desc->len;
+                desc->pos = 0;
+        }
+        message = create_message(options, optlen, file, filelen,
+                        sname, snamelen);
+
+        buflen = sizeof(DHCPMessage) + 4 + optlen;
+
+        if (!desc) {
+                assert_se((res = dhcp_option_parse(message, buflen,
+                                                test_options_cb,
+                                                NULL)) == -ENOMSG);
+        } else if (desc->success) {
+                assert_se((res = dhcp_option_parse(message, buflen,
+                                                test_options_cb,
+                                                desc)) >= 0);
+                assert_se(desc->pos == -1 && desc->filepos == -1 &&
+                                desc->snamepos == -1);
+        } else
+                assert_se((res = dhcp_option_parse(message, buflen,
+                                                test_options_cb,
+                                                desc)) < 0);
+
+        if (verbose)
+                printf("DHCP type %s\n", dhcp_type(res));
+}
+
+static uint8_t result[64] = {
+        'A', 'B', 'C', 'D',
+};
+
+static uint8_t options[64] = {
+        'A', 'B', 'C', 'D',
+        160, 2, 0x11, 0x12,
+        0,
+        31, 8, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
+        0,
+        55, 3, 0x51, 0x52, 0x53,
+        17, 7, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
+        255
+};
+
+static void test_option_set(void)
+{
+        size_t len, oldlen;
+        int pos, i;
+        uint8_t *opt;
+
+        assert_se(dhcp_option_append(NULL, NULL, 0, 0, NULL) == -EINVAL);
+
+        len = 0;
+        opt = &result[0];
+        assert_se(dhcp_option_append(&opt, NULL, 0, 0, NULL) == -EINVAL);
+        assert_se(opt == &result[0] && len == 0);
+
+        assert_se(dhcp_option_append(&opt, &len, DHCP_OPTION_PAD,
+                                  0, NULL) == -ENOBUFS);
+        assert_se(opt == &result[0] && len == 0);
+
+        opt = &result[4];
+        len = 1;
+        assert_se(dhcp_option_append(&opt, &len, DHCP_OPTION_PAD,
+                                    0, NULL) >= 0);
+        assert_se(opt == &result[5] && len == 0);
+
+        pos = 4;
+        len = 60;
+        while (pos < 64 && options[pos] != DHCP_OPTION_END) {
+                opt = &result[pos];
+                oldlen = len;
+
+                assert_se(dhcp_option_append(&opt, &len, options[pos],
+                                          options[pos + 1],
+                                          &options[pos + 2]) >= 0);
+
+                if (options[pos] == DHCP_OPTION_PAD) {
+                        assert_se(opt == &result[pos + 1]);
+                        assert_se(len == oldlen - 1);
+                        pos++;
+                } else {
+                        assert_se(opt == &result[pos + 2 + options[pos + 1]]);
+                        assert_se(len == oldlen - 2 - options[pos + 1]);
+                        pos += 2 + options[pos + 1];
+                }
+        }
+
+        for (i = 0; i < pos; i++) {
+                if (verbose)
+                        printf("%2d: 0x%02x(0x%02x)\n", i, result[i],
+                               options[i]);
+                assert_se(result[i] == options[i]);
+        }
+
+        if (verbose)
+                printf ("\n");
+}
+
+int main(int argc, char *argv[])
+{
+        unsigned int i;
+
+        test_invalid_buffer_length();
+        test_cookie();
+
+        test_options(NULL);
+
+        for (i = 0; i < ELEMENTSOF(option_tests); i++)
+                test_options(&option_tests[i]);
+
+        test_option_set();
+
+        return 0;
+}