1 bd3d9e54 2021-09-05 stsp /*
  2 bd3d9e54 2021-09-05 stsp  * Copyright (c) 2019 Ori Bernstein <ori@openbsd.org>
  3 bd3d9e54 2021-09-05 stsp  * Copyright (c) 2021 Stefan Sperling <stsp@openbsd.org>
  4 bd3d9e54 2021-09-05 stsp  *
  5 bd3d9e54 2021-09-05 stsp  * Permission to use, copy, modify, and distribute this software for any
  6 bd3d9e54 2021-09-05 stsp  * purpose with or without fee is hereby granted, provided that the above
  7 bd3d9e54 2021-09-05 stsp  * copyright notice and this permission notice appear in all copies.
  8 bd3d9e54 2021-09-05 stsp  *
  9 bd3d9e54 2021-09-05 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 10 bd3d9e54 2021-09-05 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 11 bd3d9e54 2021-09-05 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 12 bd3d9e54 2021-09-05 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 13 bd3d9e54 2021-09-05 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 14 bd3d9e54 2021-09-05 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 15 bd3d9e54 2021-09-05 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 16 bd3d9e54 2021-09-05 stsp  */
 17 bd3d9e54 2021-09-05 stsp 
 18 8a8621c2 2021-09-06 naddy #include <sys/types.h>
 19 bd3d9e54 2021-09-05 stsp 
 20 bd3d9e54 2021-09-05 stsp #include <ctype.h>
 21 bd3d9e54 2021-09-05 stsp #include <stdio.h>
 22 bd3d9e54 2021-09-05 stsp #include <stdlib.h>
 23 bd3d9e54 2021-09-05 stsp #include <string.h>
 24 bd3d9e54 2021-09-05 stsp 
 25 bd3d9e54 2021-09-05 stsp #include "got_error.h"
 26 bd3d9e54 2021-09-05 stsp #include "got_path.h"
 27 bd3d9e54 2021-09-05 stsp 
 28 bd3d9e54 2021-09-05 stsp #include "got_lib_gitproto.h"
 29 bd3d9e54 2021-09-05 stsp 
 30 bd3d9e54 2021-09-05 stsp #ifndef nitems
 31 bd3d9e54 2021-09-05 stsp #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
 32 bd3d9e54 2021-09-05 stsp #endif
 33 bd3d9e54 2021-09-05 stsp 
 34 bd3d9e54 2021-09-05 stsp static const struct got_error *
 35 bd3d9e54 2021-09-05 stsp tokenize_refline(char **tokens, char *line, int len, int maxtokens)
 36 bd3d9e54 2021-09-05 stsp {
 37 bd3d9e54 2021-09-05 stsp 	const struct got_error *err = NULL;
 38 bd3d9e54 2021-09-05 stsp 	char *p;
 39 bd3d9e54 2021-09-05 stsp 	size_t i, n = 0;
 40 bd3d9e54 2021-09-05 stsp 
 41 bd3d9e54 2021-09-05 stsp 	for (i = 0; i < maxtokens; i++)
 42 bd3d9e54 2021-09-05 stsp 		tokens[i] = NULL;
 43 bd3d9e54 2021-09-05 stsp 
 44 bd3d9e54 2021-09-05 stsp 	for (i = 0; n < len && i < maxtokens; i++) {
 45 bd3d9e54 2021-09-05 stsp 		while (isspace(*line)) {
 46 bd3d9e54 2021-09-05 stsp 			line++;
 47 bd3d9e54 2021-09-05 stsp 			n++;
 48 bd3d9e54 2021-09-05 stsp 		}
 49 bd3d9e54 2021-09-05 stsp 		p = line;
 50 bd3d9e54 2021-09-05 stsp 		while (*line != '\0' && n < len &&
 51 bd3d9e54 2021-09-05 stsp 		    (!isspace(*line) || i == maxtokens - 1)) {
 52 bd3d9e54 2021-09-05 stsp 			line++;
 53 bd3d9e54 2021-09-05 stsp 			n++;
 54 bd3d9e54 2021-09-05 stsp 		}
 55 bd3d9e54 2021-09-05 stsp 		tokens[i] = strndup(p, line - p);
 56 bd3d9e54 2021-09-05 stsp 		if (tokens[i] == NULL) {
 57 bd3d9e54 2021-09-05 stsp 			err = got_error_from_errno("strndup");
 58 bd3d9e54 2021-09-05 stsp 			goto done;
 59 bd3d9e54 2021-09-05 stsp 		}
 60 bd3d9e54 2021-09-05 stsp 		/* Skip \0 field-delimiter at end of token. */
 61 bd3d9e54 2021-09-05 stsp 		while (line[0] == '\0' && n < len) {
 62 bd3d9e54 2021-09-05 stsp 			line++;
 63 bd3d9e54 2021-09-05 stsp 			n++;
 64 bd3d9e54 2021-09-05 stsp 		}
 65 bd3d9e54 2021-09-05 stsp 	}
 66 bd3d9e54 2021-09-05 stsp 	if (i <= 2)
 67 bd3d9e54 2021-09-05 stsp 		err = got_error(GOT_ERR_BAD_PACKET);
 68 bd3d9e54 2021-09-05 stsp done:
 69 bd3d9e54 2021-09-05 stsp 	if (err) {
 70 bd3d9e54 2021-09-05 stsp 		int j;
 71 bd3d9e54 2021-09-05 stsp 		for (j = 0; j < i; j++) {
 72 bd3d9e54 2021-09-05 stsp 			free(tokens[j]);
 73 bd3d9e54 2021-09-05 stsp 			tokens[j] = NULL;
 74 bd3d9e54 2021-09-05 stsp 		}
 75 bd3d9e54 2021-09-05 stsp 	}
 76 bd3d9e54 2021-09-05 stsp 	return err;
 77 bd3d9e54 2021-09-05 stsp }
 78 bd3d9e54 2021-09-05 stsp 
 79 bd3d9e54 2021-09-05 stsp const struct got_error *
 80 bd3d9e54 2021-09-05 stsp got_gitproto_parse_refline(char **id_str, char **refname,
 81 bd3d9e54 2021-09-05 stsp     char **server_capabilities, char *line, int len)
 82 bd3d9e54 2021-09-05 stsp {
 83 bd3d9e54 2021-09-05 stsp 	const struct got_error *err = NULL;
 84 bd3d9e54 2021-09-05 stsp 	char *tokens[3];
 85 bd3d9e54 2021-09-05 stsp 
 86 35add24a 2021-10-08 thomas 	*id_str = NULL;
 87 35add24a 2021-10-08 thomas 	*refname = NULL;
 88 35add24a 2021-10-08 thomas 	/* don't reset *server_capabilities */
 89 35add24a 2021-10-08 thomas 
 90 bd3d9e54 2021-09-05 stsp 	err = tokenize_refline(tokens, line, len, nitems(tokens));
 91 bd3d9e54 2021-09-05 stsp 	if (err)
 92 bd3d9e54 2021-09-05 stsp 		return err;
 93 bd3d9e54 2021-09-05 stsp 
 94 bd3d9e54 2021-09-05 stsp 	if (tokens[0])
 95 bd3d9e54 2021-09-05 stsp 		*id_str = tokens[0];
 96 bd3d9e54 2021-09-05 stsp 	if (tokens[1])
 97 bd3d9e54 2021-09-05 stsp 		*refname = tokens[1];
 98 bd3d9e54 2021-09-05 stsp 	if (tokens[2]) {
 99 35add24a 2021-10-08 thomas 		if (*server_capabilities == NULL) {
100 35add24a 2021-10-08 thomas 			char *p;
101 35add24a 2021-10-08 thomas 			*server_capabilities = tokens[2];
102 35add24a 2021-10-08 thomas 			p = strrchr(*server_capabilities, '\n');
103 35add24a 2021-10-08 thomas 			if (p)
104 35add24a 2021-10-08 thomas 				*p = '\0';
105 35add24a 2021-10-08 thomas 		} else
106 35add24a 2021-10-08 thomas 			free(tokens[2]);
107 bd3d9e54 2021-09-05 stsp 	}
108 bd3d9e54 2021-09-05 stsp 
109 bd3d9e54 2021-09-05 stsp 	return NULL;
110 bd3d9e54 2021-09-05 stsp }
111 bd3d9e54 2021-09-05 stsp 
112 bd3d9e54 2021-09-05 stsp static const struct got_error *
113 bd3d9e54 2021-09-05 stsp match_capability(char **my_capabilities, const char *capa,
114 bd3d9e54 2021-09-05 stsp     const struct got_capability *mycapa)
115 bd3d9e54 2021-09-05 stsp {
116 bd3d9e54 2021-09-05 stsp 	char *equalsign;
117 bd3d9e54 2021-09-05 stsp 	char *s;
118 bd3d9e54 2021-09-05 stsp 
119 bd3d9e54 2021-09-05 stsp 	equalsign = strchr(capa, '=');
120 bd3d9e54 2021-09-05 stsp 	if (equalsign) {
121 bd3d9e54 2021-09-05 stsp 		if (strncmp(capa, mycapa->key, equalsign - capa) != 0)
122 bd3d9e54 2021-09-05 stsp 			return NULL;
123 bd3d9e54 2021-09-05 stsp 	} else {
124 bd3d9e54 2021-09-05 stsp 		if (strcmp(capa, mycapa->key) != 0)
125 bd3d9e54 2021-09-05 stsp 			return NULL;
126 bd3d9e54 2021-09-05 stsp 	}
127 bd3d9e54 2021-09-05 stsp 
128 bd3d9e54 2021-09-05 stsp 	if (asprintf(&s, "%s %s%s%s",
129 bd3d9e54 2021-09-05 stsp 	    *my_capabilities != NULL ? *my_capabilities : "",
130 bd3d9e54 2021-09-05 stsp 	    mycapa->key,
131 bd3d9e54 2021-09-05 stsp 	    mycapa->value != NULL ? "=" : "",
132 e33e440b 2021-09-05 stsp 	    mycapa->value != NULL ? mycapa->value : "") == -1)
133 bd3d9e54 2021-09-05 stsp 		return got_error_from_errno("asprintf");
134 bd3d9e54 2021-09-05 stsp 
135 bd3d9e54 2021-09-05 stsp 	free(*my_capabilities);
136 bd3d9e54 2021-09-05 stsp 	*my_capabilities = s;
137 bd3d9e54 2021-09-05 stsp 	return NULL;
138 bd3d9e54 2021-09-05 stsp }
139 bd3d9e54 2021-09-05 stsp 
140 bd3d9e54 2021-09-05 stsp static const struct got_error *
141 bd3d9e54 2021-09-05 stsp add_symref(struct got_pathlist_head *symrefs, char *capa)
142 bd3d9e54 2021-09-05 stsp {
143 bd3d9e54 2021-09-05 stsp 	const struct got_error *err = NULL;
144 bd3d9e54 2021-09-05 stsp 	char *colon, *name = NULL, *target = NULL;
145 bd3d9e54 2021-09-05 stsp 
146 bd3d9e54 2021-09-05 stsp 	/* Need at least "A:B" */
147 bd3d9e54 2021-09-05 stsp 	if (strlen(capa) < 3)
148 bd3d9e54 2021-09-05 stsp 		return NULL;
149 bd3d9e54 2021-09-05 stsp 
150 bd3d9e54 2021-09-05 stsp 	colon = strchr(capa, ':');
151 bd3d9e54 2021-09-05 stsp 	if (colon == NULL)
152 bd3d9e54 2021-09-05 stsp 		return NULL;
153 bd3d9e54 2021-09-05 stsp 
154 bd3d9e54 2021-09-05 stsp 	*colon = '\0';
155 bd3d9e54 2021-09-05 stsp 	name = strdup(capa);
156 bd3d9e54 2021-09-05 stsp 	if (name == NULL)
157 bd3d9e54 2021-09-05 stsp 		return got_error_from_errno("strdup");
158 bd3d9e54 2021-09-05 stsp 
159 bd3d9e54 2021-09-05 stsp 	target = strdup(colon + 1);
160 bd3d9e54 2021-09-05 stsp 	if (target == NULL) {
161 bd3d9e54 2021-09-05 stsp 		err = got_error_from_errno("strdup");
162 bd3d9e54 2021-09-05 stsp 		goto done;
163 bd3d9e54 2021-09-05 stsp 	}
164 bd3d9e54 2021-09-05 stsp 
165 bd3d9e54 2021-09-05 stsp 	/* We can't validate the ref itself here. The main process will. */
166 bd3d9e54 2021-09-05 stsp 	err = got_pathlist_append(symrefs, name, target);
167 bd3d9e54 2021-09-05 stsp done:
168 bd3d9e54 2021-09-05 stsp 	if (err) {
169 bd3d9e54 2021-09-05 stsp 		free(name);
170 bd3d9e54 2021-09-05 stsp 		free(target);
171 bd3d9e54 2021-09-05 stsp 	}
172 bd3d9e54 2021-09-05 stsp 	return err;
173 bd3d9e54 2021-09-05 stsp }
174 bd3d9e54 2021-09-05 stsp 
175 bd3d9e54 2021-09-05 stsp const struct got_error *
176 bd3d9e54 2021-09-05 stsp got_gitproto_match_capabilities(char **common_capabilities,
177 bd3d9e54 2021-09-05 stsp     struct got_pathlist_head *symrefs, char *server_capabilities,
178 bd3d9e54 2021-09-05 stsp     const struct got_capability my_capabilities[], size_t ncapa)
179 bd3d9e54 2021-09-05 stsp {
180 bd3d9e54 2021-09-05 stsp 	const struct got_error *err = NULL;
181 bd3d9e54 2021-09-05 stsp 	char *capa, *equalsign;
182 bd3d9e54 2021-09-05 stsp 	size_t i;
183 bd3d9e54 2021-09-05 stsp 
184 bd3d9e54 2021-09-05 stsp 	*common_capabilities = NULL;
185 bd3d9e54 2021-09-05 stsp 	do {
186 bd3d9e54 2021-09-05 stsp 		capa = strsep(&server_capabilities, " ");
187 bd3d9e54 2021-09-05 stsp 		if (capa == NULL)
188 bd3d9e54 2021-09-05 stsp 			return NULL;
189 bd3d9e54 2021-09-05 stsp 
190 bd3d9e54 2021-09-05 stsp 		equalsign = strchr(capa, '=');
191 bd3d9e54 2021-09-05 stsp 		if (equalsign != NULL && symrefs != NULL &&
192 bd3d9e54 2021-09-05 stsp 		    strncmp(capa, "symref", equalsign - capa) == 0) {
193 bd3d9e54 2021-09-05 stsp 			err = add_symref(symrefs, equalsign + 1);
194 bd3d9e54 2021-09-05 stsp 			if (err)
195 bd3d9e54 2021-09-05 stsp 				break;
196 bd3d9e54 2021-09-05 stsp 			continue;
197 bd3d9e54 2021-09-05 stsp 		}
198 bd3d9e54 2021-09-05 stsp 
199 bd3d9e54 2021-09-05 stsp 		for (i = 0; i < ncapa; i++) {
200 bd3d9e54 2021-09-05 stsp 			err = match_capability(common_capabilities,
201 bd3d9e54 2021-09-05 stsp 			    capa, &my_capabilities[i]);
202 bd3d9e54 2021-09-05 stsp 			if (err)
203 bd3d9e54 2021-09-05 stsp 				break;
204 bd3d9e54 2021-09-05 stsp 		}
205 bd3d9e54 2021-09-05 stsp 	} while (capa);
206 bd3d9e54 2021-09-05 stsp 
207 bd3d9e54 2021-09-05 stsp 	if (*common_capabilities == NULL) {
208 bd3d9e54 2021-09-05 stsp 		*common_capabilities = strdup("");
209 bd3d9e54 2021-09-05 stsp 		if (*common_capabilities == NULL)
210 bd3d9e54 2021-09-05 stsp 			err = got_error_from_errno("strdup");
211 bd3d9e54 2021-09-05 stsp 	}
212 bd3d9e54 2021-09-05 stsp 	return err;
213 bd3d9e54 2021-09-05 stsp }